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\r\n[?2004l\r]633;E;cp utils/dataloader.py utils/dataloader_new.py;7e8119c7-7b99-4b0c-870d-b0c10112015b]633;C
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import functools\nimport jax\n\nimport tensorflow as tf\n\n# reserve GPU memory for JAX only if tensorflow is built with GPU support\ntry:\n tf.config.experimental.set_visible_devices([], "GPU")\nexcept tf.errors.NotFoundError:\n pass\n\n\n# --- TensorFlow function for processing: slicing, normalization ---\ndef _tf_process_episode(episode_tensor, seq_len, image_h, image_w, image_c):\n """\n Processes a raw episode tensor in TensorFlow.\n Takes a full episode, extracts a random sequence, and normalizes it.\n Args:\n episode_tensor: A TensorFlow tensor representing a full video episode.\n Expected shape: (dynamic_length, image_h, image_w, image_c)\n Expected dtype: e.g., tf.uint8 (raw pixel values)\n seq_len: The desired length of the sub-sequence to extract.\n image_h: The height of each frame.\n image_w: The width of each frame.\n image_c: The number of channels in each frame.\n Returns:\n A TensorFlow tensor representing the processed video sequence.\n Shape: (seq_len, image_h, image_w, image_c)\n Dtype: tf.float32 (normalized pixel values)\n """\n current_episode_len = tf.shape(episode_tensor)[0]\n\n max_start_idx = current_episode_len - seq_len\n\n start_idx = tf.random.uniform(\n shape=(), minval=0, maxval=max_start_idx + 1, dtype=tf.int32\n )\n\n seq = episode_tensor[start_idx : start_idx + seq_len]\n\n seq = tf.cast(seq, tf.float32) / 255.0\n\n # Ensure the final shape is statically known for batching.\n # tf.reshape is robust, but tf.ensure_shape or set_shape can also be used if confident.\n processed_sequence = tf.reshape(seq, [seq_len, image_h, image_w, image_c])\n\n return processed_sequence\n\n\ndef _parse_tfrecord_fn(example_proto, image_h, image_w, image_c):\n feature_description = {\n "height": tf.io.FixedLenFeature([], tf.int64),\n "width": tf.io.FixedLenFeature([], tf.int64),\n "channels": tf.io.FixedLenFeature([], tf.int64),\n "sequence_length": tf.io.FixedLenFeature([], tf.int64),\n "raw_video": tf.io.FixedLenFeature([], tf.string),\n }\n example = tf.io.parse_single_example(example_proto, feature_description)\n\n video_shape = (example["sequence_length"], image_h, image_w, image_c)\n\n episode_tensor = tf.io.decode_raw(example["raw_video"], out_type=tf.uint8)\n episode_tensor = tf.reshape(episode_tensor, video_shape)\n\n episode_tensor = tf.ensure_shape(episode_tensor, [None, image_h, image_w, image_c])\n return episode_tensor\n\n\ndef get_dataloader(\n tfrecord_paths: list[str], # List of TFRecord file paths\n seq_len: int,\n global_batch_size: int,\n image_h: int,\n image_w: int,\n image_c: int,\n shuffle_buffer_size: int = 10,\n num_parallel_calls: int = tf.data.AUTOTUNE,\n seed: int = 42,\n):\n """\n Creates a tf.data.Dataset pipeline from TFRecord files.\n """\n if not tfrecord_paths:\n raise ValueError("tfrecord_paths list cannot be empty.")\n\n process_id = jax.process_index()\n num_processes = jax.process_count()\n\n assert (\n global_batch_size % num_processes == 0\n ), "Global batch size {global_batch_size} \\n must be divisible by the number of JAX processes {num_processes} for proper sharding."\n per_process_batch_size = global_batch_size // num_processes\n\n # Create a dataset of just the paths (filenames)\n path_dataset = tf.data.Dataset.from_tensor_slices(tfrecord_paths)\n breakpoint()\n\n dataset = tf.data.TFRecordDataset(\n tfrecord_paths, num_parallel_reads=tf.data.AUTOTUNE\n )\n\n dataset = dataset.shard(num_shards=num_processes, index=process_id)\n\n # (f.srambical) NOTE: For TFRecords, it's often good to have a large shuffle buffer.\n if shuffle_buffer_size > 0:\n dataset = dataset.shuffle(\n buffer_size=shuffle_buffer_size, seed=seed, reshuffle_each_iteration=True\n )\n parse_fn = functools.partial(\n _parse_tfrecord_fn, image_h=image_h, image_w=image_w, image_c=image_c\n )\n dataset = dataset.map(parse_fn, num_parallel_calls=num_parallel_calls)\n\n tf_process_fn = functools.partial(\n _tf_process_episode,\n seq_len=seq_len,\n image_h=image_h,\n image_w=image_w,\n image_c=image_c,\n )\n dataset = dataset.map(tf_process_fn, num_parallel_calls=num_parallel_calls)\n\n dataset = dataset.repeat(None)\n dataset = dataset.batch(per_process_batch_size, drop_remainder=True)\n dataset = dataset.prefetch(tf.data.AUTOTUNE)\n\n return dataset.as_numpy_iterator()\n
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