def accuracy(y, t):
y, t = as_variable(y), as_variable(t)
pred = y.data.argmax(axis=1).reshape(t.shape)
result = (pred == t.data)
acc = result.mean()
return Variable(as_array(acc))
def softmax_cross_entropy_simple(x, t):
x, t = as_variable(x), as_variable(t)
N = x.shape[0]
p = softmax(x)
p = clip(p, 1e-15, 1.0)
log_p = log(p)
tlog_p = log_p[np.arange(N), t.data]
y = -1 * sum(tlog_p) / N
return y
def reshape(x, shape):
"""
Def reshape
Explanation
-----------
Get parameter(shape) is ndarray.shape and reshape parameter(x)'s shape from parameter(shape).
"""
if x.shape == shape:
return as_variable(x)
return Reshape(shape)(x)
def mean_squared_error_simple(x0, x1):
x0, x1 = as_variable(x0), as_variable(x1)
diff = x0 - x1
y = sum(diff**2) / len(diff)
return y
def softmax_simple(x, axis=1):
x = as_variable(x)
y = exp(x)
sum_y = sum(y, axis=axis, keepdims=True)
return y / sum_y
def sigmoid_simple(x):
x = as_variable(x)
y = 1 / (1 + exp(-x))
return y
def sum_to(x, shape):
if x.shape == shape:
return as_variable(x)
return SumTo(shape)(x)
def broadcast_to(x, shape):
if x.shape == shape:
return as_variable(x)
return BroadcastTo(shape)(x)