wehub-resource-sync
31 lines
677 B
Python
Executable File
31 lines
677 B
Python
Executable File
import numpy as np
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from prml.nn.tensor.constant import Constant
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from prml.nn.tensor.tensor import Tensor
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from prml.nn.function import Function
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class Square(Function):
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"""
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element-wise square of the input
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y = x * x
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"""
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def forward(self, x):
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x = self._convert2tensor(x)
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self.x = x
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if isinstance(self.x, Constant):
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return Constant(np.square(x.value))
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return Tensor(np.square(x.value), function=self)
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def backward(self, delta):
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dx = 2 * self.x.value * delta
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self.x.backward(dx)
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def square(x):
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"""
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element-wise square of the input
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y = x * x
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"""
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return Square().forward(x)
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