[TTS] add Chinese TTS recipe based on IPA.

* add new pinyin and ipa dictionaries with 36 finals.
* add yaml configs for 24-final pinyin and ipa.
* add copyright header
* add a directory level 24finals to discriminate from 36 finals.

Signed-off-by: Xuesong Yang <[email protected]>

Author: XuesongYang

examples/tts/conf/zh/fastpitch_align_24finals_22050_ipa.yaml

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+# This config contains the default values for training FastPitch model with aligner using 22KHz sampling
+# rate. If you want to train model on other dataset, you can change config values according to your dataset.
+# Most dataset-specific arguments are in the head of the config file, see below.
+
+name: FastPitch
+
+train_dataset: ???
+validation_datasets: ???
+sup_data_path: ???
+sup_data_types: [ "align_prior_matrix", "pitch" ]
+
+# Default values from librosa.pyin
+pitch_fmin: 65.40639132514966
+pitch_fmax: 1986.977294921875
+
+# these frame-wise values depend on pitch_fmin and pitch_fmax, you can get values
+# by running `scripts/dataset_processing/tts/extract_sup_data.py`
+pitch_mean: ???  # e.g. 221.4948272705078 for SFbilingual dataset.
+pitch_std:  ???  # e.g.  64.6528930664063 for SFbilingual dataset.
+
+# Default values for dataset with sample_rate=22050
+sample_rate: 22050
+n_mel_channels: 80
+n_window_size: 1024
+n_window_stride: 256
+n_fft: 1024
+lowfreq: 0
+highfreq: null
+window: hann
+
+phoneme_dict_path: "scripts/tts_dataset_files/zh/24finals/ipa_dict_nv23.05.txt"
+
+model:
+  learn_alignment: true
+  bin_loss_warmup_epochs: 100
+
+  n_speakers: 1
+  max_token_duration: 75
+  symbols_embedding_dim: 384
+  pitch_embedding_kernel_size: 3
+
+  pitch_fmin: ${pitch_fmin}
+  pitch_fmax: ${pitch_fmax}
+
+  pitch_mean: ${pitch_mean}
+  pitch_std: ${pitch_std}
+
+  sample_rate: ${sample_rate}
+  n_mel_channels: ${n_mel_channels}
+  n_window_size: ${n_window_size}
+  n_window_stride: ${n_window_stride}
+  n_fft: ${n_fft}
+  lowfreq: ${lowfreq}
+  highfreq: ${highfreq}
+  window: ${window}
+
+  text_normalizer:
+    _target_: nemo_text_processing.text_normalization.normalize.Normalizer
+    lang: zh
+    input_case: cased
+
+  text_normalizer_call_kwargs:
+    verbose: false
+    punct_pre_process: true
+    punct_post_process: true
+
+  text_tokenizer:
+    _target_: nemo.collections.common.tokenizers.text_to_speech.tts_tokenizers.ChinesePhonemesTokenizer
+    punct: true
+    apostrophe: true
+    pad_with_space: true
+    g2p:
+      _target_: nemo.collections.tts.g2p.models.zh_cn_pinyin.ChineseG2p
+      phoneme_dict: ${phoneme_dict_path}
+      word_segmenter: jieba # Only jieba is supported now.
+      phoneme_prefix: ""
+      phoneme_case: lower
+      tone_prefix: "#"
+      ascii_letter_prefix: ""
+      ascii_letter_case: upper
+
+  train_ds:
+    dataset:
+      _target_: nemo.collections.tts.data.dataset.TTSDataset
+      manifest_filepath: ${train_dataset}
+      sample_rate: ${model.sample_rate}
+      sup_data_path: ${sup_data_path}
+      sup_data_types: ${sup_data_types}
+      n_fft: ${model.n_fft}
+      win_length: ${model.n_window_size}
+      hop_length: ${model.n_window_stride}
+      window: ${model.window}
+      n_mels: ${model.n_mel_channels}
+      lowfreq: ${model.lowfreq}
+      highfreq: ${model.highfreq}
+      max_duration: null # change to null to include longer audios.
+      min_duration: 0.1
+      ignore_file: null
+      trim: true
+      trim_top_db: 50
+      trim_frame_length: ${model.n_window_size}
+      trim_hop_length: ${model.n_window_stride}
+      pitch_fmin: ${model.pitch_fmin}
+      pitch_fmax: ${model.pitch_fmax}
+      pitch_norm: true
+      pitch_mean: ${model.pitch_mean}
+      pitch_std: ${model.pitch_std}
+
+    dataloader_params:
+      drop_last: false
+      shuffle: true
+      batch_size: 32
+      num_workers: 12
+      pin_memory: true
+
+  validation_ds:
+    dataset:
+      _target_: nemo.collections.tts.data.dataset.TTSDataset
+      manifest_filepath: ${validation_datasets}
+      sample_rate: ${model.sample_rate}
+      sup_data_path: ${sup_data_path}
+      sup_data_types: ${sup_data_types}
+      n_fft: ${model.n_fft}
+      win_length: ${model.n_window_size}
+      hop_length: ${model.n_window_stride}
+      window: ${model.window}
+      n_mels: ${model.n_mel_channels}
+      lowfreq: ${model.lowfreq}
+      highfreq: ${model.highfreq}
+      max_duration: null # change to null to include longer audios.
+      min_duration: 0.1
+      ignore_file: null
+      trim: true
+      trim_top_db: 50
+      trim_frame_length: ${model.n_window_size}
+      trim_hop_length: ${model.n_window_stride}
+      pitch_fmin: ${model.pitch_fmin}
+      pitch_fmax: ${model.pitch_fmax}
+      pitch_norm: true
+      pitch_mean: ${model.pitch_mean}
+      pitch_std: ${model.pitch_std}
+
+    dataloader_params:
+      drop_last: false
+      shuffle: false
+      batch_size: 32
+      num_workers: 2
+      pin_memory: true
+
+  preprocessor:
+    _target_: nemo.collections.asr.modules.AudioToMelSpectrogramPreprocessor
+    features: ${model.n_mel_channels}
+    lowfreq: ${model.lowfreq}
+    highfreq: ${model.highfreq}
+    n_fft: ${model.n_fft}
+    n_window_size: ${model.n_window_size}
+    window_size: false
+    n_window_stride: ${model.n_window_stride}
+    window_stride: false
+    pad_to: 1
+    pad_value: 0
+    sample_rate: ${model.sample_rate}
+    window: ${model.window}
+    normalize: null
+    preemph: null
+    dither: 0.0
+    frame_splicing: 1
+    log: true
+    log_zero_guard_type: add
+    log_zero_guard_value: 1e-05
+    mag_power: 1.0
+
+  input_fft: #n_embed and padding_idx are added by the model
+    _target_: nemo.collections.tts.modules.transformer.FFTransformerEncoder
+    n_layer: 6
+    n_head: 1
+    d_model: ${model.symbols_embedding_dim}
+    d_head: 64
+    d_inner: 1536
+    kernel_size: 3
+    dropout: 0.1
+    dropatt: 0.1
+    dropemb: 0.0
+    d_embed: ${model.symbols_embedding_dim}
+
+  output_fft:
+    _target_: nemo.collections.tts.modules.transformer.FFTransformerDecoder
+    n_layer: 6
+    n_head: 1
+    d_model: ${model.symbols_embedding_dim}
+    d_head: 64
+    d_inner: 1536
+    kernel_size: 3
+    dropout: 0.1
+    dropatt: 0.1
+    dropemb: 0.0
+
+  alignment_module:
+    _target_: nemo.collections.tts.modules.aligner.AlignmentEncoder
+    n_text_channels: ${model.symbols_embedding_dim}
+
+  duration_predictor:
+    _target_: nemo.collections.tts.modules.fastpitch.TemporalPredictor
+    input_size: ${model.symbols_embedding_dim}
+    kernel_size: 3
+    filter_size: 256
+    dropout: 0.1
+    n_layers: 2
+
+  pitch_predictor:
+    _target_: nemo.collections.tts.modules.fastpitch.TemporalPredictor
+    input_size: ${model.symbols_embedding_dim}
+    kernel_size: 3
+    filter_size: 256
+    dropout: 0.1
+    n_layers: 2
+
+  optim:
+    name: adamw
+    lr: 1e-3
+    betas: [0.9, 0.999]
+    weight_decay: 1e-6
+
+    sched:
+      name: NoamAnnealing
+      warmup_steps: 1000
+      last_epoch: -1
+      d_model: 1 # Disable scaling based on model dim
+
+trainer:
+  num_nodes: 1
+  devices: -1 # number of gpus
+  accelerator: gpu
+  strategy: ddp
+  precision: 16
+  max_epochs: 5000
+  accumulate_grad_batches: 1
+  gradient_clip_val: 1000.0
+  enable_checkpointing: false # Provided by exp_manager
+  logger: false # Provided by exp_manager
+  log_every_n_steps: 100
+  check_val_every_n_epoch: 5
+  benchmark: false
+
+exp_manager:
+  exp_dir: null
+  name: ${name}
+  create_tensorboard_logger: true
+  create_checkpoint_callback: true
+  checkpoint_callback_params:
+    monitor: val_loss
+  resume_if_exists: false
+  resume_ignore_no_checkpoint: false