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81 lines
2.3 KiB
Python
Executable File
81 lines
2.3 KiB
Python
Executable File
#!/usr/bin/env python3
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"""
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This file computes fbank features of the musan dataset.
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Its looks for manifests in the directory data/manifests.
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The generated fbank features are saved in data/fbank.
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"""
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import logging
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import os
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from pathlib import Path
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import torch
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from lhotse import CutSet, Fbank, FbankConfig, LilcomHdf5Writer, combine
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from lhotse.recipes.utils import read_manifests_if_cached
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from icefall.utils import get_executor
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# Torch's multithreaded behavior needs to be disabled or it wastes a lot of CPU and
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# slow things down. Do this outside of main() in case it needs to take effect
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# even when we are not invoking the main (e.g. when spawning subprocesses).
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torch.set_num_threads(1)
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torch.set_num_interop_threads(1)
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def compute_fbank_musan():
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src_dir = Path("data/manifests")
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output_dir = Path("data/fbank")
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num_jobs = min(15, os.cpu_count())
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num_mel_bins = 80
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dataset_parts = (
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"music",
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"speech",
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"noise",
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)
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manifests = read_manifests_if_cached(
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dataset_parts=dataset_parts, output_dir=src_dir
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)
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assert manifests is not None
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musan_cuts_path = output_dir / "cuts_musan.json.gz"
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if musan_cuts_path.is_file():
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logging.info(f"{musan_cuts_path} already exists - skipping")
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return
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logging.info("Extracting features for Musan")
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extractor = Fbank(FbankConfig(num_mel_bins=num_mel_bins))
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with get_executor() as ex: # Initialize the executor only once.
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# create chunks of Musan with duration 5 - 10 seconds
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musan_cuts = (
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CutSet.from_manifests(
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recordings=combine(
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part["recordings"] for part in manifests.values()
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)
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)
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.cut_into_windows(10.0)
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.filter(lambda c: c.duration > 5)
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.compute_and_store_features(
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extractor=extractor,
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storage_path=f"{output_dir}/feats_musan",
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num_jobs=num_jobs if ex is None else 80,
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executor=ex,
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storage_type=LilcomHdf5Writer,
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)
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)
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musan_cuts.to_json(musan_cuts_path)
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if __name__ == "__main__":
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formatter = (
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"%(asctime)s %(levelname)s [%(filename)s:%(lineno)d] %(message)s"
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)
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logging.basicConfig(format=formatter, level=logging.INFO)
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compute_fbank_musan()
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