wehub-resource-sync
28 lines
634 B
Python
Executable File
28 lines
634 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 Abs(Function):
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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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self.output = np.abs(x.value)
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if isinstance(x, Constant):
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return Constant(self.output)
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self.sign = np.sign(x.value)
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return Tensor(self.output, function=self)
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def backward(self, delta):
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dx = self.sign * delta
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self.x.backward(dx)
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def abs(x):
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"""
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element-wise absolute function
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"""
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return Abs().forward(x)
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