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class Value:
def __init__(self, data, _children=(), _op='', label='') -> None:
self.label = label
self.data = float(data)
self.grad = 0.0
self._prev = set(_children)
self._op = _op
def __repr__(self) -> str:
return f'Value({self.data})'
def __add__(self, y):
result = self.data + y.data
return Value(result, (self, y), _op='+')
def __mul__(self, y):
result = self.data * y.data
return Value(result, (self, y), _op='*')
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