forked from mindspore-Ecosystem/mindspore
40 lines
1.0 KiB
ReStructuredText
40 lines
1.0 KiB
ReStructuredText
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mindspore.nn.Tanh
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=============================
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.. py:class:: mindspore.nn.Tanh
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Tanh激活函数。
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按元素计算Tanh函数,返回一个新的Tensor,该Tensor是输入元素的双曲正切值。
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Tanh函数定义为:
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.. math::
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tanh(x_i) = \frac{\exp(x_i) - \exp(-x_i)}{\exp(x_i) + \exp(-x_i)} = \frac{\exp(2x_i) - 1}{\exp(2x_i) + 1},
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其中 :math:`x_i` 是输入Tensor的元素。
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**输入:**
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- **x** (Tensor) - 数据类型为float16或float32的Tanh输入。shape为 :math:`(N,*)` ,其中 :math:`*` 表示任意的附加维度。
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**输出:**
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Tensor,数据类型和shape与 `x` 的相同。
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**异常:**
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**TypeError** - `x` 的数据类型既不是float16也不是float32。
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**支持平台:**
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``Ascend`` ``GPU`` ``CPU``
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**样例:**
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>>> x = Tensor(np.array([1, 2, 3, 2, 1]), mindspore.float16)
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>>> tanh = nn.Tanh()
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>>> output = tanh(x)
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>>> print(output)
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[0.7617 0.964 0.995 0.964 0.7617]
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