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Running
on
T4
| """ | |
| taken and adapted from https://github.com/as-ideas/DeepForcedAligner | |
| """ | |
| import matplotlib.pyplot as plt | |
| import numpy as np | |
| import torch | |
| import torch.multiprocessing | |
| import torch.nn as nn | |
| from torch.nn import CTCLoss | |
| from torch.nn.utils.rnn import pack_padded_sequence | |
| from torch.nn.utils.rnn import pad_packed_sequence | |
| from Preprocessing.TextFrontend import ArticulatoryCombinedTextFrontend | |
| class BatchNormConv(nn.Module): | |
| def __init__(self, in_channels: int, out_channels: int, kernel_size: int): | |
| super().__init__() | |
| self.conv = nn.Conv1d( | |
| in_channels, out_channels, kernel_size, | |
| stride=1, padding=kernel_size // 2, bias=False) | |
| self.bnorm = nn.BatchNorm1d(out_channels) | |
| self.relu = nn.ReLU() | |
| def forward(self, x): | |
| x = x.transpose(1, 2) | |
| x = self.conv(x) | |
| x = self.relu(x) | |
| x = self.bnorm(x) | |
| x = x.transpose(1, 2) | |
| return x | |
| class Aligner(torch.nn.Module): | |
| def __init__(self, | |
| n_features=128, | |
| num_symbols=145, | |
| lstm_dim=512, | |
| conv_dim=512): | |
| super().__init__() | |
| self.convs = nn.ModuleList([ | |
| BatchNormConv(n_features, conv_dim, 3), | |
| nn.Dropout(p=0.5), | |
| BatchNormConv(conv_dim, conv_dim, 3), | |
| nn.Dropout(p=0.5), | |
| BatchNormConv(conv_dim, conv_dim, 3), | |
| nn.Dropout(p=0.5), | |
| BatchNormConv(conv_dim, conv_dim, 3), | |
| nn.Dropout(p=0.5), | |
| BatchNormConv(conv_dim, conv_dim, 3), | |
| nn.Dropout(p=0.5), | |
| ]) | |
| self.rnn = torch.nn.LSTM(conv_dim, lstm_dim, batch_first=True, bidirectional=True) | |
| self.proj = torch.nn.Linear(2 * lstm_dim, num_symbols) | |
| self.tf = ArticulatoryCombinedTextFrontend(language="eng") | |
| self.ctc_loss = CTCLoss(blank=144, zero_infinity=True) | |
| self.vector_to_id = dict() | |
| def forward(self, x, lens=None): | |
| for conv in self.convs: | |
| x = conv(x) | |
| if lens is not None: | |
| x = pack_padded_sequence(x, lens.cpu(), batch_first=True, enforce_sorted=False) | |
| x, _ = self.rnn(x) | |
| if lens is not None: | |
| x, _ = pad_packed_sequence(x, batch_first=True) | |
| x = self.proj(x) | |
| return x | |
| def inference(self, features, tokens, save_img_for_debug=None, train=False, pathfinding="MAS", return_ctc=False): | |
| if not train: | |
| tokens_indexed = self.tf.text_vectors_to_id_sequence(text_vector=tokens) # first we need to convert the articulatory vectors to IDs, so we can apply dijkstra or viterbi | |
| tokens = np.asarray(tokens_indexed) | |
| else: | |
| tokens = tokens.cpu().detach().numpy() | |
| pred = self(features.unsqueeze(0)) | |
| if return_ctc: | |
| ctc_loss = self.ctc_loss(pred.transpose(0, 1).log_softmax(2), torch.LongTensor(tokens), torch.LongTensor([len(pred[0])]), | |
| torch.LongTensor([len(tokens)])).item() | |
| pred = pred.squeeze().cpu().detach().numpy() | |
| pred_max = pred[:, tokens] | |
| # run monotonic alignment search | |
| alignment_matrix = binarize_alignment(pred_max) | |
| if save_img_for_debug is not None: | |
| phones = list() | |
| for index in tokens: | |
| for phone in self.tf.phone_to_id: | |
| if self.tf.phone_to_id[phone] == index: | |
| phones.append(phone) | |
| fig, ax = plt.subplots(nrows=1, ncols=1, figsize=(10, 5)) | |
| ax.imshow(alignment_matrix, interpolation='nearest', aspect='auto', origin="lower", cmap='cividis') | |
| ax.set_ylabel("Mel-Frames") | |
| ax.set_xticks(range(len(pred_max[0]))) | |
| ax.set_xticklabels(labels=phones) | |
| ax.set_title("MAS Path") | |
| plt.tight_layout() | |
| fig.savefig(save_img_for_debug) | |
| fig.clf() | |
| plt.close() | |
| if return_ctc: | |
| return alignment_matrix, ctc_loss | |
| return alignment_matrix | |
| def binarize_alignment(alignment_prob): | |
| """ | |
| # Implementation by: | |
| # https://github.com/NVIDIA/DeepLearningExamples/blob/master/PyTorch/SpeechSynthesis/FastPitch/fastpitch/alignment.py | |
| # https://github.com/NVIDIA/DeepLearningExamples/blob/master/PyTorch/SpeechSynthesis/FastPitch/fastpitch/attn_loss_function.py | |
| Binarizes alignment with MAS. | |
| """ | |
| # assumes features x text | |
| opt = np.zeros_like(alignment_prob) | |
| alignment_prob = alignment_prob + (np.abs(alignment_prob).max() + 1.0) # make all numbers positive and add an offset to avoid log of 0 later | |
| alignment_prob * alignment_prob * (1.0 / alignment_prob.max()) # normalize to (0, 1] | |
| attn_map = np.log(alignment_prob) | |
| attn_map[0, 1:] = -np.inf | |
| log_p = np.zeros_like(attn_map) | |
| log_p[0, :] = attn_map[0, :] | |
| prev_ind = np.zeros_like(attn_map, dtype=np.int64) | |
| for i in range(1, attn_map.shape[0]): | |
| for j in range(attn_map.shape[1]): # for each text dim | |
| prev_log = log_p[i - 1, j] | |
| prev_j = j | |
| if j - 1 >= 0 and log_p[i - 1, j - 1] >= log_p[i - 1, j]: | |
| prev_log = log_p[i - 1, j - 1] | |
| prev_j = j - 1 | |
| log_p[i, j] = attn_map[i, j] + prev_log | |
| prev_ind[i, j] = prev_j | |
| # now backtrack | |
| curr_text_idx = attn_map.shape[1] - 1 | |
| for i in range(attn_map.shape[0] - 1, -1, -1): | |
| opt[i, curr_text_idx] = 1 | |
| curr_text_idx = prev_ind[i, curr_text_idx] | |
| opt[0, curr_text_idx] = 1 | |
| return opt | |
| if __name__ == '__main__': | |
| tf = ArticulatoryCombinedTextFrontend(language="eng") | |
| from Preprocessing.HiFiCodecAudioPreprocessor import CodecAudioPreprocessor | |
| cap = CodecAudioPreprocessor(input_sr=-1) | |
| dummy_codebook_indexes = torch.randint(low=0, high=1023, size=[9, 20]) | |
| codebook_frames = cap.indexes_to_codec_frames(dummy_codebook_indexes) | |
| alignment = Aligner().inference(codebook_frames.transpose(0, 1), tokens=tf.string_to_tensor("Hello world")) | |
| print(alignment.shape) | |
| plt.imshow(alignment, origin="lower", cmap="GnBu") | |
| plt.show() | |