CrafyWakeWord

CrafyWakeWord it's a library focused on AI-based wake word recognition.

⭐ Features and functions

• Custom wake word recognition.
• Multiple language support.
• Models portable to other platforms.
• TensorFlow and TensorFlow.js supported.
• Step by step explanation.

Demo

You can see an online demo here:

• English demo: https://chijete.github.io/CrafyWakeWord_demo/en/
• Spanish demo: https://chijete.github.io/CrafyWakeWord_demo/es/

Use pre-trained models

You can download pre-trained models in multiple languages ​​from this repository: https://github.com/chijete/CrafyWakeWord_models

Tip: If you want to download a single model and not clone the entire repository, you can use this tool to download a single folder from a git repository: https://download-directory.github.io/

Create your own model

With this tool you can create your custom wake word detection model. For example, you can create a model to detect when the user says the word "banana", and then run your own code accordingly.

Prerequisites

• Have Python 3 installed.
• Have Miniconda or Anaconda installed.
• Have a verified Google Cloud account (we will use the Google Cloud text-to-speech api to improve the dataset, more information below; the free plan is enough).

1. Download voice dataset

The first step is to obtain a dataset of transcribed audios. In this library we will use Mozilla Common Voice to obtain the dataset.

Follow these steps:

1. Access to https://commonvoice.mozilla.org/en/datasets
2. Select the target language from the Language selector.
3. Select the last "Common Voice Corpus" version (Do not select "Delta Segment").
4. Enter an email, accept the terms and download the file.

2. Clone this repository

1. Clone this repository to a folder on your computer using git, or download and unzip this repository using Github's "Code > Download ZIP" option.
2. Unzip the downloaded Mozilla Common Voice file and copy the "cv-corpus-..." folder to the folder where you cloned the repository.

3. Install dependencies

Run this commands in your terminal (conda activate first) or Anaconda terminal:

• pip install librosa textgrid torchsummary ffmpeg-python pocketsphinx fastprogress chardet PyAudio clang pgvector hdbscan initdb speechbrain
• pip install --upgrade google-cloud-texttospeech
• pip install --only-binary :all: pynini or conda install conda-forge::pynini
• conda install -c conda-forge kalpy
• pip install montreal-forced-aligner
• conda install -c conda-forge sox
• pip3 install torch torchvision torchaudio --index-url https://download.pytorch.org/whl/cpu (Installing PyTorch with CPU, complete instructions on https://pytorch.org/get-started/locally/ - you can use GPU acceleration).
• pip install ffmpeg onnx tensorflow numpy onnx_tf tensorflow_probability ipython

Install PostgreSQL from https://www.enterprisedb.com/downloads/postgres-postgresql-downloads When the installation is finished, add PostgreSQL to the System Path:

In Windows:

1. Open the Windows Control Panel.
2. Click on "System and Security".
3. Select "System".
4. In the "Advanced system settings" window, click on the "Environment Variables" button under the "Advanced" tab.
5. In the "System variables" section, look for the "Path" variable and click "Edit...".
6. Add the path to the PostgreSQL directory to the end of the list. For example, the path might be something like "C:\Program Files\PostgreSQL\version\bin" (replace "version" with the version of PostgreSQL you installed).

When finished, close the terminal and reopen it to apply the changes.

4. Download aligner model

We will use Montreal Forced Aligner to align the audio files from the Mozilla Common Voice dataset. Follow these steps:

1. Search for an Acoustic model for your model's target language here: https://mfa-models.readthedocs.io/en/latest/acoustic/index.html
2. On the Acoustic model details page, in the Installation section, click "download from the release page".
3. At the bottom of the page on Github, in the Assets section, click on the zip file (the first one in the list) to download it.
4. Return to the Acoustic model page, and in the Pronunciation dictionaries section, click on the first one in the list.
5. On the Pronunciation dictionary details page, in the Installation section, click "download from the release page".
6. At the bottom of the page on Github, in the Assets section, click on the dict file (the first one in the list) to download it.
7. Copy the two downloaded files to the mfa folder within the directory where you cloned the repository.

5. Edit config file

Edit your_config.json file:

• "common_voice_datapath" is the path, relative to the root directory, where the downloaded Mozilla Common Voice files are located. Example: "common_voice_datapath": "corpus/cv-corpus-15.0-2023-09-08/en/"
• "wake_words" is the list of words that your model will learn to recognize.
• "google_credentials_file" is the path, relative to the root directory, where your Google Cloud acccess credentials file is located. You can learn how to get your account credentials JSON file in this help article: https://cloud.google.com/iam/docs/keys-create-delete#creating . You can paste the credentials file in the root directory where you cloned the repository.
• "mfa_DICTIONARY_PATH" is the path, relative to the root directory, where your downloaded Montreal Forced Aligner Pronunciation dictionary file is located.
• "mfa_ACOUSTIC_MODEL_PATH" is the path, relative to the root directory, where your downloaded Montreal Forced Aligner Acoustic model file is located.
• "dataset_language" is the ISO 639-1 code of the target language. Example: "en"
• "window_size_ms" is the number of milliseconds of the model's listening time window.
• "train_epochs" is the number of epochs for which the model will be trained.
• "add_vanilla_noise_to_negative_dataset" determines whether to add the base noise to the negative dataset.

6. Prepare and train the model

Run these commands within your conda environment:

• python dataset_generation.py (sorts Mozilla Common Voice audio files)
• python align.py (runs Montreal Forced Aligner to align the audios)
• python align_manage.py (accommodates the results of Montreal Forced Aligner)
• python train_model.py (generates additional training data using the Google Cloud Text-to-Speech API and applying noise, and prepares and trains the final model)

7. Test the model

You can test the detection of wake words by running the use_model.py file and saying the words in order as shown in the console. (It is necessary to have a microphone connected).

Note: This tutorial is primarily designed for Windows.

Port a model to another platform

The resulting file when creating a model with CrafyWakeWord is a PyTorch model file (.pt). You can port this model to other platforms such as ONNX or TensorFlow.

Port model to ONNX

1. Verify that the PyTorch model is located in the path dataset/model_trained.pt
2. Run this command in the root of the directory where you cloned the repository: python convert_to_onnx.py
3. The ONNX model will be saved in dataset/onnx_model_trained.onnx

Port model to TensorFlow

1. Verify that the PyTorch model is located in the path dataset/model_trained.pt
2. Run this command in the root of the directory where you cloned the repository: python convert_to_onnx.py
3. Run this command: python convert_onnx_to_tf.py
4. The TensorFlow model will be saved in dataset/tf_model_trained, and the TensorFlow Lite model will be saved in dataset/tf_model_trained.tflite

Port model to TensorFlow.js

After porting the model to TensorFlow, run the following commands:

1. conda create -n tfjsconverter python=3.6.8 (only in first execution)
2. conda activate tfjsconverter
3. pip install tensorflowjs[wizard] (only in first execution)
4. tensorflowjs_wizard
   1. ? Please provide the path of model file or the directory that contains model files. dataset/tf_model_trained
   2. ? What is your input model format? Tensorflow Saved Model *
   3. ? What is tags for the saved model? serve
   4. ? What is signature name of the model? serving_default
   5. ? Do you want to compress the model? No compression (Higher accuracy)
   6. ? Please enter shard size (in bytes) of the weight files? 4194304
   7. ? Do you want to skip op validation? No
   8. ? Do you want to strip debug ops? Yes
   9. ? Do you want to enable Control Flow V2 ops? Yes
   10. ? Do you want to provide metadata? ENTER
   11. ? Which directory do you want to save the converted model in? dataset/web_model
5. The TensorFlow.js model will be saved in dataset/web_model

Train another model

Before training a new model for the same trigger words, make a copy and delete the following files/directories:

• dataset/tf_model_trained/
• dataset/web_model/
• dataset/model_data.json
• dataset/model_trained.pt
• dataset/onnx_model_trained.onnx
• dataset/tf_model_trained.tflite
• dataset/zmuv.pt.bin

Before training a completely new model, make sure to make a copy and delete the following files/directories:

• dataset/

You may need to update the contents of the following folders if you change the language:

• corpus/
• mfa/

Credits and thanks

This library was developed following these instructions: https://github.com/rajashekar/WakeWordDetector/

We thank Rajashekar very much for his excellent work and explanation captured here: https://www.rajashekar.org/wake-word/

Additional thanks to:

• Mozilla Common Voice
• Montreal Forced Aligner
• Google Cloud Text-to-Speech API