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step18: fix AttributeError: NoneType object has no attribute generation #41

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step18: fix AttributeError: NoneType object has no attribute generation #41

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12 changes: 10 additions & 2 deletions steps/step18.py
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Original file line number Diff line number Diff line change
Expand Up @@ -52,7 +52,9 @@ def add_func(f):
seen_set.add(f)
funcs.sort(key=lambda x: x.generation)

add_func(self.creator)

if self.creator is not None: # skip the first variable, whose creator is none
add_func(self.creator)

while funcs:
f = funcs.pop()
Expand Down Expand Up @@ -148,4 +150,10 @@ def add(x0, x1):

with no_grad():
x = Variable(np.array(2.0))
y = square(x)
y = square(x)

with using_config('enable_backprop', False):
x = Variable(np.ones((100, 100, 100)))
y = square(square(square(x)))
y.backward()
print(x.grad)