fix typo in neuron call from back when i was debugging, use generator…

… there is no need to construct a list here

micrograd/nn.py

@@ -2,10 +2,14 @@
 from micrograd.engine import Value
 
 class Module:
+
  def zero_grad(self):
  for p in self.parameters():
  p.grad = 0
 
+ def parameters(self):
+ return []
+
 class Neuron(Module):
 
  def __init__(self, nin, nonlin=True):
@@ -14,7 +18,7 @@ def __init__(self, nin, nonlin=True):
  self.nonlin = nonlin
 
  def __call__(self, x):
- act = sum([wi*xi for wi,xi in zip(self.w, x)], self.b)
+ act = sum((wi*xi for wi,xi in zip(self.w, x)), self.b)
  return act.relu() if self.nonlin else act
 
  def parameters(self):