63 lines
2.2 KiB
Python
63 lines
2.2 KiB
Python
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import torch
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def pad(orig_items, key, padding_value=0, padding_side="left"):
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items = []
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if isinstance(orig_items[0][key], list):
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assert isinstance(orig_items[0][key][0], torch.Tensor)
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for it in orig_items:
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for tr in it[key]:
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items.append({key: tr})
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else:
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assert isinstance(orig_items[0][key], torch.Tensor)
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items = orig_items
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batch_size = len(items)
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shape = items[0][key].shape
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dim = len(shape)
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assert dim <= 3
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max_length = max(item[key].shape[-1] for item in items)
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min_length = min(item[key].shape[-1] for item in items)
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dtype = items[0][key].dtype
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if dim == 1:
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return torch.cat([item[key] for item in items], dim=0)
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elif dim == 2:
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if max_length == min_length:
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return torch.cat([item[key] for item in items], dim=0)
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tensor = torch.zeros((batch_size, max_length), dtype=dtype) + padding_value
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else:
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tensor = torch.zeros((batch_size, max_length, shape[-1]), dtype=dtype) + padding_value
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for i, item in enumerate(items):
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if dim == 2:
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if padding_side == "left":
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tensor[i, -len(item[key][0]) :] = item[key][0].clone()
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else:
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tensor[i, : len(item[key][0])] = item[key][0].clone()
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elif dim == 3:
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if padding_side == "left":
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tensor[i, -len(item[key][0]) :, :] = item[key][0].clone()
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else:
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tensor[i, : len(item[key][0]), :] = item[key][0].clone()
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return tensor
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def pad_raw(orig_items, max_length=1024, padding_value=0, padding_side="left"):
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max_cols = max(tensor.size(1) for tensor in orig_items)
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padded_arrays = []
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for tensor in orig_items:
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pad_cols = max_cols - tensor.size(1)
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if padding_side == "left":
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padded_tensor = torch.cat([torch.zeros(tensor.size(0), pad_cols), tensor], dim=1)
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elif padding_side == "right":
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padded_tensor = torch.cat([tensor, torch.zeros(tensor.size(0), pad_cols)], dim=1)
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else:
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raise ValueError("Invalid 'side' parameter. Must be 'left' or 'right'.")
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padded_arrays.append(padded_tensor)
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padded_tensor = torch.cat(padded_arrays, dim=0).to(dtype=torch.int32)
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return padded_tensor
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