mindspore.ops.ReverseSequence
- class mindspore.ops.ReverseSequence(seq_dim, batch_dim=0)[源代码]
对输入序列进行部分反转。
参数:
seq_dim (int) - 指定反转的维度,此值为必填参数。
batch_dim (int) - 指定切片维度。默认值:0。
输入:
x (Tensor) - 输入需反转的数据,其数据类型支持包括bool在内的所有数值型。
seq_lengths (Tensor) - 指定反转长度,为一维向量,其数据类型为int32或int64。
输出:
shape和数据类型与输入相同。
异常:
TypeError - seq_dim 或 batch_dim 不是int。
ValueError - batch_dim 大于或等于 x 的shape长度。
- 支持平台:
Ascend
GPU
CPU
样例:
>>> x = Tensor(np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]]), mindspore.float32) >>> seq_lengths = Tensor(np.array([1, 2, 3])) >>> reverse_sequence = ops.ReverseSequence(seq_dim=1) >>> output = reverse_sequence(x, seq_lengths) >>> print(output) [[1. 2. 3.] [5. 4. 6.] [9. 8. 7.]] >>> x = Tensor(np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]]), mindspore.float32) >>> seq_lengths = Tensor(np.array([1, 2, 3])) >>> reverse_sequence = ops.ReverseSequence(seq_dim=0, batch_dim=1) >>> output = reverse_sequence(x, seq_lengths) >>> print(output) [[1. 5. 9.] [4. 2. 6.] [7. 8. 3.]] >>> x = Tensor(np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]]), mindspore.float32) >>> seq_lengths = Tensor(np.array([2, 2, 3])) >>> reverse_sequence = ops.ReverseSequence(seq_dim=1) >>> output = reverse_sequence(x, seq_lengths) >>> print(output) [[2. 1. 3.] [5. 4. 6.] [9. 8. 7.]] >>> x = Tensor(np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]]), mindspore.float32) >>> seq_lengths = Tensor(np.array([3, 2, 3])) >>> reverse_sequence = ops.ReverseSequence(seq_dim=1) >>> output = reverse_sequence(x, seq_lengths) >>> print(output) [[3. 2. 1.] [5. 4. 6.] [9. 8. 7.]] >>> x = Tensor(np.array([[1, 2, 3, 4], [5, 6, 7, 8]]), mindspore.float32) >>> seq_lengths = Tensor(np.array([4, 4])) >>> reverse_sequence = ops.ReverseSequence(seq_dim=1) >>> output = reverse_sequence(x, seq_lengths) >>> print(output) [[4. 3. 2. 1.] [8. 7. 6. 5.]]