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Model Overview

Speaker Recognition is a broad research area that solves two major tasks: speaker identification (who is speaking?) and speaker verification (is the speaker who they claim to be?). In this work, we focus on far-field, text-independent speaker recognition when the identity of the speaker is based on how the speech is spoken, not necessarily on what is being said. Typically such SR systems operate on unconstrained speech utterances, which are converted into vectors of fixed length, called speaker embeddings. Speaker embeddings are also used in automatic speech recognition (ASR) and speech synthesis.

This model with modified ecapa based encoder[1] is trained end-to-end using angular softmax loss for speaker verification and diarization purposes and for extracting speaker embeddings

Model Architecture

ECAPA models consists of blocks of time delay neural blocks (TDNNs) and squeeze and excite (SE) layers unified with blocks of Res2Block layers. For faster training with similar performance numbers on diarization tasks we replaced Res2Blocks with group convolution layers This encoded information is then pooled by attention means to get speaker embeddings.[1]

Training

These models were trained on a composite dataset comprising of several thousand hours of speech, compiled from various publicly available sources. The NeMo toolkit [2] was used for training this model over few hundred epochs on multiple GPUs.

Datasets

The following datasets are used for training

Voxceleb 1 Dev data (1211 speakers)
Voxceleb 2 Dev data (5994 speakers)
RIR noise
Fisher
SwitchBoard
Librispeech

Performance

This ECAPA model which is based on layers of TDNNs and SEs structure with 22.3M parameters achieves 0.92% EER on voxceleb clean test trial file and\nAlso achieves the following results on common evaluation datasets (without finetuning on any dev set):

\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\">

EVALUATIONTYPE	NIST_SRE_200	AMI(Lapel)	AMI(MixHeadset)	CH109
ORACLEKNOWN #SPEAKERS	7.1	1.94	2.31	1.19
ORACLEUNKNOWN #SPEAKERS	6.78	2.58	2.13	1.73

How to use this model

For training and extracting embeddings detailed step by step, procedure has provided in Speaker Verification notebook. and Embeddings extraction script

Extract Embeddings

For a single audio file, one can also extract embeddings inline using

import nemo.collections.asr as nemo_asr\nspeaker_model = nemo_asr.models.EncDecSpeakerLabelModel.from_pretrained(model_name='ecapa_tdnn')\nembs = speaker_model.get_embedding('audio_path')\n

Speaker Verification

Speaker Verification is a task of verifying if two utterances are from the same speaker or not.\nWe provide a helper function to verify the audio files and return True if two provided audio files are from the same speaker, False otherwise.\nThe audio files should be 16KHz mono channel wav files.

import nemo.collections.asr as nemo_asr\nspeaker_model = nemo_asr.models.EncDecSpeakerLabelModel.from_pretrained(model_name='ecapa_tdnn')\ndecision = speaker_model.verify_speakers('path/to/one/audio_file','path/to/other/audio_file')\n

Input

This model accepts 16000 KHz Mono-channel Audio (wav files) as input.

Output

This model provides embeddings of size 192 from a speaker for a given audio sample.

Limitations

This model is trained on both telephonic and non-telephonic speech from voxceleb datasets, Fisher and switch board. If your domain of data differs from trained data or doesnot show relatively good performance consider finetuning for that speech domain.

References

[1] ECAPA-TDNN Embeddings for Speaker Diarization\n[2] NVIDIA NeMo Toolkit

Licence

License to use this model is covered by the license of the NeMo Toolkit [2]. By downloading the public and release version of the model, you accept the terms and conditions of this license.

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In this work, we focus on far-field, text-independent speaker recognition when the identity of the speaker is based on how the speech is spoken, not necessarily on what is being said. Typically such SR systems operate on unconstrained speech utterances, which are converted into vectors of fixed length, called speaker embeddings. Speaker embeddings are also used in automatic speech recognition (ASR) and speech synthesis.\n\nThis model with modified ecapa based encoder[1] is trained end-to-end using angular softmax loss for speaker verification and diarization purposes and for extracting speaker embeddings\n\n## Model Architecture\n\nECAPA models consists of blocks of time delay neural blocks (TDNNs) and squeeze and excite (SE) layers unified with blocks of Res2Block layers. For faster training with similar performance numbers on diarization tasks we replaced Res2Blocks with group convolution layers This encoded information is then pooled by attention means to get speaker embeddings.[1]\n\n## Training\nThese models were trained on a composite dataset comprising of several thousand hours of speech, compiled from various publicly available sources. The NeMo toolkit [2] was used for training this model over few hundred epochs on multiple GPUs. \n\n### Datasets\nThe following datasets are used for training\n\n- [Voxceleb 1 Dev data](http://www.robots.ox.ac.uk/~vgg/data/voxceleb/vox1.html) (1211 speakers) \n- [Voxceleb 2 Dev data](http://www.robots.ox.ac.uk/~vgg/data/voxceleb/vox2.html) (5994 speakers) \n- [RIR noise](http://www.openslr.org/28/)\n- Fisher\n- SwitchBoard\n- Librispeech\n\n## Performance\n\nThis ECAPA model which is based on layers of TDNNs and SEs structure with 22.3M parameters achieves 0.92% EER on voxceleb clean test trial file and \nAlso achieves the following results on common evaluation datasets (without finetuning on any dev set):\n\n| EVALUATIONTYPE | NIST_SRE_200 | AMI(Lapel) | AMI(MixHeadset) | CH109 |\n|:---------------------------:|:------------:|:--------------:|:-------------------:|:-----:|\n| ORACLEKNOWN #SPEAKERS | 7.1 | 1.94 | 2.31 | 1.19 |\n| ORACLEUNKNOWN #SPEAKERS | 6.78 | 2.58 | 2.13 | 1.73 |\n\n## How to use this model\n\nFor training and extracting embeddings detailed step by step, procedure has provided in [Speaker Verification notebook](https://github.com/NVIDIA/NeMo/blob/main/tutorials/speaker_tasks/Speaker_Recognition_Verification.ipynb). and [Embeddings extraction script](https://github.com/NVIDIA/NeMo/blob/main/examples/speaker_recognition/extract_speaker_embeddings.py)\n\n### Extract Embeddings\nFor a single audio file, one can also extract embeddings inline using \n```python\nimport nemo.collections.asr as nemo_asr\nspeaker_model = nemo_asr.models.EncDecSpeakerLabelModel.from_pretrained(model_name='ecapa_tdnn')\nembs = speaker_model.get_embedding('audio_path')\n```\n\n### Speaker Verification\nSpeaker Verification is a task of verifying if two utterances are from the same speaker or not.\nWe provide a helper function to verify the audio files and return True if two provided audio files are from the same speaker, False otherwise.\nThe audio files should be 16KHz mono channel wav files.\n```python\nimport nemo.collections.asr as nemo_asr\nspeaker_model = nemo_asr.models.EncDecSpeakerLabelModel.from_pretrained(model_name='ecapa_tdnn')\ndecision = speaker_model.verify_speakers('path/to/one/audio_file','path/to/other/audio_file')\n```\n\n### Input\n\nThis model accepts 16000 KHz Mono-channel Audio (wav files) as input.\n\n### Output\n\nThis model provides embeddings of size 192 from a speaker for a given audio sample.\n\n## Limitations\nThis model is trained on both telephonic and non-telephonic speech from voxceleb datasets, Fisher and switch board. If your domain of data differs from trained data or doesnot show relatively good performance consider finetuning for that speech domain. \n\n\n\n## References\n[1] [ECAPA-TDNN Embeddings for Speaker Diarization](https://arxiv.org/pdf/2104.01466.pdf)\n[2] [NVIDIA NeMo Toolkit](https://github.com/NVIDIA/NeMo)\n\n\n\n## Licence\n\nLicense to use this model is covered by the license of the NeMo Toolkit [2]. 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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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It helps track your activity on the platform, including how you interact with their embedded services on other websites.","C0003","Personalization Cookies","These cookies collect data about how you have interacted with our website to help us improve your web experience, such as which pages you have visited. These cookies may store a unique ID so that our system will remember you when you return. They may be set by us or by third party providers whose services we have added to our pages. These cookies enable us to provide enhanced website functionality and personalization as well as make the marketing messages we send to you more relevant to your interests. If you do not allow these cookies, then some or all of these services may not function properly.",[585,586,587,588,589,590,591,592,593,594,595,596,597,598,599,600,601,602,603,604,605,606,607,608,609],[556,557,558,559,560],{"_394":470,"_212":470,"_167":396,"_367":580},{"_394":444,"_212":444,"_167":396,"_367":575},{"_394":570,"_212":570,"_167":396,"_367":571},{"_394":565,"_212":565,"_167":396,"_367":566},{"_394":561,"_212":561,"_167":396,"_367":562},"nvidia.partners",[563],{"_78":564,"_401":561,"_402":30,"_167":438},"edge","app.hushly.com",[567],{"_78":568,"_401":565,"_402":30,"_167":569},"*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",[572],{"_78":573,"_401":570,"_402":30,"_167":574},"_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. Information collected with these cookies is used to measure and find ways to improve website performance.",[668,669,670,671,672,673,674,675,676,677,678,679,680,681,682,683,684,685,686,687,688,689,690,691,692,693,694,695,696],[648,649,650,651],{"_394":663,"_212":663,"_167":396,"_367":664},{"_394":658,"_212":658,"_167":396,"_367":659},{"_394":457,"_212":457,"_167":396,"_367":655},{"_394":570,"_212":570,"_167":396,"_367":652},[653],{"_78":654,"_401":570,"_402":86,"_167":574},"_gh_sess",[656],{"_78":657,"_401":457,"_402":86,"_167":464},"YSC","bizible.com",[660],{"_78":661,"_401":658,"_402":30,"_167":662},"_BUID","Bizible is a marketing attribution software that tracks the performance of marketing efforts and connects them to revenue, primarily used for B2B environments.","a.usbrowserspeed.com",[665],{"_78":666,"_401":663,"_402":30,"_167":667},"tuid","This domain is owned by Ookla which provides internet speed testing services through its Speedtest application.",{"_78":738,"_401":516,"_402":30,"_167":739},{"_78":723,"_401":737,"_402":86,"_167":724},{"_78":706,"_401":519,"_402":30,"_167":631},{"_78":706,"_401":619,"_402":30,"_167":631},{"_78":735,"_401":516,"_402":30,"_167":736},{"_78":723,"_401":522,"_402":86,"_167":724},{"_78":733,"_401":516,"_402":30,"_167":734},{"_78":723,"_401":519,"_402":86,"_167":724},{"_78":731,"_401":618,"_402":30,"_167":732},{"_78":723,"_401":640,"_402":86,"_167":724},{"_78":703,"_401":519,"_402":30,"_167":705},{"_78":729,"_401":516,"_402":86,"_167":730},{"_78":727,"_401":516,"_402":30,"_167":728},{"_78":725,"_401":516,"_402":86,"_167":726},{"_78":723,"_401":614,"_402":86,"_167":724},{"_78":721,"_401":516,"_402":30,"_167":722},{"_78":719,"_401":516,"_402":30,"_167":720},{"_78":717,"_401":516,"_402":86,"_167":718},{"_78":715,"_401":623,"_402":30,"_167":716},{"_78":703,"_401":614,"_402":30,"_167":705},{"_78":713,"_401":516,"_402":30,"_167":714},{"_78":711,"_401":516,"_402":86,"_167":712},{"_78":709,"_401":516,"_402":30,"_167":710},{"_78":707,"_401":516,"_402":30,"_167":708},{"_78":706,"_401":516,"_402":30,"_167":631},{"_78":703,"_401":704,"_402":30,"_167":705},{"_78":701,"_401":516,"_402":30,"_167":702},{"_78":699,"_401":516,"_402":86,"_167":700},{"_78":697,"_401":516,"_402":30,"_167":698},"_ga_xxxxxxxxxx","Used by Google Analytics to identify and track an individual session with your device.","s_ppvl","This cookie is set by Adobe Analytics to store information on the percentage of the page displayed to the end user.","coveo_visitorId","This cookie name is associated with Coveo which is used to store a unique user ID for marketing purposes and to track the number of distinct users who submitted a query or clicked an item, counting them only once even if they did the same query or clicked the same item over the course of many visits.","_dd_s","marketplace.nvidia.com","Datadog Cookie used to group all events generated from a unique user session across multiple pages. 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