wehub-resource-sync
44 lines
1.1 KiB
Python
Executable File
44 lines
1.1 KiB
Python
Executable File
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 MatMul(Function):
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"""
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Matrix multiplication function
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"""
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def _check_input(self, x, y):
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x = self._convert2tensor(x)
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y = self._convert2tensor(y)
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self._equal_ndim(x, 2)
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self._equal_ndim(y, 2)
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if x.shape[1] != y.shape[0]:
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raise ValueError(
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"shapes {} and {} not aligned: {} (dim 1) != {} (dim 0)"
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.format(x.shape, y.shape, x.shape[1], y.shape[0])
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)
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return x, y
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def forward(self, x, y):
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x, y = self._check_input(x, y)
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self.x = x
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self.y = y
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if isinstance(self.x, Constant) and isinstance(self.y, Constant):
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return Constant(x.value @ y.value)
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return Tensor(x.value @ y.value, function=self)
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def backward(self, delta):
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dx = delta @ self.y.value.T
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dy = self.x.value.T @ delta
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self.x.backward(dx)
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self.y.backward(dy)
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def matmul(x, y):
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return MatMul().forward(x, y)
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def rmatmul(x, y):
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return MatMul().forward(y, x)
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