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TAO Sparse4D Model Card

Model Overview

Description:

TAO Sparse4D is an advanced three-dimensional (3D) multi-camera detection and tracking network. It generates precise 3D bounding boxes and tracking IDs for a diverse set of objects across multiple camera views. The model was developed by NVIDIA as a part of the TAO model family. The provided model is pre-trained on the Multi-Target Multi-Camera (MTMC) Tracking 2025 subset from the NVIDIA PhysicalAI-SmartSpaces dataset also utilized for the 2025 AI City Challenge. This model is ready for commercial use.

The model in this card was trained & evaluated on the following warehouse-centric classes: Person, Fourier_GR1_T2_Humanoid, Agility_Digit_Humanoid, Nova_Carter, Transporter and Forklift.

License/Terms of Use:

GOVERNING TERMS: Use of this model is governed by the NVIDIA Open Model License.

Deployment Geography:

Global\n

Use Case:

TAO Sparse4D is designed for 3D multi-camera object detection and tracking in indoor environments like warehouses and logistics facilities. The model detects & tracks objects across multiple camera views for applications including warehouse automation, safety and workflow optimization in industrial settings, providing spatial understanding of a scene.

Release Date:

v1.0 Model - NGC - 06/13/2025
\nv1.1 Model - NGC - 11/30/2025
\nv2.0 Model - NGC - 01/23/2026 via NGC
\nv2.1 Model - NGC - 02/27/2026 via NGC
\nv2.2 Model (ResNet50) - NGC - 05/12/2026 via NGC
\nv2.2 Model (ResNet101) - NGC - 05/12/2026 via NGC

References

Model Architecture

Architecture Type: Convolution Neural Network (CNN) based backbone with Transformer based decoder layers.

Network Architecture: ResNet101 backbone with Transformer based decoder layers.

Number of model parameters: 7.8 × 10⁷ parameters

This work leverages the Sparse4D v3 model & is tailored for indoor environments like warehouses with static camera setups. Sparse4D is a query based technique which involves sampling sparse features for better computational efficiency compared to other dense 3D detection & tracking based techniques. The architecture features a ResNet101 backbone and processes time-synchronized frames from multiple cameras. Key components include the backbone, a Feature Pyramid Network (FPN), and multiple decoder layers incorporating Multi-Scale Deformable Aggregation blocks (featuring key-point generation, feature sampling, visibility net module & embedding generation) along with refinement & classification layers. The model is trained on regression, classification & ID losses. The model also consists of an Instance Bank module utilized for tracking ID assignment & management. Along with the 3D bounding box information & object ID, Sparse4D also outputs an instance feature containing high-dimensional semantics from the image encoder. The training algorithm optimizes the network to minimize the classification loss, regression loss & ID loss.

Input:

Sparse4D is trained on RGB images, camera calibration files, ground truth 3D bounding boxes & object ids, and optional depth maps. Since performing 3D multi-camera detection and tracking across large regions like warehouses with high-density camera setups is computationally expensive, we partition large regions into overlapping groups called Bird's Eye View (BEV) group. Each BEV group contains multiple cameras and serves as the fundamental training unit for Sparse4D.

Input Type(s): Each BEV group will have cameras with RGB images, Camera calibration file, Ground Truth with 3D bounding boxes & Optional Depth Maps available via HuggingFace or generated synthetically by Nvidia Isaac Sim Replicator.

Input Format: Red, Green, Blue (RGB) images stored in raw png/jpg/hdf5 and Depth Maps stored in png/hdf5. Can support input resolution of 3 x 1080 x 1920 for both RGB & Depth Maps. Data preprocessing is required for grouping images & depth maps from multiple cameras to appropriate BEV groups. This can be done via the TAO Data Service.

Input Parameters: Multiple dimensions. See below for detailed model input shapes.

Other Properties Related to Input: 3 x 1080 x 1920 (C x H x W) resolution images for both RGB & Depth Maps. Data Pre-Processing needed via TAO Data Services. No alpha channel required.

Note that depth maps are optional and not required for evaluation or inference. The raw model inputs are as follows:

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Dimension	Description
`B`	Batch size
`C`	Number of channels
`N`	Number of cameras
`H`	Image height
`W`	Image width
`Q`	Number of queries
`M`	Number of output boxes
`E`	Number of instance features

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Input Name	Type	Shape	ResNet101 Shape	Description
`img`	List[Tensor]	(B, N, C, H, W)	(1, N, 3, 540, 960)	Input image tensor
`projection_mat`	List[Tensor]	(B, N, 4, 4)	(1, 10, 4, 4)	List of projection matrices
`image_wh`	List[Tensor]	(B, N, 2)	(1, 10, 2)	List of image width and height
`input_cached_feature`	List[Tensor]	(B, 600, 256)	(1, 600, 256)	List of cached features
`input_cached_anchor`	List[Tensor]	(B, 600, 11)	(1, 600, 11)	List of cached anchor
`prev_exists`	List[Tensor]	(B)	(1)	Indicates if previous frame exists or not
`interval_mask`	List[Tensor]	(Bx1x1)	(1x1x1)	Boolean to describe the interval mask

No. of cameras is dynamic in the model.
Model is initialized with zero tensors for the input_cached_feature, input_cached_anchor, prev_exists & interval_mask at the first frame. These tensors will be updated automatically via instance bank from the second frame & onwards.

Output:

Output Type(s): Tensors consisting of bounding boxes in 3D , object confidence scores, classes, class confidence scores, tracking object ID & instance features.

Output Format: List of Tensors.

Output Parameters: Multiple dimensions. See below for detailed model output shapes.

Other Properties Related to Output: Please see the details below.

The final output is a list with length of batch size after post-processing. Each element is a dictionary with the following keys:

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Output Name	Type	Shape	ResNet Shape	Description
`boxes_3d`	List[Tensor]	(B, M, 10)	(1, 600, 10)	List of 3D boxes: `(x, y, z, width, length, height, yaw, velocity_x, velocity_y, velocity_z)` in OV coordinates
`scores_3d`	List[Tensor]	(B, M)	(1, 600)	List of object confidence scores (classification scores * centerness score)
`labels_3d`	List[Tensor]	(B, M)	(1, 600)	List of class labels
`cls_scores`	List[Tensor]	(B, M)	(1, 600)	List of classification scores
`instance_ids`	List[Tensor]	(B, M)	(1, 600)	List of instance IDs
`instance_feats`	List[Tensor]	(B, M, E)	(1, 600, 256)	List of instance features

where:

x, y, z - 3D coordinates of the bounding-box centroid in the world coordinate system which is in meters.
width, length, height - Box dimensions in meters along its x (width), y (length) and z (height) axes of the object-centered coordinate system, with the origin at the centroid.
yaw - Euler angle in radians about the y-axis of the object-centered coordinate system defining the box’s heading in the world coordinate system. (Pitch and roll are assumed zero.)
velocity - 3D velocity vector components in meters per second (m/s) in the world coordinate system, representing the object's instantaneous motion along the x, y, and z axes respectively.

Our AI models are designed and/or optimized to run on NVIDIA GPU-accelerated systems. By leveraging NVIDIA’s hardware (e.g. GPU cores) and software frameworks (e.g., CUDA libraries), the model achieves faster training and inference times compared to CPU-only solutions.

Software Integration:

Runtime Engine(s):

DeepStream - 7.1
TAO - 6.1.0

Supported Hardware Microarchitecture Compatibility:

NVIDIA Blackwell
NVIDIA Hopper
NVIDIA Lovelace
NVIDIA Ampere

Preferred/Supported Operating Systems:

Linux

These models are designed for use with NVIDIA hardware and software. For hardware, the models are compatible with any NVIDIA DataCenter GPU. For software, the models are specifically designed for the TAO Toolkit.

Model versions (Latest):

trainable_v2.2 (ResNet50 / ResNet101) - Pre-trained model for Sparse4D.
deployable_v2.2 (ResNet50 / ResNet101) - Model for Sparse4D deployable to DeepStream or TensorRT.

Training, Testing, and Evaluation Datasets

Dataset Overview

** Total Size:

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Subset	No. of scenes	No. BEV groups	No. of objects per scene	No. of cameras per scene	Duration of each camera sequence	FPS
Train	90	3469	1-120	1-20	5 mins	30 FPS

** Total Number of Datasets: 3 Datasets in total including (MTMC Tracking 2025 and COSMOS augmented version of the MTMC Tracking 2025 dataset, SCOUT dataset)

** Dataset partition: Training 80%, Testing 10%, Validation 10%
\n** Time period for training data collection: Collected throughout the year 2024-2025.
\n** Time period for testing data collection Collected throughout the year 2024-2025.
\n** Time period for validation data collection Collected throughout the year 2024-2025.

The model is trained on the MTMC Tracking 2025 dataset available on HuggingFace.

Data Format & Preprocessing

Raw Data (MTMC Tracking 2025/AI City Challenge Format)

This raw data includes .mp4 RGB video files, depth maps stored in HDF5 format, ground_truth.json, calibration.json & map.png. For more details on these files including the ground truth format please refer to the raw dataset format here.

The raw data may also be obtained from Nvidia Isaac Sim Replicator Agent IRA. When collected via this route, RGB image data & depth maps can be in frame output/HDF5 output. Utilize the TAO Data Service to convert your raw data format (AICity) to pickle format (OVPKL) accordingly.

Pickle File Structure (OVPKL format)

The above raw data format needs to be converted to a pickle files for model training via the TAO DataService. The model will utilize these pickle files along with the above files for training. An example command can be found in the sparse4d finetuning notebook. The pickle file will consist of the items.

The process generates pickle files (.pkl) containing scene information. Each pickle file is a dictionary with the following top-level keys:

metadata: (dict) Contains metadata about the dataset.
infos: (list) A list of dictionaries, where each dictionary contains information about a specific frame in the scene.

`metadata` key

The metadata dictionary contains the following keys:

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Key	Type	Description	Example Value
`version`	`str`	Version of the dataset or split.	`'trainval_split'`
`split_type`	`str`	Type of data split (e.g., 'all', 'train', 'validation').	`'all'`

`infos` key

The infos key holds a list of dictionaries. Each dictionary in this list corresponds to a frame and contains the following keys:

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Key	Type	Description	Example Value (Illustrative)
`frame_idx`	`int`	Index of the frame.	`0`
`cams`	`dict`	Dictionary containing data for each camera in the frame. Keys are camera names (e.g., `'Camera'`, `'Camera_01'`).	See cams Structure below.
`scene_name`	`str`	Name of the scene.	`'Warehouse_014+bev-sensor-training-1'`
`timestamp`	`float`	Timestamp of the frame.	`0.0`
`token`	`str`	Unique token for the frame.	`'Warehouse_014+bev-sensor-training-1__000000000'`
`group_name`	`str`	Name of the group this frame belongs to.	`'bev-sensor-training-1'`
`instance_inds`	`np.ndarray`	Array of instance indices present in the frame.	`array([372, 171, 172, 631, 663])`
`asset_inds`	`np.ndarray`	Array of asset indices corresponding to instances.	`array([ 771, 772, 775, 2094, 1372])`
`gt_boxes`	`np.ndarray`	Ground truth bounding boxes for objects in the frame. Shape: (N, 7) where N is the number of objects. Each row is `[x, y, z, dx, dy, dz, heading]`.	`array([[-0.686, 1.073, ..., -0. ], ...])`
`gt_names`	`np.ndarray`	Array of ground truth names for objects.	`array(['agility_digit', 'gr1_t2', ...], dtype='<U18')`
`gt_velocity`	`np.ndarray`	Ground truth velocity for objects. Shape: (N, 3) for `[vx, vy, vz]`.	`array([[0., 0., 0.], ...])`
`valid_flag`	`np.ndarray`	Boolean array indicating if the ground truth data for each object is valid.	`array([ True, True, ...])`
`gt_visibility`	`list`	List of dictionaries, one for each ground truth object, indicating its visibility percentage in each camera.	`[{'Camera': 1.0, 'Camera_01': 1.0, ...}, ...]`

`cams` Structure

The cams dictionary (within each element of the infos list) contains nested dictionaries, where each key is a camera identifier (e.g., 'Camera', 'Camera_01', etc.). Each of these camera-specific dictionaries has the following structure:

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Key	Type	Description	Example Value (Illustrative)
`data_path`	`tuple`	Tuple containing paths to camera data. `(h5_file_path, rgb_image_relative_path)`	`('data/mtmc/Warehouse_014/Camera.h5', 'rgb/rgb_00000.jpg')`
`depth_map_path`	`tuple`	Tuple containing paths to depth map data. `(h5_file_path, depth_image_relative_path)`	`('data/mtmc/Warehouse_014/Camera.h5', 'distance_to_image_plane_png/distance_to_image_plane_00000.png')`
`sample_data_token`	`str`	Unique token for the sample data from this camera.	`'Warehouse_014+bev-sensor-training-1__000000000+Camera'`
`cam_intrinsic`	`np.ndarray`	3x3 camera intrinsic matrix.	`array([[916.249, 0., 960.], [0., 916.249, 540.], [0., 0., 1.]])`
`sensor2world_transform`	`np.ndarray`	4x4 transformation matrix from sensor coordinates to world coordinates.	`array([[0.018, -0.999, ..., -4.731], ..., [0., 0., 0., 1.]])`

3D bounding box information is transformed from OV coordinates to BEV coordiantes for faster convergence during training. During inference, results are converted back to OV world coordinates.

Public Datasets

MTMC Tracking 2025 Subset from NVIDIA PhysicalAI-SmartSpaces dataset

Private Datasets

NVIDIA COSMOS-augmented version of the MTMC Tracking 2025 dataset was used for training to improve data diversity and robustness across varying scenarios.

Self-Sourced Synthetic Data

Overall Size per Modality: 80% of the overall data used for training was synthetic data collected from NVIDIA Isaac Sim Replicator.
A description of the methods used to synthetically generate training data: Various warehouse related assets were imported in a scene with virtual cameras recording image data.

Training Data

The dataset statistics used for pretraining the model are as follows:

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Data Modality - Image
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Image Training Data Size - 1 Million to 1 Billion Images
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Data Collection Method by dataset - Synthetic
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Labeling Method by dataset - Synthetic
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Properties (Quantity, Dataset Descriptions, Sensor(s)):

Please see above.

Model was trained on the following moving object classes: Person, Fourier_GR1_T2_Humanoid, Agility_Digit_Humanoid, Nova_Carter, Transporter and Forklift.
Both validation & testing was conduction on random scenes from the MTMC Tracking 2025 subset.

Testing and Evaluation Datasets

Both validation & testing was conduction on random scenes from the MTMC Tracking 2025 subset.

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Data Collection Method by dataset - Synthetic
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Labeling Method by dataset - Synthetic
\n

Properties (Quantity, Dataset Descriptions, Sensor(s)):\nWe utilize a random scenes from the test set of the MTMC Tracking 2025 subset.

Methodology and KPI

The key performance indicator is Higher Order Tracking Accuracy (HOTA) per-class and the average HOTA obtained across all classes. We utilize the HOTA evaluation methodology to assess multi-object tracking accuracy.

Higher Order Tracking Accuracy (HOTA) is a metric that balances detection accuracy and association accuracy into a single unified score. It decomposes tracking performance into Detection Accuracy (DetA), which measures how well objects are localized, and Association Accuracy (AssA), which measures how well detections are linked over time into consistent tracks. HOTA is computed as the geometric mean of DetA and AssA, averaged over a range of localization thresholds. This provides a balanced, holistic measure of tracking quality that captures both spatial accuracy and temporal consistency.

The following scores are for v2.2 models trained on MTMC Tracking 2025 subset. The evaluation set and training set is disjoint.

ResNet50 backbone (v2.2)

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Object Class	HOTA	DetA	AssA	LocA
`Person`	53.93	59.13	49.54	73.34
`Fourier_GR1_T2_Humanoid`	59.31	59.87	58.84	73.46
`Agility_Digit_Humanoid`	52.69	52.57	53.50	70.72
`Nova_Carter`	58.26	56.89	59.92	71.05
`Transporter`	33.70	38.98	31.49	68.41
`Forklift`	48.05	43.84	54.97	66.69
Average	50.99	51.88	51.37	70.61

ResNet101 backbone (v2.2)

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Object Class	HOTA	DetA	AssA	LocA
`Person`	57.96	58.99	57.11	73.29
`Fourier_GR1_T2_Humanoid`	60.93	60.97	60.98	74.00
`Agility_Digit_Humanoid`	54.00	53.32	55.32	71.02
`Nova_Carter`	54.85	57.60	53.28	70.92
`Transporter`	33.98	38.13	32.58	67.33
`Forklift`	48.05	43.78	55.20	66.45
Average	51.63	52.13	52.41	70.50

Real-time Inference Performance

Inference runs through the DeepStream pipeline on TensorRT with mixed precision (FP16+FP32). The TensorRT columns capture model-only latency, while the DeepStream columns add the instance-bank pre- and post-processing overhead. The table summarizes how many cameras each GPU supports at 30, 15, and 10 FPS for the v2.0 model. Numbers in bold are measured (all TensorRT values and certain DeepStream values). DeepStream values not in bold are estimates based on the guidance that the DS microservice adds approximately 30% overhead over Sparse4D TensorRT model performance.

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n

tr:nth-child(odd)]:bg-surface-sunken\">

GPU	TensorRT @30 FPS	DeepStream @30 FPS	TensorRT @15 FPS	DeepStream @15 FPS	TensorRT @10 FPS	DeepStream @10 FPS
1 x A100-SXM4-80GB	13	9	28	19	43	30
1 x B200	75	52	155	108	200	140
1 x GB200	101	70	200	140	200	140
1 x H100 NVL - 94GB	23	16	48	33	72	50
1 x H100 SXM HBM3 - 80GB	28	19	58	40	89	62
1 x H200	32	22	67	46	103	72
1 x L4 - 24GB	3	2	6	4	9	6
1 x L40	8	5	16	11	26	18
1 x L40S - 48GB	9	6	20	14	30	21
1 x RTX 6000 ADA	9	6	19	13	27	18
1 x RTX PRO 6000 Blackwell (Server)	28	19	58	40	89	62
1 x RTX PRO 6000 Blackwell (Workstation)	29	20	59	41	90	63
1 x IGX Thor - T7000 iGPU (no dGPU)	5	3	11	7	17	11
1 x IGX Thor - T7000 dGPU - RTX PRO 6000 Blackwell Max-Q Workstation Edition	21	14	30	21	30	21
1 x AGX Thor - T5000	4	2	8	5	14	9
1 x DGX Spark	5	3	11	7	17	11

Changelog

v2.2

Released two backbone variants of the same recipe: ResNet50 (lower latency / smaller footprint) and ResNet101 (high accuracy), shipped under sparse4d_rn50 and sparse4d_rn101 NGC model cards respectively.
The ResNet50 variant is built on top of an RT-DETR R50 pre-training initialization for stronger image features at half the backbone cost.
Added pallet_truck to the trained class set (person, gr1_t2, agility_digit, nova_carter, transporter, forklift, pallet_truck).
Expanded the training corpus to all available MTMC Tracking 2025 scenes (lazy-loaded), 3K+ BEV groups, and refreshed COSMOS-augmented data; mixed FPS training is unchanged.
Refreshed kmeans anchor priors per backbone (_ov_kmeans900_v2.2_r50.npy, _ov_kmeans900_v2.2_r101.npy).

v2.1

Trained on a significantly expanded dataset: more synthetic environments (retail, hospital, supermarket), GTC'24 warehouse data, COSMOS-transferred data with BEV groups, and real-world SCOUT data.
Leverages the upgraded camera grouping algorithm (SDU v1.2).
Corrected forklift orientation annotations.

v2.0

Increased the number of BEV groups to 1337 to improve accuracy across all benchmarks.
Added COSMOS-augmented datasets to the training set, using an 80:20 split between synthetic data and COSMOS augmentations.
Introduced multiple FPS settings in training to better handle low-frame-rate streams (1, 2, 3, 5, 6, 10, 15, and 30 FPS).
Increased the regression weight for rotation loss to improve bounding box fitting accuracy.

v1.1

Updated input image resolution to 960×540 and introduced camera embeddings to lift maximum camera limits.
Expanded training set to 34 scenes spanning 500+ cameras and 380 BEV groups (1–18 cameras each).
Supported classes: Person, Fourier_GR1_T2_Humanoid, Agility_Digit_Humanoid, Nova_Carter, Transporter, Forklift.
Mixed input frame rates (10, 15, 30 FPS) to improve robustness to lower streaming FPS.
Enabled sparser camera grouping with random frame dropping to mirror Data Service frame-loss scenarios.
Fixed rotation bug in object annotations and retrained the model with corrected labels.
New MSDA FP16 Kernel which helps improve throughput by ~1.5x-2x for Data Center GPUs available in the DeepStream Pipeline inside the Nvidia Video Search and Summarization (VSS) - Warehouse Blueprint release.

v1.0

First commercial warehouse-focused 3D detection and tracking release.
Input image resolution: 1408×512 and cameras limited to 20.
Supported classes: Person, Fourier_GR1_T2_Humanoid, Agility_Digit_Humanoid, Nova_Carter.

How to use this model

In order to use the model as pre-trained weights for transfer learning, please use the snippet below as a template for the model component of the experiment spec file to train a Sparse4D. For more information on experiment spec file, please refer to the Train Adapt Optimize (TAO) Toolkit User Guide.

model:\n  type: \"sparse4d\"\n  use_grid_mask: true\n  use_deformable_func: true\n  use_temporal_align: true\n  input_shape: [960, 540]\n  embed_dims: 256\n  neck:\n    type: \"FPN\"\n    num_outs: 4\n    start_level: 0\n    out_channels: 256\n    in_channels: [256, 512, 1024, 2048]\n    add_extra_convs: \"on_output\"\n    relu_before_extra_convs: true\n  depth_branch:\n    type: \"dense_depth\"\n    embed_dims: \"${model.embed_dims}\"\n    num_depth_layers: 3\n    loss_weight: 0.2\n  head:\n    type: \"sparse4d\"\n    num_output: 300\n    cls_threshold_to_reg: 0.05\n    decouple_attn: true\n    return_feature: true\n    use_reid_sampling: false\n    embed_dims: \"${model.embed_dims}\"\n    num_groups: 8\n    num_decoder: 6\n    num_single_frame_decoder: 1\n    drop_out: 0.1\n    temporal: true\n    with_quality_estimation: true\n    instance_bank:\n      num_anchor: 900\n      anchor: ???\n      num_temp_instances: 600\n      confidence_decay: 0.8\n      feat_grad: false\n      default_time_interval: 0.033333\n      embed_dims: \"${model.embed_dims}\"\n      use_temporal_align: \"${model.use_temporal_align}\"\n    anchor_encoder:\n      type: 'SparseBox3DEncoder'\n      vel_dims: 3\n      embed_dims: [128, 32, 32, 64]\n      mode: 'cat'\n      output_fc: false\n      in_loops: 1\n      out_loops: 4\n    operation_order: [\n      \"deformable\", \"ffn\", \"norm\", \"refine\", \"temp_gnn\", \"gnn\", \"norm\", \n      \"deformable\", \"ffn\", \"norm\", \"refine\", \"temp_gnn\", \"gnn\", \"norm\", \n      \"deformable\", \"ffn\", \"norm\", \"refine\", \"temp_gnn\", \"gnn\", \"norm\", \n      \"deformable\", \"ffn\", \"norm\", \"refine\", \"temp_gnn\", \"gnn\", \"norm\", \n      \"deformable\", \"ffn\", \"norm\", \"refine\", \"temp_gnn\", \"gnn\", \"norm\", \n      \"deformable\", \"ffn\", \"norm\", \"refine\"\n    ]\n    temp_graph_model:\n      type: \"MultiheadAttention\"\n      embed_dims: 512\n      num_heads: 8\n      batch_first: true\n      dropout: 0.1\n    graph_model:\n      type: \"MultiheadAttention\"\n      embed_dims: \"${model.head.temp_graph_model.embed_dims}\"\n      num_heads: \"${model.head.temp_graph_model.num_heads}\"\n      batch_first: true\n      dropout: \"${model.head.temp_graph_model.dropout}\"\n    norm_layer:\n      type: \"LN\"\n      normalized_shape: \"${model.embed_dims}\"\n    ffn:\n      type: \"AsymmetricFFN\"\n      in_channels: 512\n      pre_norm:\n        type: \"LN\"\n      embed_dims: 256\n      feedforward_channels: 1024\n      num_fcs: 2\n      ffn_drop: 0.1\n      act_cfg:\n        type: \"ReLU\"\n        inplace: true\n    deformable_model:\n      embed_dims: \"${model.embed_dims}\"\n      num_groups: 8\n      num_levels: 4\n      attn_drop: 0.15\n      use_deformable_func: true\n      use_camera_embed: true\n      residual_mode: \"cat\"\n      kps_generator:\n        embed_dims: \"${model.embed_dims}\"\n        num_learnable_pts: 6\n        fix_scale:\n          - [0, 0, 0]\n          - [0.45, 0, 0]\n          - [-0.45, 0, 0]\n          - [0, 0.45, 0]\n          - [0, -0.45, 0]\n          - [0, 0, 0.45]\n          - [0, 0, -0.45]\n    refine_layer:\n      type: \"SparseBox3DRefinementModule\"\n      embed_dims: \"${model.embed_dims}\"\n      refine_yaw: true\n      with_quality_estimation: true\n    sampler:\n      num_dn_groups: 5\n      num_temp_dn_groups: 3\n      dn_noise_scale: [2.0, 2.0, 2.0, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5]\n      max_dn_gt: 128\n      add_neg_dn: true\n      cls_weight: 2.0\n      box_weight: 0.25\n      reg_weights: [2.0, 2.0, 2.0, 0.5, 0.5, 0.5, 0.0, 0.0, 0.0, 0.0, 0.0]\n      use_temporal_align: \"${model.use_temporal_align}\"\n    visibility_net:\n      type: \"visibility_net\"\n      embedding_dim: 256\n      hidden_channels: 32\n    loss:\n      reg:\n        type: \"sparse_box_3d\"\n        box_weight: 0.25\n        cls_allow_reverse: [5, 6, 7]\n      cls:\n        type: \"focal\"\n        use_sigmoid: true\n        gamma: 2.0\n        alpha: 0.25\n        loss_weight: 2.0\n      id:\n        type: \"cross_entropy_label_smooth\"\n        num_ids: \"${dataset.num_ids}\"\n    bnneck:\n      type: \"bnneck\"\n      feat_dim: 256\n      num_ids: \"${dataset.num_ids}\"\n    decoder:\n      type: \"SparseBox3DDecoder\"\n      score_threshold: 0.05\n    reg_weights: [2.0, 2.0, 2.0, 1 ,1, 1, 1, 1, 1, 1, 1]\n\n

Inference & Deployment:

For deployment of this model, please refer to the our Nvidia Video Search and Summarization (VSS) - Warehouse Blueprint release documentation.

Acceleration Engine: Tensor(RT)

Test Hardware:

NVIDIA Datacenter GPUs

Ethical Considerations

NVIDIA believes Trustworthy AI is a shared responsibility and we have established policies and practices to enable development for a wide array of AI applications. When downloaded or used in accordance with our terms of service, developers should work with their internal model team to ensure this model meets requirements for the relevant industry and use case and addresses unforeseen product misuse.

Please make sure you have proper rights and permissions for all input image and video content; if image or video includes people, personal health information, or intellectual property, the image or video generated will not blur or maintain proportions of image subjects included.

For more detailed information on ethical considerations for this model, please see the Model Card++ Explainability, Bias, Safety & Security, and Privacy Sub-cards.

Please report model quality, risk, security vulnerabilities or NVIDIA AI Concerns here.

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\n\nThe model in this card was trained & evaluated on the following warehouse-centric classes: `Person`, `Fourier_GR1_T2_Humanoid`, `Agility_Digit_Humanoid`, `Nova_Carter`, `Transporter` and `Forklift`.\n\n### License/Terms of Use: \n\nGOVERNING TERMS: Use of this model is governed by the [NVIDIA Open Model License](https://www.nvidia.com/en-us/agreements/enterprise-software/nvidia-open-model-license/).\n\n### Deployment Geography:\nGlobal\n
\n\n### Use Case:
\nTAO Sparse4D is designed for 3D multi-camera object detection and tracking in indoor environments like warehouses and logistics facilities. The model detects & tracks objects across multiple camera views for applications including warehouse automation, safety and workflow optimization in industrial settings, providing spatial understanding of a scene.\n\n\n### Release Date:
\nv1.0 Model - NGC - 06/13/2025
\nv1.1 Model - NGC - 11/30/2025
\nv2.0 Model - NGC - 01/23/2026 via [NGC](https://catalog.ngc.nvidia.com/orgs/nvidia/teams/tao/models/sparse4d_rn101/files?version=deployable_v2.0)
\nv2.1 Model - NGC - 02/27/2026 via [NGC](https://catalog.ngc.nvidia.com/orgs/nvidia/teams/tao/models/sparse4d_rn101/files?version=deployable_v2.1)
\nv2.2 Model (ResNet50) - NGC - 05/12/2026 via [NGC](https://catalog.ngc.nvidia.com/orgs/nvidia/teams/tao/models/sparse4d_rn50/files?version=deployable_v2.2)
\nv2.2 Model (ResNet101) - NGC - 05/12/2026 via [NGC](https://catalog.ngc.nvidia.com/orgs/nvidia/teams/tao/models/sparse4d_rn101/files?version=deployable_v2.2)
\n\n\n## References \n\n- [Wang, Y., Pusegaonkar, S., Wang, Y., Li, A., Kumar, V., Sethi, C., ... & Biswas, S. (2026). A Unified 3D Object Perception Framework for Real-Time Outside-In Multi-Camera Systems. arXiv preprint arXiv:2601.10819.](https://arxiv.org/abs/2601.10819)\n- [Lin, X., Pei, Z., Lin, T., Huang, L., & Su, Z. (2023). Sparse4d v3: Advancing end-to-end 3d detection and tracking. arXiv preprint arXiv:2311.11722.](https://arxiv.org/abs/2311.11722)\n\n\n## Model Architecture \n\n**Architecture Type:** Convolution Neural Network (CNN) based backbone with Transformer based decoder layers.
\n\n**Network Architecture:** ResNet101 backbone with Transformer based decoder layers.
\n\n**Number of model parameters:** 7.8 × 10⁷ parameters\n\nThis work leverages the [Sparse4D v3 model](https://arxiv.org/abs/2311.11722) & is tailored for indoor environments like warehouses with static camera setups. Sparse4D is a query based technique which involves sampling sparse features for better computational efficiency compared to other dense 3D detection & tracking based techniques. The architecture features a ResNet101 backbone and processes time-synchronized frames from multiple cameras. Key components include the backbone, a Feature Pyramid Network (FPN), and multiple decoder layers incorporating Multi-Scale Deformable Aggregation blocks (featuring key-point generation, feature sampling, visibility net module & embedding generation) along with refinement & classification layers. The model is trained on regression, classification & ID losses. The model also consists of an Instance Bank module utilized for tracking ID assignment & management. Along with the 3D bounding box information & object ID, Sparse4D also outputs an instance feature containing high-dimensional semantics from the image encoder. The training algorithm optimizes the network to minimize the classification loss, regression loss & ID loss.\n\n

\n\n\n## Input:
\n\nSparse4D is trained on RGB images, camera calibration files, ground truth 3D bounding boxes & object ids, and optional depth maps. Since performing 3D multi-camera detection and tracking across large regions like warehouses with high-density camera setups is computationally expensive, we partition large regions into overlapping groups called Bird's Eye View (BEV) group. Each BEV group contains multiple cameras and serves as the fundamental training unit for Sparse4D. \n\n**Input Type(s):** Each BEV group will have cameras with RGB images, Camera calibration file, Ground Truth with 3D bounding boxes & Optional Depth Maps available via HuggingFace or generated synthetically by Nvidia Isaac Sim Replicator.
\n\n**Input Format:** Red, Green, Blue (RGB) images stored in raw png/jpg/hdf5 and Depth Maps stored in png/hdf5. Can support input resolution of 3 x 1080 x 1920 for both RGB & Depth Maps. Data preprocessing is required for grouping images & depth maps from multiple cameras to appropriate BEV groups. This can be done via the TAO Data Service.
\n\n**Input Parameters:** Multiple dimensions. See below for detailed model input shapes.
\n\n**Other Properties Related to Input:** 3 x 1080 x 1920 (C x H x W) resolution images for both RGB & Depth Maps. Data Pre-Processing needed via TAO Data Services. No alpha channel required.
\n\nNote that depth maps are optional and not required for evaluation or inference. The raw model inputs are as follows:\n\n| Dimension | Description |\n|-----------|-------------|\n| `B` | Batch size |\n| `C` | Number of channels |\n| `N` | Number of cameras |\n| `H` | Image height |\n| `W` | Image width |\n| `Q` | Number of queries |\n| `M` | Number of output boxes |\n| `E` | Number of instance features |\n\n| Input Name | Type | Shape | ResNet101 Shape | Description |\n|------------|------|-------|---------------|-------------|\n| `img` | List[Tensor] | (B, N, C, H, W) | (1, N, 3, 540, 960) | Input image tensor |\n| `projection_mat` | List[Tensor] | (B, N, 4, 4) | (1, 10, 4, 4) | List of projection matrices |\n| `image_wh` | List[Tensor] | (B, N, 2) | (1, 10, 2) | List of image width and height |\n| `input_cached_feature` | List[Tensor] | (B, 600, 256) | (1, 600, 256) | List of cached features |\n| `input_cached_anchor` | List[Tensor] | (B, 600, 11) | (1, 600, 11) | List of cached anchor |\n| `prev_exists` | List[Tensor] | (B) | (1) | Indicates if previous frame exists or not |\n| `interval_mask` | List[Tensor] | (Bx1x1) | (1x1x1) | Boolean to describe the interval mask |\n\n\n* No. of cameras is dynamic in the model.\n* Model is initialized with zero tensors for the `input_cached_feature`, `input_cached_anchor`, `prev_exists` & `interval_mask` at the first frame. These tensors will be updated automatically via instance bank from the second frame & onwards.\n\n

\n\n\n## Output:
\n**Output Type(s):** Tensors consisting of bounding boxes in 3D , object confidence scores, classes, class confidence scores, tracking object ID & instance features.
\n\n**Output Format:** List of Tensors.
\n\n**Output Parameters:** Multiple dimensions. See below for detailed model output shapes.
\n\n**Other Properties Related to Output:** Please see the details below.
\n\nThe final output is a list with length of batch size after post-processing. Each element is a dictionary with the following keys:\n\n| Output Name | Type | Shape | ResNet Shape | Description |\n|------------|------|-------|---------------|-------------|\n| `boxes_3d` | List[Tensor] | (B, M, 10) | (1, 600, 10) | List of 3D boxes: `(x, y, z, width, length, height, yaw, velocity_x, velocity_y, velocity_z)` in OV coordinates |\n| `scores_3d` | List[Tensor] | (B, M) | (1, 600) | List of object confidence scores (classification scores * centerness score) |\n| `labels_3d` | List[Tensor] | (B, M) | (1, 600) | List of class labels |\n| `cls_scores` | List[Tensor] | (B, M) | (1, 600) | List of classification scores |\n| `instance_ids` | List[Tensor] | (B, M) | (1, 600) | List of instance IDs |\n| `instance_feats` | List[Tensor] | (B, M, E) | (1, 600, 256) | List of instance features |\n\nwhere:\n\n- **x, y, z** - 3D coordinates of the bounding-box centroid in the world coordinate system which is in meters.\n- **width, length, height** - Box dimensions in meters along its x (width), y (length) and z (height) axes of the object-centered coordinate system, with the origin at the centroid.\n- **yaw** - Euler angle in radians about the y-axis of the object-centered coordinate system defining the box’s heading in the world coordinate system. (Pitch and roll are assumed zero.)\n- **velocity** - 3D velocity vector components in meters per second (m/s) in the world coordinate system, representing the object's instantaneous motion along the x, y, and z axes respectively.\n\n

\n\n\nOur AI models are designed and/or optimized to run on NVIDIA GPU-accelerated systems. By leveraging NVIDIA’s hardware (e.g. GPU cores) and software frameworks (e.g., CUDA libraries), the model achieves faster training and inference times compared to CPU-only solutions. \n\n## Software Integration:\n\n**Runtime Engine(s):** \n* DeepStream - 7.1
\n* TAO - 6.1.0
\n\n**Supported Hardware Microarchitecture Compatibility:**
\n* NVIDIA Blackwell
\n* NVIDIA Hopper
\n* NVIDIA Lovelace
\n* NVIDIA Ampere
\n\n**Preferred/Supported Operating Systems:**
\n* Linux
\n\nThese models are designed for use with NVIDIA hardware and software. For hardware, the models are compatible with any NVIDIA DataCenter GPU. For software, the models are specifically designed for the [TAO Toolkit](https://github.com/NVIDIA/tao_pytorch_backend).\n\n## Model versions (Latest):\n\n- **trainable_v2.2** (ResNet50 / ResNet101) - Pre-trained model for Sparse4D.\n- **deployable_v2.2** (ResNet50 / ResNet101) - Model for Sparse4D deployable to DeepStream or TensorRT.\n\n\n## Training, Testing, and Evaluation Datasets \n\n### Dataset Overview\n** Total Size:\n\n|Subset|No. of scenes|No. BEV groups|No. of objects per scene|No. of cameras per scene|Duration of each camera sequence|FPS|\n|:---:|:---:|:---:|:---:|:---:|:---:|:---:|\n|Train|90|3469|1-120|1-20|5 mins|30 FPS|\n\n** Total Number of Datasets: 3 Datasets in total including (MTMC Tracking 2025 and COSMOS augmented version of the MTMC Tracking 2025 dataset, SCOUT dataset)\n\n** Dataset partition: Training 80%, Testing 10%, Validation 10%
\n** Time period for training data collection: Collected throughout the year 2024-2025.
\n** Time period for testing data collection Collected throughout the year 2024-2025.
\n** Time period for validation data collection Collected throughout the year 2024-2025.
\n\nThe model is trained on the MTMC Tracking 2025 dataset available on [HuggingFace](https://huggingface.co/datasets/nvidia/PhysicalAI-SmartSpaces/tree/main/MTMC_Tracking_2025). \n\n### Data Format & Preprocessing\n\n#### Raw Data (MTMC Tracking 2025/AI City Challenge Format)\n\nThis raw data includes .mp4 RGB video files, depth maps stored in HDF5 format, ground_truth.json, calibration.json & map.png. For more details on these files including the ground truth format please refer to the raw dataset format [here](https://huggingface.co/datasets/nvidia/PhysicalAI-SmartSpaces#directory-structure-for-mtmc_tracking_2025). \n\nThe raw data may also be obtained from Nvidia Isaac Sim Replicator Agent [IRA](https://docs.isaacsim.omniverse.nvidia.com/latest/replicator_tutorials/tutorial_replicator_agent.html). When collected via this route, RGB image data & depth maps can be in frame output/HDF5 output. Utilize the TAO Data Service to convert your raw data format (AICity) to pickle format (OVPKL) accordingly.\n\n#### Pickle File Structure (OVPKL format)\n\nThe above raw data format needs to be converted to a pickle files for model training via the TAO DataService. The model will utilize these pickle files along with the above files for training. An example command can be found in the sparse4d finetuning notebook. The pickle file will consist of the items.\n\n\nThe process generates pickle files (`.pkl`) containing scene information. Each pickle file is a dictionary with the following top-level keys:\n\n- `metadata`: (dict) Contains metadata about the dataset.\n- `infos`: (list) A list of dictionaries, where each dictionary contains information about a specific frame in the scene.\n\n##### `metadata` key\n\nThe `metadata` dictionary contains the following keys:\n\n| Key | Type | Description | Example Value |\n| :--------- | :----- | :------------------------------------------- | :------------------------------------ |\n| `version` | `str` | Version of the dataset or split. | `'trainval_split'` |\n| `split_type` | `str` | Type of data split (e.g., 'all', 'train', 'validation'). | `'all'` |\n\n##### `infos` key\n\nThe `infos` key holds a list of dictionaries. Each dictionary in this list corresponds to a frame and contains the following keys:\n\n| Key | Type | Description | Example Value (Illustrative) |\n| :---------------- | :---------- | :--------------------------------------------------------------------------------------------------------- | :--------------------------------------------------------------- |\n| `frame_idx` | `int` | Index of the frame. | `0` |\n| `cams` | `dict` | Dictionary containing data for each camera in the frame. Keys are camera names (e.g., `'Camera'`, `'Camera_01'`). | See [cams Structure](#cams-structure) below. |\n| `scene_name` | `str` | Name of the scene. | `'Warehouse_014+bev-sensor-training-1'` |\n| `timestamp` | `float` | Timestamp of the frame. | `0.0` |\n| `token` | `str` | Unique token for the frame. | `'Warehouse_014+bev-sensor-training-1__000000000'` |\n| `group_name` | `str` | Name of the group this frame belongs to. | `'bev-sensor-training-1'` |\n| `instance_inds` | `np.ndarray`| Array of instance indices present in the frame. | `array([372, 171, 172, 631, 663])` |\n| `asset_inds` | `np.ndarray`| Array of asset indices corresponding to instances. | `array([ 771, 772, 775, 2094, 1372])` |\n| `gt_boxes` | `np.ndarray`| Ground truth bounding boxes for objects in the frame. Shape: (N, 7) where N is the number of objects. Each row is `[x, y, z, dx, dy, dz, heading]`. | `array([[-0.686, 1.073, ..., -0. ], ...])` |\n| `gt_names` | `np.ndarray`| Array of ground truth names for objects. | `array(['agility_digit', 'gr1_t2', ...], dtype='\n\n\n### Training Data \n\nThe dataset statistics used for pretraining the model are as follows:\n\n* Data Modality - Image
\n\n* Image Training Data Size - 1 Million to 1 Billion Images
\n\n* Data Collection Method by dataset - Synthetic
\n\n* Labeling Method by dataset - Synthetic
\n\n**Properties (Quantity, Dataset Descriptions, Sensor(s)):**\n\nPlease see above.\n\n* Model was trained on the following moving object classes: `Person`, `Fourier_GR1_T2_Humanoid`, `Agility_Digit_Humanoid`, `Nova_Carter`, `Transporter` and `Forklift`.\n* Both validation & testing was conduction on random scenes from the MTMC Tracking 2025 subset.\n\n\n## Testing and Evaluation Datasets\n\nBoth validation & testing was conduction on random scenes from the MTMC Tracking 2025 subset. \n\n* Data Collection Method by dataset - Synthetic
\n\n* Labeling Method by dataset - Synthetic
\n\n**Properties (Quantity, Dataset Descriptions, Sensor(s)):**\nWe utilize a random scenes from the test set of the MTMC Tracking 2025 subset.\n\n\n### Methodology and KPI\n\nThe key performance indicator is Higher Order Tracking Accuracy (HOTA) per-class and the average HOTA obtained across all classes. We utilize the HOTA evaluation methodology to assess multi-object tracking accuracy.\n\nHigher Order Tracking Accuracy (HOTA) is a metric that balances detection accuracy and association accuracy into a single unified score. It decomposes tracking performance into Detection Accuracy (DetA), which measures how well objects are localized, and Association Accuracy (AssA), which measures how well detections are linked over time into consistent tracks. HOTA is computed as the geometric mean of DetA and AssA, averaged over a range of localization thresholds. This provides a balanced, holistic measure of tracking quality that captures both spatial accuracy and temporal consistency.\n\nThe following scores are for v2.2 models trained on MTMC Tracking 2025 subset. The evaluation set and training set is disjoint.\n\n#### ResNet50 backbone (v2.2)\n\n| Object Class | HOTA | DetA | AssA | LocA |\n|---------------------------|-------|-------|-------|-------|\n| `Person` | 53.93 | 59.13 | 49.54 | 73.34 |\n| `Fourier_GR1_T2_Humanoid` | 59.31 | 59.87 | 58.84 | 73.46 |\n| `Agility_Digit_Humanoid` | 52.69 | 52.57 | 53.50 | 70.72 |\n| `Nova_Carter` | 58.26 | 56.89 | 59.92 | 71.05 |\n| `Transporter` | 33.70 | 38.98 | 31.49 | 68.41 |\n| `Forklift` | 48.05 | 43.84 | 54.97 | 66.69 |\n| Average | 50.99 | 51.88 | 51.37 | 70.61 |\n\n#### ResNet101 backbone (v2.2)\n\n| Object Class | HOTA | DetA | AssA | LocA |\n|---------------------------|-------|-------|-------|-------|\n| `Person` | 57.96 | 58.99 | 57.11 | 73.29 |\n| `Fourier_GR1_T2_Humanoid` | 60.93 | 60.97 | 60.98 | 74.00 |\n| `Agility_Digit_Humanoid` | 54.00 | 53.32 | 55.32 | 71.02 |\n| `Nova_Carter` | 54.85 | 57.60 | 53.28 | 70.92 |\n| `Transporter` | 33.98 | 38.13 | 32.58 | 67.33 |\n| `Forklift` | 48.05 | 43.78 | 55.20 | 66.45 |\n| Average | 51.63 | 52.13 | 52.41 | 70.50 |\n\n\n## Real-time Inference Performance \n\nInference runs through the DeepStream pipeline on TensorRT with mixed precision (FP16+FP32). The TensorRT columns capture model-only latency, while the DeepStream columns add the instance-bank pre- and post-processing overhead. The table summarizes how many cameras each GPU supports at 30, 15, and 10 FPS for the v2.0 model. Numbers in **bold** are measured (all TensorRT values and certain DeepStream values). DeepStream values not in bold are estimates based on the guidance that the DS microservice adds approximately 30% overhead over Sparse4D TensorRT model performance.\n\n| GPU | TensorRT @30 FPS | DeepStream @30 FPS | TensorRT @15 FPS | DeepStream @15 FPS | TensorRT @10 FPS | DeepStream @10 FPS |\n| :-- | ---------------: | -----------------: | ---------------: | -----------------: | ---------------: | -----------------: |\n| 1 x A100-SXM4-80GB | **13** | 9 | **28** | 19 | **43** | 30 |\n| 1 x B200 | **75** | 52 | **155** | 108 | **200** | 140 |\n| 1 x GB200 | **101** | 70 | **200** | 140 | **200** | 140 |\n| 1 x H100 NVL - 94GB | **23** | 16 | **48** | 33 | **72** | 50 |\n| 1 x H100 SXM HBM3 - 80GB | **28** | 19 | **58** | 40 | **89** | 62 |\n| 1 x H200 | **32** | 22 | **67** | 46 | **103** | 72 |\n| 1 x L4 - 24GB | **3** | 2 | **6** | 4 | **9** | 6 |\n| 1 x L40 | **8** | 5 | **16** | 11 | **26** | 18 |\n| 1 x L40S - 48GB | **9** | 6 | **20** | 14 | **30** | 21 |\n| 1 x RTX 6000 ADA | **9** | 6 | **19** | 13 | **27** | 18 |\n| 1 x RTX PRO 6000 Blackwell (Server) | **28** | 19 | **58** | 40 | **89** | 62 |\n| 1 x RTX PRO 6000 Blackwell (Workstation) | **29** | 20 | **59** | 41 | **90** | 63 |\n| 1 x IGX Thor - T7000 iGPU (no dGPU) | **5** | 3 | **11** | 7 | **17** | 11 |\n| 1 x IGX Thor - T7000 dGPU - RTX PRO 6000 Blackwell Max-Q Workstation Edition | **21** | 14 | **30** | 21 | **30** | 21 |\n| 1 x AGX Thor - T5000 | **4** | 2 | **8** | 5 | **14** | 9 |\n| 1 x DGX Spark | **5** | 3 | **11** | 7 | **17** | 11 |\n\n\n## Changelog\n\n### v2.2\n- Released two backbone variants of the same recipe: ResNet50 (lower latency / smaller footprint) and ResNet101 (high accuracy), shipped under `sparse4d_rn50` and `sparse4d_rn101` NGC model cards respectively.\n- The ResNet50 variant is built on top of an RT-DETR R50 pre-training initialization for stronger image features at half the backbone cost.\n- Added `pallet_truck` to the trained class set (`person`, `gr1_t2`, `agility_digit`, `nova_carter`, `transporter`, `forklift`, `pallet_truck`).\n- Expanded the training corpus to all available MTMC Tracking 2025 scenes (lazy-loaded), 3K+ BEV groups, and refreshed COSMOS-augmented data; mixed FPS training is unchanged.\n- Refreshed kmeans anchor priors per backbone (`_ov_kmeans900_v2.2_r50.npy`, `_ov_kmeans900_v2.2_r101.npy`).\n\n### v2.1\n- Trained on a significantly expanded dataset: more synthetic environments (retail, hospital, supermarket), GTC'24 warehouse data, COSMOS-transferred data with BEV groups, and real-world SCOUT data.\n- Leverages the upgraded camera grouping algorithm (SDU v1.2).\n- Corrected forklift orientation annotations.\n\n### v2.0\n- Increased the number of BEV groups to 1337 to improve accuracy across all benchmarks.\n- Added COSMOS-augmented datasets to the training set, using an 80:20 split between synthetic data and COSMOS augmentations.\n- Introduced multiple FPS settings in training to better handle low-frame-rate streams (1, 2, 3, 5, 6, 10, 15, and 30 FPS).\n- Increased the regression weight for rotation loss to improve bounding box fitting accuracy.\n\n### v1.1\n- Updated input image resolution to 960×540 and introduced camera embeddings to lift maximum camera limits.\n- Expanded training set to 34 scenes spanning 500+ cameras and 380 BEV groups (1–18 cameras each).\n- Supported classes: `Person`, `Fourier_GR1_T2_Humanoid`, `Agility_Digit_Humanoid`, `Nova_Carter`, `Transporter`, `Forklift`.\n- Mixed input frame rates (10, 15, 30 FPS) to improve robustness to lower streaming FPS.\n- Enabled sparser camera grouping with random frame dropping to mirror Data Service frame-loss scenarios.\n- Fixed rotation bug in object annotations and retrained the model with corrected labels.\n- New MSDA FP16 Kernel which helps improve throughput by ~1.5x-2x for Data Center GPUs available in the DeepStream Pipeline inside the Nvidia Video Search and Summarization (VSS) - Warehouse Blueprint release.\n\n### v1.0\n- First commercial warehouse-focused 3D detection and tracking release.\n- Input image resolution: 1408×512 and cameras limited to 20.\n- Supported classes: `Person`, `Fourier_GR1_T2_Humanoid`, `Agility_Digit_Humanoid`, `Nova_Carter`.\n\n\n## How to use this model \n\nIn order to use the model as pre-trained weights for transfer learning, please use the snippet below as a template for the `model` component of the experiment spec file to train a Sparse4D. For more information on experiment spec file, please refer to the [Train Adapt Optimize (TAO) Toolkit User Guide](https://docs.nvidia.com/tao/tao-toolkit/index.html).\n\n```yaml\nmodel:\n type: \"sparse4d\"\n use_grid_mask: true\n use_deformable_func: true\n use_temporal_align: true\n input_shape: [960, 540]\n embed_dims: 256\n neck:\n type: \"FPN\"\n num_outs: 4\n start_level: 0\n out_channels: 256\n in_channels: [256, 512, 1024, 2048]\n add_extra_convs: \"on_output\"\n relu_before_extra_convs: true\n depth_branch:\n type: \"dense_depth\"\n embed_dims: \"${model.embed_dims}\"\n num_depth_layers: 3\n loss_weight: 0.2\n head:\n type: \"sparse4d\"\n num_output: 300\n cls_threshold_to_reg: 0.05\n decouple_attn: true\n return_feature: true\n use_reid_sampling: false\n embed_dims: \"${model.embed_dims}\"\n num_groups: 8\n num_decoder: 6\n num_single_frame_decoder: 1\n drop_out: 0.1\n temporal: true\n with_quality_estimation: true\n instance_bank:\n num_anchor: 900\n anchor: ???\n num_temp_instances: 600\n confidence_decay: 0.8\n feat_grad: false\n default_time_interval: 0.033333\n embed_dims: \"${model.embed_dims}\"\n use_temporal_align: \"${model.use_temporal_align}\"\n anchor_encoder:\n type: 'SparseBox3DEncoder'\n vel_dims: 3\n embed_dims: [128, 32, 32, 64]\n mode: 'cat'\n output_fc: false\n in_loops: 1\n out_loops: 4\n operation_order: [\n \"deformable\", \"ffn\", \"norm\", \"refine\", \"temp_gnn\", \"gnn\", \"norm\", \n \"deformable\", \"ffn\", \"norm\", \"refine\", \"temp_gnn\", \"gnn\", \"norm\", \n \"deformable\", \"ffn\", \"norm\", \"refine\", \"temp_gnn\", \"gnn\", \"norm\", \n \"deformable\", \"ffn\", \"norm\", \"refine\", \"temp_gnn\", \"gnn\", \"norm\", \n \"deformable\", \"ffn\", \"norm\", \"refine\", \"temp_gnn\", \"gnn\", \"norm\", \n \"deformable\", \"ffn\", \"norm\", \"refine\"\n ]\n temp_graph_model:\n type: \"MultiheadAttention\"\n embed_dims: 512\n num_heads: 8\n batch_first: true\n dropout: 0.1\n graph_model:\n type: \"MultiheadAttention\"\n embed_dims: \"${model.head.temp_graph_model.embed_dims}\"\n num_heads: \"${model.head.temp_graph_model.num_heads}\"\n batch_first: true\n dropout: \"${model.head.temp_graph_model.dropout}\"\n norm_layer:\n type: \"LN\"\n normalized_shape: \"${model.embed_dims}\"\n ffn:\n type: \"AsymmetricFFN\"\n in_channels: 512\n pre_norm:\n type: \"LN\"\n embed_dims: 256\n feedforward_channels: 1024\n num_fcs: 2\n ffn_drop: 0.1\n act_cfg:\n type: \"ReLU\"\n inplace: true\n deformable_model:\n embed_dims: \"${model.embed_dims}\"\n num_groups: 8\n num_levels: 4\n attn_drop: 0.15\n use_deformable_func: true\n use_camera_embed: true\n residual_mode: \"cat\"\n kps_generator:\n embed_dims: \"${model.embed_dims}\"\n num_learnable_pts: 6\n fix_scale:\n - [0, 0, 0]\n - [0.45, 0, 0]\n - [-0.45, 0, 0]\n - [0, 0.45, 0]\n - [0, -0.45, 0]\n - [0, 0, 0.45]\n - [0, 0, -0.45]\n refine_layer:\n type: \"SparseBox3DRefinementModule\"\n embed_dims: \"${model.embed_dims}\"\n refine_yaw: true\n with_quality_estimation: true\n sampler:\n num_dn_groups: 5\n num_temp_dn_groups: 3\n dn_noise_scale: [2.0, 2.0, 2.0, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5]\n max_dn_gt: 128\n add_neg_dn: true\n cls_weight: 2.0\n box_weight: 0.25\n reg_weights: [2.0, 2.0, 2.0, 0.5, 0.5, 0.5, 0.0, 0.0, 0.0, 0.0, 0.0]\n use_temporal_align: \"${model.use_temporal_align}\"\n visibility_net:\n type: \"visibility_net\"\n embedding_dim: 256\n hidden_channels: 32\n loss:\n reg:\n type: \"sparse_box_3d\"\n box_weight: 0.25\n cls_allow_reverse: [5, 6, 7]\n cls:\n type: \"focal\"\n use_sigmoid: true\n gamma: 2.0\n alpha: 0.25\n loss_weight: 2.0\n id:\n type: \"cross_entropy_label_smooth\"\n num_ids: \"${dataset.num_ids}\"\n bnneck:\n type: \"bnneck\"\n feat_dim: 256\n num_ids: \"${dataset.num_ids}\"\n decoder:\n type: \"SparseBox3DDecoder\"\n score_threshold: 0.05\n reg_weights: [2.0, 2.0, 2.0, 1 ,1, 1, 1, 1, 1, 1, 1]\n\n```\n\n## Inference & Deployment:\n\nFor deployment of this model, please refer to the our Nvidia Video Search and Summarization (VSS) - Warehouse Blueprint release documentation.\n\n**Acceleration Engine:** Tensor(RT)
\n\n**Test Hardware:**
\n* NVIDIA Datacenter GPUs
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Governing Terms: Use of this model is governed by the NVIDIA Open Model License.

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They are capable of tracking your browser across other sites and building up a profile of your interests. This may impact the content and messages you see on other websites you visit. If you do not allow these cookies you may not be able to use or see these sharing tools.","alwaysActive","order",11,"cookies",[],"hosts",[],"C0004","Advertising Cookies","These cookies record your visit to our websites, the pages you have visited and the links you have followed to influence the advertisements that you see on other websites. These cookies and the information they collect may be managed by other companies, including our advertising partners, and may be used to build a profile of your interests and show you relevant advertising on other sites. We and our advertising partners will use this information to make our websites and the advertising displayed on it, more relevant to your interests.",5,[498,499,500,501,502,503,504,505,506,507,508,509,510,511,512,513,514,515,516,517,518,519],[383,384,385,386,387,388,389,390,391,392,393,394,395,396,397,398,399],{"_400":493,"_208":493,"_165":166,"_373":494},{"_400":489,"_208":489,"_165":166,"_373":490},{"_400":484,"_208":484,"_165":166,"_373":485},{"_400":480,"_208":480,"_165":166,"_373":481},{"_400":475,"_208":475,"_165":166,"_373":476},{"_400":470,"_208":470,"_165":166,"_373":471},{"_400":462,"_208":462,"_165":166,"_373":463},{"_400":454,"_208":454,"_165":166,"_373":455},{"_400":449,"_208":449,"_165":166,"_373":450},{"_400":444,"_208":444,"_165":166,"_373":445},{"_400":439,"_208":439,"_165":166,"_373":440},{"_400":434,"_208":434,"_165":166,"_373":435},{"_400":429,"_208":429,"_165":166,"_373":430},{"_400":422,"_208":422,"_165":166,"_373":423},{"_400":417,"_208":417,"_165":166,"_373":418},{"_400":410,"_208":410,"_165":166,"_373":411},{"_400":401,"_208":401,"_165":166,"_373":402},"hostName","amazon-adsystem.com",[403,404],{"_76":409,"_406":401,"_407":30,"_165":408},{"_76":405,"_406":401,"_407":30,"_165":408},"ad-privacy","host","isSession","This domain is owned by online retailer Amazon and is used as part of its affiliate marketing programme.","ad-id","doubleclick.net",[412,413],{"_76":416,"_406":410,"_407":30,"_165":415},{"_76":414,"_406":410,"_407":30,"_165":415},"IDE","This domain is owned by Doubleclick (Google). 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This tracking cookie allows a website to link visitor behaviour to the recipient of an email marketing campaign, to measure campaign effectiveness.","investor.nvidia.com","This cookie is associated with Eventbrite and is used to deliver content tailored to the end user's interests and improve content creation. This cookie is also used for event-booking purposes.","_gat_gtag_UA_140825383_2","Google Analytics","_rdt_uuid","This cookie is set by Reddit and is used for tracking the views of embedded videos and performance of the advertisements.","catalog.ngc.nvidia.com","_uetsid","This cookie is used by Bing to determine what ads should be shown that may be relevant to the end user perusing the site. 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If you do not allow these cookies, then some or all of these services may not function properly.",4,[591,592,593,594,595,596,597,598,599,600,601,602,603,604,605,606,607,608,609,610,611,612,613,614,615],[562,563,564,565,566],{"_400":475,"_208":475,"_165":166,"_373":586},{"_400":449,"_208":449,"_165":166,"_373":581},{"_400":576,"_208":576,"_165":166,"_373":577},{"_400":571,"_208":571,"_165":166,"_373":572},{"_400":567,"_208":567,"_165":166,"_373":568},"nvidia.partners",[569],{"_76":570,"_406":567,"_407":30,"_165":443},"edge","app.hushly.com",[573],{"_76":574,"_406":571,"_407":30,"_165":575},"*CORS","This domain is associated with Hushly, a platform that provides lead conversion solutions for content marketing by using personalization and content engagement strategies.","github.com",[578],{"_76":579,"_406":576,"_407":30,"_165":580},"_octo","This domain is owned by Github. 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These cookies may store a unique ID so that our system will remember you when you return. 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It contains the current session ID, whether the session is excluded due to sampling, and the expiration date of the session. The cookie is extended for an extra 15 minutes every time the user interacts with the website, up to the maximum user session duration (4 hours).","nvweb_A","_ga","This cookie name is associated with Google Universal Analytics - which is a significant update to Google's more commonly used analytics service. This cookie is used to distinguish unique users by assigning a randomly generated number as a client identifier. It is included in each page request in a site and used to calculate visitor, session and campaign data for the sites analytics reports. By default it is set to expire after 2 years, although this is customisable by website owners.","_uetvid","This is a cookie utilised by Microsoft Bing Ads and is a tracking cookie. It allows us to engage with a user that has previously visited our website.","tp","This cookie is associated with Adobe Analytics site tracking. It registers if the website's scroll-depth detection is active. This function remembers how far the user has scrolled on the current session across the website's sub-pages.","_hly_vid","This cookie _hly_vid is used to record website and server performance with each visit to the site. The data is aggregated and analyzed; therefore, it remains anonymous upon use.","_session_id","This cookie creates an interim session ID used as an in-session user ID.\n","s_cc","This cookie is associated with the Adobe Site Catalyst. It determines whether cookies are enabled in the web browser.","s_ecid","Adobe Analytics cookie containing the the Adobe Experience Cloud 1st party visitor id if the Analytics AMCV visitor id is not found.","_hjSessionUser_xxxxxx","Hotjar cookie that is set when a user first lands on a page with the Hotjar script. 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TAO Sparse4D Model Card

Model Overview

Description:

License/Terms of Use:

Deployment Geography:

Use Case:

Release Date:

References

Model Architecture

Input:

Output:

Software Integration:

Model versions (Latest):

Training, Testing, and Evaluation Datasets

Dataset Overview

Data Format & Preprocessing

Raw Data (MTMC Tracking 2025/AI City Challenge Format)

Pickle File Structure (OVPKL format)

metadata key

infos key

cams Structure

Public Datasets

Private Datasets

Self-Sourced Synthetic Data

Training Data

Testing and Evaluation Datasets

Methodology and KPI

ResNet50 backbone (v2.2)

ResNet101 backbone (v2.2)

Real-time Inference Performance

Changelog

v2.2

v2.1

v2.0

v1.1

v1.0

How to use this model

Inference & Deployment:

Ethical Considerations

`metadata` key

`infos` key

`cams` Structure