TLT - Conversational AI
What is Transfer Learning Toolkit?
Transfer Learning Toolkit (TLT) is a python based AI toolkit for taking purpose-built pre-trained AI models and customizing them with your own data. TLT adapts popular network architectures and backbones to your data, allowing you to train, fine-tune, and export highly optimized and accurate AI models for deployment.
The pre-trained models accelerate the AI training process and reduce costs associated with large scale data collection, labeling, and training models from scratch.
Build end-to-end services and solutions for conversational AI using TLT and Riva. TLT can train models for common conversational AI tasks such as text classification, question answering, speech recognition, and others.
Purpose-built Pre-Trained Models
Purpose-built pre-trained models offer highly accurate AI for a variety of conversational AI tasks. Developers, system builders, and software partners building conversational AI applications can bring their own custom data to train and fine-tune with using these models, instead of going through the hassle of building a large data collection and training from scratch.
The purpose-built models are available on NGC. Under each model card, there is a version that can be deployed as is and a version which can be used with TLT to fine-tune with your own dataset. Models here can be used for Automatic Speech Recognition (ASR), Question Answering (QA), Domain Classification, Named Entity Recognition (NER), Punctuation and Capitalization, and Joint Intent and Slot Classification. See each model card for information about how to fine-tune and evaluate on your data.
| Model | Accuracy Metric(s) | Use Case | |
|---|---|---|---|
| ASR: Jasper (English) | 3.74%/10.21% WER (LibriSpeech dev-clean/dev-other) | English speech recognition | |
| ASR: QuartzNet (English) | 4.38%/11.30% WER (LibriSpeech dev-clean/dev-other) | English speech recognition (smaller model) | |
| ASR: Citrinet (English) | 4.38%/11.30% WER (LibriSpeech dev-clean/dev-other) | English speech recognition | |
| QA: Bert Base (SQuAD2.0) | 73.35% EM score, 76.44 F1 score | Question answering | |
| QA: Bert Large (SQuAD2.0) | 77.16% EM score, 80.22% F1 score | Question answering | |
| QA: Bert Megatron (SQuAD2.0) | 78.0% EM score, 81.35% F1 score | Question answering | |
| Domain Classification: BERT | 90% accuracy for 4 domains of the weather chatbot | Text classification problems (e.g. sentiment analysis, domain detection) | |
| Punctuation and Capitalization: BERT | 77% F1 score | Punctuation and capitalization of ASR output | |
| NER: BERT | 74.21% F1 score | Named entity recognition and other token-level classification tasks | |
| Joint Intent and Slot Classification: BERT | 95% intent accuracy, 93% slot accuracy | Classifying intent and detecting relevant slots in a query |
Running Transfer Learning Toolkit
Setup your python environment using python
virtualenvandvirtualenvwrapper.In TLT3.0, we have created an abstraction above the container, you will launch all your training jobs from the launcher. No need to manually pull the appropriate container, tlt-launcher will handle that. You may install the launcher using pip with the following commands.
pip3 install nvidia-pyindex
pip3 install nvidia-tlt
- Download one of the Jupyter notebooks that you are interested in from NGC resources. For each task, there is a training notebook as well as a deployment notebook. After installing the pre-requisites, all the training/deployment steps will be run from inside the Jupyter notebook.
| Conversational AI Task | Jupyter Notebooks |
|---|---|
| Automatic Speech Recognition | Resources |
| Automatic Speech Recognition - Citrinet | Resources |
| Question Answering | Resources |
| Text Classification | Resources |
| Named Entity Recognition | Resources |
| Punctuation and Capitalization | Resources |
| Intent and Slot Classification | Resources |
Using TLT Pre-trained Models
Pre-trained models for each Conversational AI task can be found under their respective collections here:
- Automatic Speech Recognition
- Question Answering
- Text Classification
- Punctuation and Capitalization
- Named Entity Recognition
- Intent and Slot Classification
License
By pulling and using the Transfer Learning Tookit for Conversational AI container, you accept the terms and conditions of this license. By downloading and using the models and resources packaged with TLT Conversational AI, you would be accepting the terms of the Riva license.
Technical blogs
Suggested reading
- More information on about Transfer learning toolkit and pre-trained models can be found at the NVIDIA Developer Zone
- Read the TLT Getting Started guide and release notes.
- If you have any questions or feedback, please refer to the discussions on TLT Developer Forums
Ethical AI
NVIDIAâs platforms and application frameworks enable developers to build a wide array of AI applications. Consider potential algorithmic bias when choosing or creating the models being deployed. Work with the modelâs developer to ensure that it meets the requirements for the relevant industry and use case; that 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.