30 lines
1015 B
Python
30 lines
1015 B
Python
import numpy as np
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import paddle
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def shuffle_dim(x, axis, perm=None):
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"""Permute input tensor along aixs given the permutation or randomly.
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Args:
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x (Tensor): shape(*, d_{axis}, *), the input tensor.
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axis (int): the axis to shuffle.
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perm (list[int], ndarray, optional): a permutation of [0, d_{axis}),
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the order to reorder the tensor along the `axis`-th dimension, if
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not provided, randomly shuffle the `axis`-th dimension. Defaults to
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None.
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Returns:
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Tensor: the shuffled tensor, it has the same shape as x does.
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"""
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size = x.shape[axis]
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if perm is not None and len(perm) != size:
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raise ValueError("length of permutation should equals the input "
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"tensor's axis-th dimension's size")
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if perm is not None:
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perm = np.array(perm)
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else:
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perm = np.random.permutation(size)
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perm = paddle.to_tensor(perm)
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out = paddle.gather(x, perm, axis)
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return out
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