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"""
collate.py
"""
import torch
class CocoCollator:
def __init__(self, pad_token_id):
self.pad_token_id = pad_token_id
def __call__(self, batch):
# Stack pixel values
pixel_values = torch.stack([item["pixel_values"] for item in batch], dim=0)
# Collect caption fields
input_ids = [item["input_ids"] for item in batch]
attention_masks = [item["attention_mask"] for item in batch]
# Pad input_ids
input_ids_padded = torch.nn.utils.rnn.pad_sequence(
input_ids, batch_first=True, padding_value=self.pad_token_id
)
attention_masks_padded = torch.nn.utils.rnn.pad_sequence(
attention_masks, batch_first=True, padding_value=0 # attention padding = 0
)
image_ids = [item["image_id"] for item in batch]
return {
"pixel_values": pixel_values,
"input_ids": input_ids_padded,
"attention_mask": attention_masks_padded,
"image_ids": image_ids,
}
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