Model Overview

A framework for self-supervised learning of speech representations which masks latent representations of the raw waveform and solves a contrastive task over quantized speech representations.

Model Architecture

The model takes raw waveforms as its input. A fully convolutional feature extractor reduces the resolution of the signal to a single vector roughly every 20 ms. Most of the computation is performed in the transformer encoder part of the model. The outputs of the transformer, and quantized outputs from the feature extractor, serve as inputs to the contrastive loss. During fine-tuning, this loss is replaced with the CTC loss, and quantization is not performed.

\n $\"wav2vec$ \n

\n Figure 1. The architecture of wav2vec 2.0 ([source](https://proceedings.neurips.cc/paper/2020/file/92d1e1eb1cd6f9fba3227870bb6d7f07-Paper.pdf)). The model is composed of a convolutional feature extractor, and a transformer encoder. During fine-tuning, quantization is disabled and contrastive loss is replaced with the CTC loss function.\n

In addition, our model uses the Hourglass Transformer architecture for the encoder. This architecture uses fixed-sized pooling in order to reduce the time dimension T of the signal, and thus, lower the O(T²) cost of the self-attention mechanism.

\n $\"The$ \n

\n Figure 2. The Hourglass Transformer module ([source](https://arxiv.org/abs/2110.13711)). The signal is processed by the initial layers and downsampled. Most of the layers operate on the downsampled signal. Finally, the signal is upsampled for the final layers. The Hourglass Transformer replaced a regular stack of transformer layers, typically improving throughput and lowering memory consumption.\n

Training

This model was trained using script available on NGC and in GitHub repo.

Dataset

The following datasets were used to train this model:

LibriSpeech - Corpus of approximately 1000 hours of 16kHz read English speech derived from audiobooks from the LibriVox project, carefully segmented and aligned.

Performance

Performance numbers for this model are available in NGC.

References

License

This model was trained using open-source software available in Deep Learning Examples repository.\nFor terms of use, please refer to the license of the script and the datasets the model was derived from.

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\n $\"wav2vec$ \n

\n\nIn addition, our model uses the Hourglass Transformer architecture for the encoder. This architecture uses fixed-sized pooling in order to reduce the time dimension _T_ of the signal, and thus, lower the _O(T²)_ cost of the self-attention mechanism.\n\n

\n $\"The$ \n

\n\n\n \n## Training\n\nThis model was trained using script available on [NGC](https://catalog.ngc.nvidia.com/orgs/nvidia/teams/dle/resources/wav2vec2_pyt) and in [GitHub repo](https://github.com/NVIDIA/DeepLearningExamples/tree/master/PyTorch/SpeechRecognition/wav2vec2).\n\n## Dataset\n\nThe following datasets were used to train this model:\n- [LibriSpeech](http://www.openslr.org/12) - Corpus of approximately 1000 hours of 16kHz read English speech derived from audiobooks from the LibriVox project, carefully segmented and aligned.\n\n\n## Performance\n\nPerformance numbers for this model are available in [NGC](https://catalog.ngc.nvidia.com/orgs/nvidia/teams/dle/resources/wav2vec2_pyt/performance).\n\n## References\n- [Original paper](https://proceedings.neurips.cc/paper/2020/file/92d1e1eb1cd6f9fba3227870bb6d7f07-Paper.pdf)\n- [NVIDIA model implementation in NGC](https://catalog.ngc.nvidia.com/orgs/nvidia/teams/dle/resources/wav2vec2_pyt)\n- [NVIDIA model implementation on GitHub](https://github.com/NVIDIA/DeepLearningExamples/tree/master/PyTorch/SpeechRecognition/wav2vec2)\n\n## License\n\nThis model was trained using open-source software available in [Deep Learning Examples](https://github.com/NVIDIA/DeepLearningExamples/tree/master/PyTorch/SpeechRecognition/wav2vec2) repository.\nFor terms of use, please refer to the license of the script and the datasets the model was derived from.","displayName","wav2vec 2.0 Base pre-trained",["D",1680635297284],"publisher","NVIDIA Deep Learning Examples","latestVersion","versions","collectionCounts","imageUrl","/api/image/nvidia/dle/models/wav2vec2_base_pyt_ckpt_finetune","rawImageUrl","https://assets.nvidiagrid.net/ngc/logos/Deep-Learning-Examples.png","canGuestDownload","latestVersionSizeInBytes","licenseTerms","isMultinodeEnabled","isMultiArchitecture","bias","explainability","privacy","safetyAndSecurity","featureLabels",[],"displayLabels",[237,238],"policyLabels",[],"systemLabels",[],"products",[],"hasNimMetadata",{"_205":246,"_240":246,"_241":247,"_243":244},{"_205":239,"_240":239,"_241":242,"_243":244},"Automatic Speech Recognitions","value","filter",{"_245":244,"_240":239},"category","label","field","ASR",{"_245":244,"_240":246},{"_107":1423,"_109":1424},"ngcApps",[1376],"csaApiBaseUrl","https://www.nvidia.com/ai-agents/csa-agent/dcsm","datadogRum",{"_1357":1358,"_1359":1360,"_1361":1362,"_1363":1364,"_1365":259,"_138":283,"_1366":1367,"_1368":56,"_1369":86,"_1370":86,"_1371":1372,"_1373":86,"_1374":1375},"amplitude",{"_1354":1355,"_956":-7,"_1356":31},"disableJs","environment","prod","featureFlagsBlob","JTdCJTIydGVzdEZsYWclMjIlM0FmYWxzZSUyQyUyMnNob3dTZWFyY2hMYWJlbFNldEZpbHRlcnMlMjIlM0FmYWxzZSUyQyUyMmNoaW5hTmltRGlzdHJpYnV0b3JzUmVkZXNpZ24lMjIlM0F0cnVlJTJDJTIyZW5hYmxlQ3NhV2lkZ2V0JTIyJTNBZmFsc2UlMkMlMjJlbmFibGVQcm9kdWN0R3JvdXBpbmdCeVN1YnNjcmlwdGlvbiUyMiUzQWZhbHNlJTJDJTIyY29udGFpbmVyU2Nhbm5pbmdSZWRlc2lnbk0xJTIyJTNBdHJ1ZSU3RA==","featureFlagsGuarded","isDevLikeEnv","isPlaywright","isMobileDevice","categorizedOrgs",{"_1348":1349,"_1350":1351,"_1352":1353},"currentOrgContext","currentContextRoles",[],"enterpriseOrgs",[],"locale","en","ngcApiOrigin","ngcHelmOrigin","origin","https://catalog.ngc.nvidia.com","usesMocks","theme","year",2026,"1.7.3","defaultSearchSuggestions",{"_1231":167,"_1232":1233,"_1234":1235,"_1236":1237},"announcements",[],"consentState",{"_321":1221,"_1222":86,"_1223":31,"_1224":31,"_1225":1226},"consentConfig",{"_303":304,"_305":306,"_307":308,"_309":310,"_311":312,"_313":314,"_315":316,"_317":318,"_319":320,"_321":322},"showContactAdmin",1783955850759,[],[],[297,298,299,300,301],{"_45":60,"_47":70,"_49":102,"_51":-5,"_53":-5,"_55":56},{"_45":60,"_47":69,"_49":102,"_51":-5,"_53":-5,"_55":56},{"_45":60,"_47":61,"_49":102,"_51":-5,"_53":-5,"_55":56},{"_45":57,"_47":58,"_49":102,"_51":-5,"_53":-5,"_55":56},{"_45":46,"_47":48,"_49":50,"_51":52,"_53":302,"_55":56},17,"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. The information collected might relate to you, your preferences, or your device. We use that information to make the site work, analyze performance and traffic on our website, provide a more personalized web experience, and assist in our marketing efforts.

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