Question Answering Squad2.0 Megatron Uncased Model Card

Model Overview

This is a checkpoint for Megatron Uncased (340M parameters) model for Question Answering trained on the question answering dataset SQuADv2.0\nThe model was trained for 2 epochs, with O1/16 bit mixed precision and batch size of 12 on 2 V100 GPUs.\nThe model exact match (EM) score is 81.35% and an F1 score of 84.75%.

Model Architecture

Megatron is a large, powerful transformer developed by the Applied Deep Learning Research team at NVIDIA,\nwhich was trained with multinode and using mixed precision. Unlike BERT, the position of the layer normalization\nand the residual connection in the model architecture (similar to GPT-2 architucture) are swapped,\nwhich allowed the models to continue to improve as they were scaled up. This model reaches higher scores compared\nto BERT on a range of Natural Language Processing (NLP) tasks.

Apart from the Megatron architecture this model also includes a question answering model head, which is stacked on top of BERT.\nThis question answering head is a token classifier and is, more specifically, a single fully connected layer.

Intended Use

This model can be used as a part of the chat bot or semantic search system where it enables to find answers in the document to the factual questions\nTo extend this for collections of the documents it is usually combined with Information retrieval systems on the first step,\nwhich return a small number of documents or passages that may contain the answer and will go as an input to the question answering model.

The model returns a concrete span of the answer in the content. If you want to create a conversational full sentence answer,\nyou can either use some simple heuristics like, returning the full sentence where the answer is found. Or train another gnerative model,\nthat can take the question and the answer span and generate a full sentence answer.

This QA model is trained on Squad dataset but it may also work on any new content without a need for retraining.\nBut if you are working with specific technical language like for example medical one it may help first to fine tune\nthe basic language model on this type of a content.

Training Data

The Question Answering model was trained on Squad2.0 dataset which combines the 100,000 questions in SQuAD1.1\nwith over 50,000 unanswerable questions written adversarially by crowdworkers to look similar to answerable ones.\nTo do well on SQuAD2.0, systems must not only answer questions when possible,\nbut also determine when no answer is supported by the paragraph and abstain from answering.

SQuAD 1.1, the previous version of the SQuAD dataset, contains 100,000+ question-answer pairs on 500+ articles\nfrom Wikipedia.

Training works as follows: The user provides training and evaluation data in text form in JSON format. This data is parsed by scripts in NeMo and converted into model input.\nThe input sequence is a concatenation of a tokenized query and its according reading passage.\nThe question answering head predicts for each token in the reading passage or context if it is the start or end\nof the answer span. The model is trained using cross entropy loss.

Evaluation Metrics

With Extractive QA models, when the answer span is returned by the model, accuracy evaluation\nuses two metrics: The exact match (EM) and F1 score of the returned answer spans compared\nto the right answers. The overall EM and F1 scores are computed for a model by averaging\nthe individual example scores.

Exact match: If the answer span is exactly equal to the correct one, it returns 1;\notherwise, it returns 0. When assessing against a negative example (SQuAD 2.0), if the model\npredicts any text at all, it automatically receives a 0 for that example.
F1: The F1 score is a common metric for classification problems and widely used in QA.\nIt is appropriate when we care equally about precision and recall. In this case, it's computed\nover the individual words in the prediction against those in the True Answer. The number of\nshared words between the prediction and the truth is the basis of the F1 score: Precision is the\nratio of the number of shared words to the total number of words in the prediction, and recall is\nthe ratio of the number of shared words to the total number of words in the ground truth.\nF1 = 2 * (precision * recall) / (precision + recall)

How to Use This Model

These model checkpoints are intended to be used with the Train Adapt Optimize (TAO) Toolkit.\nIn order to use these checkpoints, there should be a specification file (.yaml) that specifies hyperparameters, datasets for training and evaluation, and any other information needed for the experiment.\nFor more information on the experiment spec files for each use case, please refer to the TAO Toolkit User Guide.

Note: The model is encrypted and will only operate with the model load key tao-encode.

To fine-tune from a model checkpoint (.tlt), use the following command (`` parameter should be a valid path to the file that specifies the fine-tuning hyperparameters,\nthe dataset to fine-tune on, the dataset to evaluate on, epochs number):

!tao question_answering finetune -e \\\n -m \\\n -g \n\n

To evaluate an existing dataset using a model checkpoint (.tlt), use the following command\n(`` parameter should be a valid path to the file that specifies the dataset\nthat is being evaluated):

!tao question_answering evaluate -e \\\n -m \n

References

Squad dataset: https://rajpurkar.github.io/SQuAD-explorer/
Megatron model: https://developer.nvidia.com/blog/language-modeling-using-megatron-a100-gpu/

License

By downloading and using the models and resources packaged with TAO Conversational AI, you would be accepting the terms of the Riva license

Ethical AI

NVIDIA’s platforms and application frameworks enable developers to build a wide array of AI applications.\nConsider potential algorithmic bias when choosing or creating the models being deployed.\nWork with the model’s developer to ensure that it meets the requirements for the relevant industry and use case;\nthat the necessary instruction and documentation are provided to understand error rates, confidence intervals, and results; and that the model is being used under the conditions and in the manner intended.

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Unlike BERT, the position of the layer normalization \nand the residual connection in the model architecture (similar to GPT-2 architucture) are swapped, \nwhich allowed the models to continue to improve as they were scaled up. This model reaches higher scores compared \nto BERT on a range of Natural Language Processing (NLP) tasks.\n\nApart from the Megatron architecture this model also includes a question answering model head, which is stacked on top of BERT.\nThis question answering head is a token classifier and is, more specifically, a single fully connected layer.\n\nIntended Use\n------------\n\nThis model can be used as a part of the chat bot or semantic search system where it enables to find answers in the document to the factual questions\nTo extend this for collections of the documents it is usually combined with Information retrieval systems on the first step,\nwhich return a small number of documents or passages that may contain the answer and will go as an input to the question answering model.\n\nThe model returns a concrete span of the answer in the content. If you want to create a conversational full sentence answer,\nyou can either use some simple heuristics like, returning the full sentence where the answer is found. Or train another gnerative model,\nthat can take the question and the answer span and generate a full sentence answer.\n\nThis QA model is trained on Squad dataset but it may also work on any new content without a need for retraining.\nBut if you are working with specific technical language like for example medical one it may help first to fine tune \nthe basic language model on this type of a content.\n\nTraining Data\n-------------\n\nThe Question Answering model was trained on Squad2.0 dataset which combines the 100,000 questions in SQuAD1.1 \nwith over 50,000 unanswerable questions written adversarially by crowdworkers to look similar to answerable ones. \nTo do well on SQuAD2.0, systems must not only answer questions when possible, \nbut also determine when no answer is supported by the paragraph and abstain from answering.\n\nSQuAD 1.1, the previous version of the SQuAD dataset, contains 100,000+ question-answer pairs on 500+ articles\nfrom Wikipedia.\n\nTraining works as follows: The user provides training and evaluation data in text form in JSON format. This data is parsed by scripts in NeMo and converted into model input. \nThe input sequence is a concatenation of a tokenized query and its according reading passage. \nThe question answering head predicts for each token in the reading passage or context if it is the start or end \nof the answer span. The model is trained using cross entropy loss.\n\nEvaluation Metrics\n------------------\n\nWith Extractive QA models, when the answer span is returned by the model, accuracy evaluation\nuses two metrics: The exact match (EM) and F1 score of the returned answer spans compared\nto the right answers. The overall EM and F1 scores are computed for a model by averaging\nthe individual example scores.\n\n* `Exact match`: If the answer span is exactly equal to the correct one, it returns 1;\n otherwise, it returns 0. When assessing against a negative example (SQuAD 2.0), if the model\n predicts any text at all, it automatically receives a 0 for that example.\n* `F1`: The F1 score is a common metric for classification problems and widely used in QA.\n It is appropriate when we care equally about precision and recall. In this case, it's computed\n over the individual words in the prediction against those in the True Answer. The number of\n shared words between the prediction and the truth is the basis of the F1 score: Precision is the\n ratio of the number of shared words to the total number of words in the prediction, and recall is\n the ratio of the number of shared words to the total number of words in the ground truth.\n `F1 = 2 * (precision * recall) / (precision + recall)`\n\n\nHow to Use This Model\n---------------------\nThese model checkpoints are intended to be used with the Train Adapt Optimize (TAO) Toolkit.\nIn order to use these checkpoints, there should be a specification file (.yaml) that specifies hyperparameters, datasets for training and evaluation, and any other information needed for the experiment.\nFor more information on the experiment spec files for each use case, please refer to the [TAO Toolkit User Guide](https://docs.nvidia.com/tao/tao-toolkit/text/overview.html).\n\nNote: The model is encrypted and will only operate with the model load key `tao-encode`.\n\n- To fine-tune from a model checkpoint (.tlt), use the following command (`` parameter should be a valid path to the file that specifies the fine-tuning hyperparameters, \nthe dataset to fine-tune on, the dataset to evaluate on, epochs number):\n\n```\n!tao question_answering finetune -e \\\n -m \\\n -g \n\n```\n\n- To evaluate an existing dataset using a model checkpoint (.tlt), use the following command\n(`` parameter should be a valid path to the file that specifies the dataset \nthat is being evaluated):\n\n```\n!tao question_answering evaluate -e \\\n -m \n```\n\n\nReferences\n----------\n\n- Squad dataset: https://rajpurkar.github.io/SQuAD-explorer/\n- Megatron model: https://developer.nvidia.com/blog/language-modeling-using-megatron-a100-gpu/\n\n\nLicense \n-------\n\nBy downloading and using the models and resources packaged with TAO Conversational AI, you would be accepting the terms of the Riva [license](https://developer.nvidia.com/riva/ga/license)\n\n\nSuggested reading\n-----------------\n\n- More information on about TAO Toolkit and pre-trained models can be found at the [NVIDIA Developer Zone](https://developer.nvidia.com/tao-toolkit)\n- Read the [TAO Toolkit getting Started](https://docs.nvidia.com/tao/tao-toolkit/text/tao_quick_start_guide.html) guide and [release notes](https://docs.nvidia.com/tao/tao-toolkit/text/release_notes.html)\n- If you have any questions or feedback, please refer to the discussions on [TAO Toolkit Developer Forums](https://forums.developer.nvidia.com/c/accelerated-computing/intelligent-video-analytics/tao-toolkit/17)\n- Deploy your model for Production using Riva. Learn more about [Riva framework](https://docs.nvidia.com/deeplearning/riva/user-guide/docs/index.html)\n\n\nEthical AI\n----------\n\nNVIDIA’s platforms and application frameworks enable developers to build a wide array of AI applications.\nConsider potential algorithmic bias when choosing or creating the models being deployed.\nWork with the model’s developer to ensure that it meets the requirements for the relevant industry and use case;\nthat the necessary instruction and documentation are provided to understand error rates, confidence intervals, and results; and that the model is being used under the conditions and in the manner intended.","displayName","Question Answering SQUAD2.0 Megatron",["D",1696600544093],"publisher","NVIDIA","latestVersion","collectionCounts","imageUrl","/api/image/nvidia/tao/models/questionanswering_squad_english_megatron","rawImageUrl","https://dz112fgwz7ogh.cloudfront.net/logos/Nvidia-Centric-TAO-RIVA.png","canGuestDownload","latestVersionSizeInBytes","licenseTerms","isMultinodeEnabled","isMultiArchitecture","bias","explainability","privacy","safetyAndSecurity","featureLabels",[],"displayLabels",[253,254,255,256,257],"policyLabels",[],"systemLabels",[],"products",[],"hasNimMetadata",{"_222":274,"_259":274,"_260":275,"_262":263},{"_222":272,"_259":272,"_260":273,"_262":263},{"_222":268,"_259":269,"_260":270,"_262":263},{"_222":265,"_259":265,"_260":266,"_262":263},{"_222":258,"_259":258,"_260":261,"_262":263},"SQUAD2.0","value","filter",{"_264":263,"_259":258},"category","label","field","Riva",{"_264":267,"_259":265},"framework","Question Answering","uscs_question_answering",{"_264":271,"_259":269},"application","NLP",{"_264":263,"_259":272},"Megatron",{"_264":263,"_259":274},{"_130":1256,"_132":1257},"ngcApps",[1209],"csaApiBaseUrl","https://www.nvidia.com/ai-agents/csa-agent/dcsm","datadogRum",{"_1190":1191,"_1192":1193,"_1194":1195,"_1196":1197,"_1198":287,"_161":313,"_1199":1200,"_1201":59,"_1202":109,"_1203":109,"_1204":1205,"_1206":109,"_1207":1208},"amplitude",{"_1187":1188,"_826":-7,"_1189":35},"disableJs","environment","prod","featureFlagsBlob","JTdCJTIydGVzdEZsYWclMjIlM0FmYWxzZSUyQyUyMnNob3dTZWFyY2hMYWJlbFNldEZpbHRlcnMlMjIlM0FmYWxzZSUyQyUyMmVuYWJsZUNzYVdpZGdldCUyMiUzQWZhbHNlJTJDJTIyZW5hYmxlUHJvZHVjdEdyb3VwaW5nQnlTdWJzY3JpcHRpb24lMjIlM0FmYWxzZSUyQyUyMmNvbnRhaW5lclNjYW5uaW5nUmVkZXNpZ25NMiUyMiUzQWZhbHNlJTdE","featureFlagsGuarded","isDevLikeEnv","isPlaywright","isMobileDevice","categorizedOrgs",{"_1181":1182,"_1183":1184,"_1185":1186},"currentOrgContext","currentContextRoles",[],"enterpriseOrgs",[],"manageableExternalUserGroups",[],"ngcApiOrigin","ngcHelmOrigin","origin","https://catalog.ngc.nvidia.com","usesMocks","theme","year",2026,"now",1789390199297,"1.15.0","defaultSearchSuggestions",{"_1066":191,"_1067":1068,"_1069":1070,"_1071":1072},"announcements",[],"consentState",{"_351":1056,"_1057":109,"_1058":35,"_1059":35,"_1060":1061},"consentConfig",{"_333":334,"_335":336,"_337":338,"_339":340,"_341":342,"_343":344,"_345":346,"_347":348,"_349":350,"_351":352},"showContactAdmin",1789390199298,[],[],[327,328,329,330,331,332],{"_49":63,"_51":74,"_53":125,"_55":-5,"_57":-5,"_58":59},{"_49":63,"_51":70,"_53":125,"_55":-5,"_57":-5,"_58":59},{"_49":63,"_51":68,"_53":125,"_55":-5,"_57":-5,"_58":59},{"_49":63,"_51":64,"_53":125,"_55":-5,"_57":-5,"_58":59},{"_49":60,"_51":61,"_53":54,"_55":56,"_57":62,"_58":59},{"_49":50,"_51":52,"_53":125,"_55":-5,"_57":-5,"_58":59},"mainInfoText","We and our third-party partners (including social media, advertising, and analytics partners) use cookies and other tracking technologies to collect, store, monitor, and process certain information about you when you visit our website. 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