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logancyang/tensor_sigmoid.py

Last active June 26, 2020 22:53
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tensor_sigmoid.py
class Tensor:
def __init__(self, data, _parents, _op):
...
def sigmoid(self):
sigm = 1.0/(1 + np.exp(-self.data))
out = Tensor(sigm, _parents=(self,), _op="σ")
def _backward():
self.grad = sigm * (1 - sigm)
out._backward = _backward
return out
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