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290 lines
8.1 KiB
Markdown
290 lines
8.1 KiB
Markdown
# kaldifeat
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<div align="center">
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<img src="/doc/source/images/os-green.svg">
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<img src="/doc/source/images/python_ge_3.6-blue.svg">
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<img src="/doc/source/images/pytorch_ge_1.5.0-green.svg">
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<img src="/doc/source/images/cuda_ge_10.1-orange.svg">
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</div>
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[](https://csukuangfj.github.io/kaldifeat/)
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**Documentation**: <https://csukuangfj.github.io/kaldifeat>
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**Note**: If you are looking for a version that does not depend on PyTorch,
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please see <https://github.com/csukuangfj/kaldi-native-fbank>
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<sub>
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<table>
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<tr>
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<th>Comments</th>
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<th>Options</th>
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<th>Feature Computer</th>
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<th>Usage</th>
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</tr>
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<tr>
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<td>FBANK</td>
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<td><code>kaldifeat.FbankOptions</code></td>
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<td><code>kaldifeat.Fbank</code></td>
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<td>
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<pre lang="python">
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opts = kaldifeat.FbankOptions()
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opts.device = torch.device('cuda', 0)
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opts.frame_opts.window_type = 'povey'
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fbank = kaldifeat.Fbank(opts)
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features = fbank(wave)
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</pre>
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</td>
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</tr>
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<tr>
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<td>Streaming FBANK</td>
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<td><code>kaldifeat.FbankOptions</code></td>
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<td><code>kaldifeat.OnlineFbank</code></td>
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<td>
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See <a href="./kaldifeat/python/tests/test_fbank.py">
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./kaldifeat/python/tests/test_fbank.py
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</a>
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</td>
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</tr>
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<tr>
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<td>MFCC</td>
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<td><code>kaldifeat.MfccOptions</code></td>
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<td><code>kaldifeat.Mfcc</code></td>
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<td>
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<pre lang="python">
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opts = kaldifeat.MfccOptions();
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opts.num_ceps = 13
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mfcc = kaldifeat.Mfcc(opts)
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features = mfcc(wave)
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</pre>
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</td>
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</tr>
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<tr>
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<td>Streaming MFCC</td>
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<td><code>kaldifeat.MfccOptions</code></td>
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<td><code>kaldifeat.OnlineMfcc</code></td>
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<td>
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See <a href="./kaldifeat/python/tests/test_mfcc.py">
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./kaldifeat/python/tests/test_mfcc.py
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</a>
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</td>
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</tr>
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<tr>
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<td>PLP</td>
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<td><code>kaldifeat.PlpOptions</code></td>
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<td><code>kaldifeat.Plp</code></td>
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<td>
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<pre lang="python">
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opts = kaldifeat.PlpOptions();
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opts.mel_opts.num_bins = 23
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plp = kaldifeat.Plp(opts)
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features = plp(wave)
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</pre>
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</td>
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</tr>
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<tr>
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<td>Streaming PLP</td>
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<td><code>kaldifeat.PlpOptions</code></td>
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<td><code>kaldifeat.OnlinePlp</code></td>
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<td>
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See <a href="./kaldifeat/python/tests/test_plp.py">
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./kaldifeat/python/tests/test_plp.py
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</a>
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</td>
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</tr>
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<tr>
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<td>Spectorgram</td>
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<td><code>kaldifeat.SpectrogramOptions</code></td>
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<td><code>kaldifeat.Spectrogram</code></td>
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<td>
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<pre lang="python">
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opts = kaldifeat.SpectrogramOptions();
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print(opts)
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spectrogram = kaldifeat.Spectrogram(opts)
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features = spectrogram(wave)
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</pre>
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</td>
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</tr>
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</table>
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</sub>
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Feature extraction compatible with `Kaldi` using PyTorch, supporting
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CUDA, batch processing, chunk processing, and autograd.
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The following kaldi-compatible commandline tools are implemented:
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- `compute-fbank-feats`
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- `compute-mfcc-feats`
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- `compute-plp-feats`
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- `compute-spectrogram-feats`
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(**NOTE**: We will implement other types of features, e.g., Pitch, ivector, etc, soon.)
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**HINT**: It supports also streaming feature extractors for Fbank, MFCC, and Plp.
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# Usage
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Let us first generate a test wave using sox:
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```bash
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# generate a wave of 1.2 seconds, containing a sine-wave
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# swept from 300 Hz to 3300 Hz
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sox -n -r 16000 -b 16 test.wav synth 1.2 sine 300-3300
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```
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**HINT**: Download [test.wav][test_wav].
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[test_wav]: kaldifeat/python/tests/test_data/test.wav
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## Fbank
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```python
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import torchaudio
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import kaldifeat
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filename = "./test.wav"
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wave, samp_freq = torchaudio.load(filename)
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wave = wave.squeeze()
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opts = kaldifeat.FbankOptions()
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opts.frame_opts.dither = 0
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# Yes, it has same options like `Kaldi`
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fbank = kaldifeat.Fbank(opts)
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features = fbank(wave)
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```
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To compute features that are compatible with `Kaldi`, wave samples have to be
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scaled to the range `[-32768, 32768]`. **WARNING**: You don't have to do this if
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you don't care about the compatibility with `Kaldi`.
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The following is an example:
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```python
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wave *= 32768
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fbank = kaldifeat.Fbank(opts)
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features = fbank(wave)
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print(features[:3])
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```
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The output is:
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```
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tensor([[15.0074, 21.1730, 25.5286, 24.4644, 16.6994, 13.8480, 11.2087, 11.7952,
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10.3911, 10.4491, 10.3012, 9.8743, 9.6997, 9.3751, 9.3476, 9.3559,
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9.1074, 9.0032, 9.0312, 8.8399, 9.0822, 8.7442, 8.4023],
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[13.8785, 20.5647, 25.4956, 24.6966, 16.9541, 13.9163, 11.3364, 11.8449,
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10.2565, 10.5871, 10.3484, 9.7474, 9.6123, 9.3964, 9.0695, 9.1177,
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8.9136, 8.8425, 8.5920, 8.8315, 8.6226, 8.8605, 8.9763],
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[13.9475, 19.9410, 25.4494, 24.9051, 17.0004, 13.9207, 11.6667, 11.8217,
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10.3411, 10.7258, 10.0983, 9.8109, 9.6762, 9.4218, 9.1246, 8.7744,
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9.0863, 8.7488, 8.4695, 8.6710, 8.7728, 8.7405, 8.9824]])
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```
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You can compute the fbank feature for the same wave with `Kaldi` using the following commands:
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```bash
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echo "1 test.wav" > test.scp
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compute-fbank-feats --dither=0 scp:test.scp ark,t:test.txt
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head -n4 test.txt
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```
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The output is:
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```
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1 [
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15.00744 21.17303 25.52861 24.46438 16.69938 13.84804 11.2087 11.79517 10.3911 10.44909 10.30123 9.874329 9.699727 9.37509 9.347578 9.355928 9.107419 9.00323 9.031268 8.839916 9.082197 8.744139 8.40221
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13.87853 20.56466 25.49562 24.69662 16.9541 13.91633 11.33638 11.84495 10.25656 10.58718 10.34841 9.747416 9.612316 9.39642 9.06955 9.117751 8.913527 8.842571 8.59212 8.831518 8.622513 8.86048 8.976251
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13.94753 19.94101 25.4494 24.90511 17.00044 13.92074 11.66673 11.82172 10.34108 10.72575 10.09829 9.810879 9.676199 9.421767 9.124647 8.774353 9.086291 8.74897 8.469534 8.670973 8.772754 8.740549 8.982433
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```
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You can see that ``kaldifeat`` produces the same output as `Kaldi` (within some tolerance due to numerical precision).
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**HINT**: Download [test.scp][test_scp] and [test.txt][test_txt].
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[test_scp]: kaldifeat/python/tests/test_data/test.scp
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[test_txt]: kaldifeat/python/tests/test_data/test.txt
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To use GPU, you can use:
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```python
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import torch
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opts = kaldifeat.FbankOptions()
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opts.device = torch.device("cuda", 0)
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fbank = kaldifeat.Fbank(opts)
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features = fbank(wave.to(opts.device))
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```
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## MFCC, PLP, Spectrogram
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To compute MFCC features, please replace `kaldifeat.FbankOptions` and `kaldifeat.Fbank`
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with `kaldifeat.MfccOptions` and `kaldifeat.Mfcc`, respectively. The same goes
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for `PLP` and `Spectrogram`.
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Please refer to
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- [kaldifeat/python/tests/test_fbank.py](kaldifeat/python/tests/test_fbank.py)
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- [kaldifeat/python/tests/test_mfcc.py](kaldifeat/python/tests/test_mfcc.py)
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- [kaldifeat/python/tests/test_plp.py](kaldifeat/python/tests/test_plp.py)
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- [kaldifeat/python/tests/test_spectrogram.py](kaldifeat/python/tests/test_spectrogram.py)
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- [kaldifeat/python/tests/test_frame_extraction_options.py](kaldifeat/python/tests/test_frame_extraction_options.py)
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- [kaldifeat/python/tests/test_mel_bank_options.py](kaldifeat/python/tests/test_mel_bank_options.py)
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- [kaldifeat/python/tests/test_fbank_options.py](kaldifeat/python/tests/test_fbank_options.py)
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- [kaldifeat/python/tests/test_mfcc_options.py](kaldifeat/python/tests/test_mfcc_options.py)
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- [kaldifeat/python/tests/test_spectrogram_options.py](kaldifeat/python/tests/test_spectrogram_options.py)
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- [kaldifeat/python/tests/test_plp_options.py](kaldifeat/python/tests/test_plp_options.py)
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for more examples.
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**HINT**: In the examples, you can find that
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- ``kaldifeat`` supports batch processing as well as chunk processing
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- ``kaldifeat`` uses the same options as `Kaldi`'s `compute-fbank-feats` and `compute-mfcc-feats`
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# Usage in other projects
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## icefall
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[icefall](https://github.com/k2-fsa/icefall) uses kaldifeat to extract features for a pre-trained model.
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See <https://github.com/k2-fsa/icefall/blob/master/egs/librispeech/ASR/conformer_ctc/pretrained.py>.
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## k2
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[k2](https://github.com/k2-fsa/k2) uses kaldifeat's C++ API.
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See <https://github.com/k2-fsa/k2/blob/v2.0-pre/k2/torch/csrc/features.cu>.
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## lhotse
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[lhotse](https://github.com/lhotse-speech/lhotse) uses kaldifeat to extract features on GPU.
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See <https://github.com/lhotse-speech/lhotse/blob/master/lhotse/features/kaldifeat.py>.
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## sherpa
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[sherpa](https://github.com/k2-fsa/sherpa) uses kaldifeat for streaming feature
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extraction.
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See <https://github.com/k2-fsa/sherpa/blob/master/sherpa/bin/pruned_stateless_emformer_rnnt2/decode.py>
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# Installation
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Refer to
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<https://csukuangfj.github.io/kaldifeat>
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for installation.
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