341 lines
12 KiB
Python
341 lines
12 KiB
Python
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import copy
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from typing import Optional
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from typing import Tuple
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from typing import Union
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import logging
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import numpy as np
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import torch
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import torch.nn as nn
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try:
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from torch_complex.tensor import ComplexTensor
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except:
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print("Please install torch_complex firstly")
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from funasr.frontends.utils.log_mel import LogMel
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from funasr.frontends.utils.stft import Stft
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from funasr.frontends.utils.frontend import Frontend
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from funasr.models.transformer.utils.nets_utils import make_pad_mask
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from funasr.register import tables
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@tables.register("frontend_classes", "DefaultFrontend")
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class DefaultFrontend(nn.Module):
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"""Conventional frontend structure for ASR.
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Stft -> WPE -> MVDR-Beamformer -> Power-spec -> Mel-Fbank -> CMVN
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"""
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def __init__(
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self,
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fs: int = 16000,
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n_fft: int = 512,
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win_length: int = None,
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hop_length: int = 128,
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window: Optional[str] = "hann",
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center: bool = True,
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normalized: bool = False,
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onesided: bool = True,
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n_mels: int = 80,
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fmin: int = None,
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fmax: int = None,
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htk: bool = False,
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frontend_conf: Optional[dict] = None,
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apply_stft: bool = True,
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use_channel: int = None,
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**kwargs,
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):
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super().__init__()
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# Deepcopy (In general, dict shouldn't be used as default arg)
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frontend_conf = copy.deepcopy(frontend_conf)
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self.hop_length = hop_length
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self.fs = fs
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if apply_stft:
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self.stft = Stft(
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n_fft=n_fft,
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win_length=win_length,
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hop_length=hop_length,
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center=center,
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window=window,
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normalized=normalized,
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onesided=onesided,
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)
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else:
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self.stft = None
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self.apply_stft = apply_stft
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if frontend_conf is not None:
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self.frontend = Frontend(idim=n_fft // 2 + 1, **frontend_conf)
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else:
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self.frontend = None
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self.logmel = LogMel(
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fs=fs,
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n_fft=n_fft,
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n_mels=n_mels,
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fmin=fmin,
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fmax=fmax,
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htk=htk,
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)
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self.n_mels = n_mels
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self.use_channel = use_channel
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self.frontend_type = "default"
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def output_size(self) -> int:
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return self.n_mels
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def forward(
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self, input: torch.Tensor, input_lengths: Union[torch.Tensor, list]
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) -> Tuple[torch.Tensor, torch.Tensor]:
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if isinstance(input_lengths, list):
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input_lengths = torch.tensor(input_lengths)
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if input.dtype == torch.float64:
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input = input.float()
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# 1. Domain-conversion: e.g. Stft: time -> time-freq
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if self.stft is not None:
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input_stft, feats_lens = self._compute_stft(input, input_lengths)
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else:
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input_stft = ComplexTensor(input[..., 0], input[..., 1])
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feats_lens = input_lengths
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# 2. [Option] Speech enhancement
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if self.frontend is not None:
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assert isinstance(input_stft, ComplexTensor), type(input_stft)
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# input_stft: (Batch, Length, [Channel], Freq)
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input_stft, _, mask = self.frontend(input_stft, feats_lens)
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# 3. [Multi channel case]: Select a channel
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if input_stft.dim() == 4:
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# h: (B, T, C, F) -> h: (B, T, F)
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if self.training:
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if self.use_channel is not None:
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input_stft = input_stft[:, :, self.use_channel, :]
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else:
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# Select 1ch randomly
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ch = np.random.randint(input_stft.size(2))
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input_stft = input_stft[:, :, ch, :]
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else:
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# Use the first channel
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input_stft = input_stft[:, :, 0, :]
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# 4. STFT -> Power spectrum
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# h: ComplexTensor(B, T, F) -> torch.Tensor(B, T, F)
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input_power = input_stft.real**2 + input_stft.imag**2
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# 5. Feature transform e.g. Stft -> Log-Mel-Fbank
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# input_power: (Batch, [Channel,] Length, Freq)
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# -> input_feats: (Batch, Length, Dim)
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input_feats, _ = self.logmel(input_power, feats_lens)
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return input_feats, feats_lens
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def _compute_stft(self, input: torch.Tensor, input_lengths: torch.Tensor) -> torch.Tensor:
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input_stft, feats_lens = self.stft(input, input_lengths)
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assert input_stft.dim() >= 4, input_stft.shape
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# "2" refers to the real/imag parts of Complex
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assert input_stft.shape[-1] == 2, input_stft.shape
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# Change torch.Tensor to ComplexTensor
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# input_stft: (..., F, 2) -> (..., F)
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input_stft = ComplexTensor(input_stft[..., 0], input_stft[..., 1])
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return input_stft, feats_lens
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class MultiChannelFrontend(nn.Module):
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"""Conventional frontend structure for ASR.
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Stft -> WPE -> MVDR-Beamformer -> Power-spec -> Mel-Fbank -> CMVN
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"""
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def __init__(
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self,
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fs: int = 16000,
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n_fft: int = 512,
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win_length: int = None,
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hop_length: int = None,
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frame_length: int = None,
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frame_shift: int = None,
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window: Optional[str] = "hann",
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center: bool = True,
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normalized: bool = False,
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onesided: bool = True,
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n_mels: int = 80,
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fmin: int = None,
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fmax: int = None,
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htk: bool = False,
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frontend_conf: Optional[dict] = None,
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apply_stft: bool = True,
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use_channel: int = None,
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lfr_m: int = 1,
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lfr_n: int = 1,
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cmvn_file: str = None,
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mc: bool = True,
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):
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super().__init__()
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# Deepcopy (In general, dict shouldn't be used as default arg)
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frontend_conf = copy.deepcopy(frontend_conf)
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if win_length is None and hop_length is None:
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self.win_length = frame_length * 16
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self.hop_length = frame_shift * 16
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elif frame_length is None and frame_shift is None:
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self.win_length = self.win_length
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self.hop_length = self.hop_length
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else:
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logging.error(
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"Only one of (win_length, hop_length) and (frame_length, frame_shift)" "can be set."
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)
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exit(1)
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if apply_stft:
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self.stft = Stft(
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n_fft=n_fft,
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win_length=self.win_length,
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hop_length=self.hop_length,
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center=center,
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window=window,
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normalized=normalized,
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onesided=onesided,
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)
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else:
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self.stft = None
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self.apply_stft = apply_stft
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if frontend_conf is not None:
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self.frontend = Frontend(idim=n_fft // 2 + 1, **frontend_conf)
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else:
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self.frontend = None
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self.logmel = LogMel(
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fs=fs,
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n_fft=n_fft,
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n_mels=n_mels,
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fmin=fmin,
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fmax=fmax,
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htk=htk,
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)
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self.n_mels = n_mels
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self.use_channel = use_channel
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self.mc = mc
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if not self.mc:
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if self.use_channel is not None:
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logging.info("use the channel %d" % (self.use_channel))
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else:
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logging.info("random select channel")
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self.cmvn_file = cmvn_file
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if self.cmvn_file is not None:
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mean, std = self._load_cmvn(self.cmvn_file)
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self.register_buffer("mean", torch.from_numpy(mean))
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self.register_buffer("std", torch.from_numpy(std))
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self.frontend_type = "multichannelfrontend"
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def output_size(self) -> int:
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return self.n_mels
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def forward(
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self, input: torch.Tensor, input_lengths: torch.Tensor
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) -> Tuple[torch.Tensor, torch.Tensor]:
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# 1. Domain-conversion: e.g. Stft: time -> time-freq
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# import pdb;pdb.set_trace()
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if self.stft is not None:
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input_stft, feats_lens = self._compute_stft(input, input_lengths)
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else:
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input_stft = ComplexTensor(input[..., 0], input[..., 1])
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feats_lens = input_lengths
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# 2. [Option] Speech enhancement
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if self.frontend is not None:
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assert isinstance(input_stft, ComplexTensor), type(input_stft)
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# input_stft: (Batch, Length, [Channel], Freq)
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input_stft, _, mask = self.frontend(input_stft, feats_lens)
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# 3. [Multi channel case]: Select a channel(sa_asr)
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if input_stft.dim() == 4 and not self.mc:
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# h: (B, T, C, F) -> h: (B, T, F)
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if self.training:
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if self.use_channel is not None:
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input_stft = input_stft[:, :, self.use_channel, :]
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else:
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# Select 1ch randomly
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ch = np.random.randint(input_stft.size(2))
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input_stft = input_stft[:, :, ch, :]
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else:
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# Use the first channel
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input_stft = input_stft[:, :, 0, :]
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# 4. STFT -> Power spectrum
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# h: ComplexTensor(B, T, F) -> torch.Tensor(B, T, F)
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input_power = input_stft.real**2 + input_stft.imag**2
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# 5. Feature transform e.g. Stft -> Log-Mel-Fbank
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# input_power: (Batch, [Channel,] Length, Freq)
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# -> input_feats: (Batch, Length, Dim)
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input_feats, _ = self.logmel(input_power, feats_lens)
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if self.mc:
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# MFCCA
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if input_feats.dim() == 4:
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bt = input_feats.size(0)
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channel_size = input_feats.size(2)
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input_feats = (
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input_feats.transpose(1, 2).reshape(bt * channel_size, -1, 80).contiguous()
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)
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feats_lens = feats_lens.repeat(1, channel_size).squeeze()
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else:
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channel_size = 1
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return input_feats, feats_lens, channel_size
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else:
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# 6. Apply CMVN
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if self.cmvn_file is not None:
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if feats_lens is None:
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feats_lens = input_feats.new_full([input_feats.size(0)], input_feats.size(1))
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self.mean = self.mean.to(input_feats.device, input_feats.dtype)
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self.std = self.std.to(input_feats.device, input_feats.dtype)
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mask = make_pad_mask(feats_lens, input_feats, 1)
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if input_feats.requires_grad:
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input_feats = input_feats + self.mean
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else:
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input_feats += self.mean
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if input_feats.requires_grad:
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input_feats = input_feats.masked_fill(mask, 0.0)
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else:
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input_feats.masked_fill_(mask, 0.0)
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input_feats *= self.std
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return input_feats, feats_lens
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def _compute_stft(self, input: torch.Tensor, input_lengths: torch.Tensor) -> torch.Tensor:
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input_stft, feats_lens = self.stft(input, input_lengths)
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assert input_stft.dim() >= 4, input_stft.shape
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# "2" refers to the real/imag parts of Complex
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assert input_stft.shape[-1] == 2, input_stft.shape
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# Change torch.Tensor to ComplexTensor
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# input_stft: (..., F, 2) -> (..., F)
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input_stft = ComplexTensor(input_stft[..., 0], input_stft[..., 1])
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return input_stft, feats_lens
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def _load_cmvn(self, cmvn_file):
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with open(cmvn_file, "r", encoding="utf-8") as f:
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lines = f.readlines()
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means_list = []
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vars_list = []
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for i in range(len(lines)):
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line_item = lines[i].split()
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if line_item[0] == "<AddShift>":
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line_item = lines[i + 1].split()
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if line_item[0] == "<LearnRateCoef>":
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add_shift_line = line_item[3 : (len(line_item) - 1)]
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means_list = list(add_shift_line)
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continue
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elif line_item[0] == "<Rescale>":
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line_item = lines[i + 1].split()
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if line_item[0] == "<LearnRateCoef>":
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rescale_line = line_item[3 : (len(line_item) - 1)]
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vars_list = list(rescale_line)
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continue
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means = np.array(means_list).astype(np.float)
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vars = np.array(vars_list).astype(np.float)
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return means, vars
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