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Zchen
2025-10-19 23:55:56 +08:00
parent fed5fd8251
commit 4db3625dc5
2 changed files with 78 additions and 37 deletions
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42
model_training_nnn_tpu/dataset_tf.py
View File

@@ -851,23 +851,25 @@ def analyze_dataset_shapes(dataset_tf: BrainToTextDatasetTF, sample_size: int =
# Utility functions for TPU-optimized data pipeline
def create_input_fn(dataset_tf: BrainToTextDatasetTF,
transform_args: Dict[str, Any],
max_shapes: Dict[str, int],
training: bool = True,
cache_path: Optional[str] = None) -> tf.data.Dataset:
"""
Create input function for TPU training with DYNAMIC padding and data augmentation
Create input function for TPU training with PRE-ANALYZED FIXED shapes
This function uses dynamic shapes to avoid the "pad to a smaller size" error.
All variable-length dimensions use tf.TensorShape([None, ...]) to allow
TensorFlow to automatically determine the appropriate padding size for each batch.
This function uses pre-computed maximum shapes to create fixed-size batches,
ensuring XLA compilation success on TPU hardware.
Args:
dataset_tf: BrainToTextDatasetTF instance
transform_args: Data transformation configuration
max_shapes: Pre-computed maximum shapes dictionary with keys:
'max_time_steps', 'max_phone_seq_len', 'max_transcription_len', 'n_features'
training: Whether this is for training (applies augmentations)
cache_path: Optional path for disk caching to improve I/O performance
Returns:
tf.data.Dataset ready for TPU training with dynamic shapes
tf.data.Dataset ready for TPU training with fixed shapes
"""
# Create individual example dataset with file-grouping I/O optimization
@@ -916,22 +918,29 @@ def create_input_fn(dataset_tf: BrainToTextDatasetTF,
num_parallel_calls=tf.data.AUTOTUNE
)
# ========================= DYNAMIC SHAPES SOLUTION =========================
# 使用动态形状避免 "pad to a smaller size" 错误
# 这是最简单、最健壮的解决方案
print("🔧 Using DYNAMIC shapes for maximum compatibility and robustness.")
# ========================= FIXED SHAPES SOLUTION =========================
# 使用预分析的固定形状确保 XLA 编译成功
print(f"🔧 Using PRE-ANALYZED FIXED shapes for maximum TPU performance:")
# Calculate number of features based on subset
n_features = len(dataset_tf.feature_subset) if dataset_tf.feature_subset else 512
# 从传入的参数中获取形状信息
max_time_steps = max_shapes['max_time_steps']
max_phone_seq_len = max_shapes['max_phone_seq_len']
max_transcription_len = max_shapes['max_transcription_len']
n_features = max_shapes['n_features']
# Define dynamic padded shapes - all variable dimensions use None
print(f" Fixed time steps: {max_time_steps}")
print(f" Fixed phone sequence length: {max_phone_seq_len}")
print(f" Fixed transcription length: {max_transcription_len}")
print(f" Number of features: {n_features}")
# Define fixed padded shapes - NO None values for XLA compatibility
padded_shapes = {
'input_features': tf.TensorShape([None, n_features]), # 时间维度动态
'seq_class_ids': tf.TensorShape([None]), # 序列长度动态
'input_features': tf.TensorShape([max_time_steps, n_features]),
'seq_class_ids': tf.TensorShape([max_phone_seq_len]),
'n_time_steps': tf.TensorShape([]), # 标量
'phone_seq_lens': tf.TensorShape([]), # 标量
'day_indices': tf.TensorShape([]), # 标量
'transcriptions': tf.TensorShape([None]), # 转录长度动态
'transcriptions': tf.TensorShape([max_transcription_len]),
'block_nums': tf.TensorShape([]), # 标量
'trial_nums': tf.TensorShape([]) # 标量
}
@@ -948,8 +957,7 @@ def create_input_fn(dataset_tf: BrainToTextDatasetTF,
'trial_nums': 0
}
# Create batches with dynamic padding - TensorFlow will automatically
# determine the appropriate padding size for each batch
# Create batches with FIXED padding - XLA compiler will be happy!
dataset = dataset.padded_batch(
batch_size=dataset_tf.batch_size,
padded_shapes=padded_shapes,

73
model_training_nnn_tpu/trainer_tf.py
View File

@@ -27,7 +27,8 @@ from dataset_tf import (
BrainToTextDatasetTF,
DataAugmentationTF,
train_test_split_indices,
create_input_fn
create_input_fn,
analyze_dataset_shapes
)
@@ -550,25 +551,25 @@ class BrainToTextDecoderTrainerTF:
# Calculate losses
if use_full:
# Clean CTC loss - use tf.nn.ctc_loss (TPU-compatible)
# Clean CTC loss - use tf.nn.ctc_loss with dense labels (fixed shapes)
# tf.nn.ctc_loss expects logits in time-major format [max_time, batch_size, num_classes]
clean_logits_time_major = tf.transpose(clean_logits, [1, 0, 2])
clean_loss = tf.nn.ctc_loss(
labels=tf.cast(labels, tf.int32),
labels=tf.cast(labels, tf.int32), # Use dense labels with fixed shapes
logits=clean_logits_time_major,
label_length=tf.cast(phone_seq_lens, tf.int32),
label_length=tf.cast(phone_seq_lens, tf.int32), # Re-enable label_length
logit_length=tf.cast(adjusted_lens, tf.int32),
blank_index=0,
logits_time_major=True
)
clean_loss = tf.reduce_mean(clean_loss)
# Noisy CTC loss - use tf.nn.ctc_loss (TPU-compatible)
# Noisy CTC loss - use tf.nn.ctc_loss with dense labels (fixed shapes)
noisy_logits_time_major = tf.transpose(noisy_logits, [1, 0, 2])
noisy_loss = tf.nn.ctc_loss(
labels=tf.cast(labels, tf.int32),
labels=tf.cast(labels, tf.int32), # Use dense labels with fixed shapes
logits=noisy_logits_time_major,
label_length=tf.cast(phone_seq_lens, tf.int32),
label_length=tf.cast(phone_seq_lens, tf.int32), # Re-enable label_length
logit_length=tf.cast(adjusted_lens, tf.int32),
blank_index=0,
logits_time_major=True
@@ -582,12 +583,12 @@ class BrainToTextDecoderTrainerTF:
loss = clean_loss + self.adv_noisy_loss_weight * noisy_loss + self.adv_noise_l2_weight * noise_l2
else:
# Standard CTC loss - use tf.nn.ctc_loss (TPU-compatible)
# Standard CTC loss - use tf.nn.ctc_loss with dense labels (fixed shapes)
logits_time_major = tf.transpose(clean_logits, [1, 0, 2])
loss = tf.nn.ctc_loss(
labels=tf.cast(labels, tf.int32),
labels=tf.cast(labels, tf.int32), # Use dense labels with fixed shapes
logits=logits_time_major,
label_length=tf.cast(phone_seq_lens, tf.int32),
label_length=tf.cast(phone_seq_lens, tf.int32), # Re-enable label_length
logit_length=tf.cast(adjusted_lens, tf.int32),
blank_index=0,
logits_time_major=True
@@ -652,13 +653,13 @@ class BrainToTextDecoderTrainerTF:
# Forward pass (inference mode only)
logits = self.model(features, day_indices, None, False, 'inference', training=False)
# Calculate loss - use tf.nn.ctc_loss (TPU-compatible)
# Calculate loss - use tf.nn.ctc_loss with dense labels (fixed shapes)
# tf.nn.ctc_loss expects logits in time-major format [max_time, batch_size, num_classes]
logits_time_major = tf.transpose(logits, [1, 0, 2])
loss = tf.nn.ctc_loss(
labels=tf.cast(labels, tf.int32),
labels=tf.cast(labels, tf.int32), # Use dense labels with fixed shapes
logits=logits_time_major,
label_length=tf.cast(phone_seq_lens, tf.int32),
label_length=tf.cast(phone_seq_lens, tf.int32), # Re-enable label_length
logit_length=tf.cast(adjusted_lens, tf.int32),
blank_index=0,
logits_time_major=True
@@ -679,28 +680,60 @@ class BrainToTextDecoderTrainerTF:
initial_tpu_status = self._get_detailed_tpu_status()
self.logger.info(f"Initial TPU Status: {initial_tpu_status}")
# Create datasets using modern distribution API
def create_dist_dataset_fn(input_dataset_tf, training):
"""Create distributed dataset function for modern TPU strategy"""
# ========================= DATASET SHAPE ANALYSIS =========================
# Perform one-time full dataset analysis for fixed shapes (TPU requirement)
self.logger.info("🚀 Performing one-time full dataset analysis for fixed shapes...")
# Analyze training dataset (all data for accurate max shapes)
train_analysis_start = time.time()
train_max_shapes = analyze_dataset_shapes(self.train_dataset_tf, sample_size=-1)
train_analysis_time = time.time() - train_analysis_start
self.logger.info(f"✅ Training dataset analysis completed in {train_analysis_time:.2f}s")
# Analyze validation dataset (all data for accurate max shapes)
val_analysis_start = time.time()
val_max_shapes = analyze_dataset_shapes(self.val_dataset_tf, sample_size=-1)
val_analysis_time = time.time() - val_analysis_start
self.logger.info(f"✅ Validation dataset analysis completed in {val_analysis_time:.2f}s")
# Use maximum shapes across both datasets for consistent padding
final_max_shapes = {
'max_time_steps': max(train_max_shapes['max_time_steps'], val_max_shapes['max_time_steps']),
'max_phone_seq_len': max(train_max_shapes['max_phone_seq_len'], val_max_shapes['max_phone_seq_len']),
'max_transcription_len': max(train_max_shapes['max_transcription_len'], val_max_shapes['max_transcription_len']),
'n_features': train_max_shapes['n_features']
}
self.logger.info(f"📊 Final fixed shapes for TPU training:")
self.logger.info(f" Time steps: {final_max_shapes['max_time_steps']}")
self.logger.info(f" Phone sequence length: {final_max_shapes['max_phone_seq_len']}")
self.logger.info(f" Transcription length: {final_max_shapes['max_transcription_len']}")
self.logger.info(f" Features: {final_max_shapes['n_features']}")
# =====================================================================
# Create datasets using modern distribution API with fixed shapes
def create_dist_dataset_fn(input_dataset_tf, training, max_shapes):
"""Create distributed dataset function for modern TPU strategy with fixed shapes"""
def dataset_fn(input_context):
# create_input_fn returns a complete, batched tf.data.Dataset
# create_input_fn now requires max_shapes parameter for fixed shapes
return create_input_fn(
input_dataset_tf,
self.args['dataset']['data_transforms'],
max_shapes=max_shapes, # Pass pre-analyzed shapes
training=training
)
return self.strategy.distribute_datasets_from_function(dataset_fn)
# Distribute datasets using modern API
# Distribute datasets using modern API with fixed shapes
self.logger.info("🔄 Distributing training dataset across TPU cores...")
dist_start_time = time.time()
train_dist_dataset = create_dist_dataset_fn(self.train_dataset_tf, training=True)
train_dist_dataset = create_dist_dataset_fn(self.train_dataset_tf, training=True, max_shapes=final_max_shapes)
train_dist_time = time.time() - dist_start_time
self.logger.info(f"✅ Training dataset distributed in {train_dist_time:.2f}s")
self.logger.info("🔄 Distributing validation dataset across TPU cores...")
val_start_time = time.time()
val_dist_dataset = create_dist_dataset_fn(self.val_dataset_tf, training=False)
val_dist_dataset = create_dist_dataset_fn(self.val_dataset_tf, training=False, max_shapes=final_max_shapes)
val_dist_time = time.time() - val_start_time
self.logger.info(f"✅ Validation dataset distributed in {val_dist_time:.2f}s")