wehub-resource-sync
25 lines
606 B
Python
Executable File
25 lines
606 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 Trace(Function):
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def forward(self, x):
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x = self._convert2tensor(x)
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self._equal_ndim(x, 2)
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self.x = x
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output = np.trace(x.value)
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if isinstance(self.x, Constant):
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return Constant(output)
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return Tensor(output, function=self)
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def backward(self, delta):
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dx = np.eye(self.x.shape[0], self.x.shape[1]) * delta
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self.x.backward(dx)
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def trace(x):
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return Trace().forward(x)
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