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Edit __pow()__ to calculate the derivation of both Exponent and base. #70

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Edit __pow()__ to calculate the derivation of both Exponent and base. #70

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15e3ece
Update engine.py
Yara97Mansour May 9, 2024
8635ccb
Update engine.py
Yara97Mansour May 9, 2024
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9 changes: 6 additions & 3 deletions micrograd/engine.py
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Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@
import math

class Value:
""" stores a single scalar value and its gradient """
Expand Down Expand Up @@ -32,12 +33,14 @@ def _backward():

return out

# __pow()__ changed to calculate the derivation of both Exponent and base
def __pow__(self, other):
assert isinstance(other, (int, float)), "only supporting int/float powers for now"
out = Value(self.data**other, (self,), f'**{other}')
other = other if isinstance(other, Value) else Value(other)
out = Value(self.data**other.data, (self,other), '**')

def _backward():
self.grad += (other * self.data**(other-1)) * out.grad
self.grad += (other.data * self.data**((other.data)-1)) * out.grad
other.grad += (math.log(self.data)) * (self.data**other.data) * out.grad
out._backward = _backward

return out
Expand Down