mindspore.ops.reverse_sequence

mindspore.ops.reverse_sequence(x, seq_lengths, seq_dim, batch_dim=0)

对输入序列进行部分反转。

参数：

• x (Tensor) - 输入tensor。

• seq_lengths (Tensor) - 指定反转长度。

• seq_dim (int) - 指定反转的维度。

• batch_dim (int) - 指定切片维度，默认 0 。

返回：

Tensor

支持平台：

Ascend GPU CPU

样例：

>>> import mindspore
>>> x = mindspore.tensor([[1, 2, 3], [4, 5, 6], [7, 8, 9]], mindspore.float32)
>>> seq_lengths = mindspore.tensor([1, 2, 3])
>>> output = mindspore.ops.reverse_sequence(x, seq_lengths, seq_dim=1)
>>> print(output)
[[1. 2. 3.]
 [5. 4. 6.]
 [9. 8. 7.]]
>>> x = mindspore.tensor([[1, 2, 3], [4, 5, 6], [7, 8, 9]], mindspore.float32)
>>> seq_lengths = mindspore.tensor([1, 2, 3])
>>> output = mindspore.ops.reverse_sequence(x, seq_lengths, seq_dim=0, batch_dim=1)
>>> print(output)
[[1. 5. 9.]
 [4. 2. 6.]
 [7. 8. 3.]]
>>> x = mindspore.tensor([[1, 2, 3], [4, 5, 6], [7, 8, 9]], mindspore.float32)
>>> seq_lengths = mindspore.tensor([2, 2, 3])
>>> output = mindspore.ops.reverse_sequence(x, seq_lengths, seq_dim=1)
>>> print(output)
[[2. 1. 3.]
 [5. 4. 6.]
 [9. 8. 7.]]
>>> x = mindspore.tensor([[1, 2, 3], [4, 5, 6], [7, 8, 9]], mindspore.float32)
>>> seq_lengths = mindspore.tensor([3, 2, 3])
>>> output = mindspore.ops.reverse_sequence(x, seq_lengths, seq_dim=1)
>>> print(output)
[[3. 2. 1.]
 [5. 4. 6.]
 [9. 8. 7.]]
>>> x = mindspore.tensor([[1, 2, 3, 4], [5, 6, 7, 8]], mindspore.float32)
>>> seq_lengths = mindspore.tensor([4, 4])
>>> output = mindspore.ops.reverse_sequence(x, seq_lengths, seq_dim=1)
>>> print(output)
[[4. 3. 2. 1.]
 [8. 7. 6. 5.]]