def fprop(self):
pred = self.x.out
target = self.target.out
if self.clip:
ca.clip(pred, _FLT_MIN, .9999999, pred)
self.out = -ca.sum(target * ca.log(pred) +
(1 - target) * ca.log(1 - pred))
def fprop(self):
# -target * log(pred)
tmp1 = self.pred.array + self.eps
ca.log(tmp1, tmp1)
tmp1 *= self.target.array
ca.sum(tmp1, axis=1, out=self.array)
ca.negative(self.array, self.array)
def fprop(self):
# -target * log(pred)
tmp1 = self.pred.array + self.eps
ca.log(tmp1, tmp1)
tmp1 *= self.target.array
ca.sum(tmp1, axis=1, out=self.array)
ca.negative(self.array, self.array)
def bprop(self):
if self.lhs.bpropable:
tmp = self.rhs.array - 1
ca.power(self.lhs.array, tmp, out=self.lhs.grad_array)
self.lhs.grad_array *= self.rhs.array
self.lhs.grad_array *= self.grad_array
if self.rhs.bpropable:
ca.log(self.lhs.array, out=self.rhs.grad_array)
self.rhs.grad_array *= self.array
self.rhs.grad_array *= self.grad_array
def bprop(self):
if self.lhs.bpropable:
tmp = self.rhs.array - 1
ca.power(self.lhs.array, tmp, out=self.lhs.grad_array)
self.lhs.grad_array *= self.rhs.array
self.lhs.grad_array *= self.grad_array
if self.rhs.bpropable:
ca.log(self.lhs.array, out=self.rhs.grad_array)
self.rhs.grad_array *= self.array
self.rhs.grad_array *= self.grad_array
def bprop(self):
if self.lhs_bprop:
tmp = self.rhs.out - 1
ca.power(self.lhs.out, tmp, out=self.lhs.out_grad)
self.lhs.out_grad *= self.rhs.out
self.lhs.out_grad *= self.out_grad
if self.rhs_bprop:
ca.log(self.lhs.out, out=self.rhs.out_grad)
self.rhs.out_grad *= self.out
self.rhs.out_grad *= self.out_grad
def bprop(self):
if self.lhs_bprop:
tmp = self.rhs.out - 1
ca.power(self.lhs.out, tmp, out=self.lhs.out_grad)
self.lhs.out_grad *= self.rhs.out
self.lhs.out_grad *= self.out_grad
if self.rhs_bprop:
ca.log(self.lhs.out, out=self.rhs.out_grad)
self.rhs.out_grad *= self.out
self.rhs.out_grad *= self.out_grad
def fprop(self):
# -log(1 - pred)*(1 - target) - log(pred)*target
tmp1 = 1 - self.pred.array
tmp1 += self.eps
ca.log(tmp1, tmp1)
tmp2 = 1 - self.target.array
ca.multiply(tmp1, tmp2, tmp1)
ca.add(self.pred.array, self.eps, tmp2)
ca.log(tmp2, tmp2)
tmp2 *= self.target.array
ca.add(tmp1, tmp2, tmp1)
tmp1 *= -1
ca.sum(tmp1, axis=1, out=self.array)
def fprop(self):
# -log(1 - pred)*(1 - target) - log(pred)*target
tmp1 = 1 - self.pred.out
tmp1 += self.eps
ca.log(tmp1, tmp1)
tmp2 = 1 - self.target.out
ca.multiply(tmp1, tmp2, tmp1)
ca.add(self.pred.out, self.eps, tmp2)
ca.log(tmp2, tmp2)
tmp2 *= self.target.out
ca.add(tmp1, tmp2, tmp1)
tmp1 *= -1
ca.sum(tmp1, axis=1, keepdims=True, out=self.out)
def fprop(self):
# -log(1 - pred)*(1 - target) - log(pred)*target
tmp1 = 1 - self.pred.array
tmp1 += self.eps
ca.log(tmp1, tmp1)
tmp2 = 1 - self.target.array
ca.multiply(tmp1, tmp2, tmp1)
ca.add(self.pred.array, self.eps, tmp2)
ca.log(tmp2, tmp2)
tmp2 *= self.target.array
ca.add(tmp1, tmp2, tmp1)
tmp1 *= -1
ca.sum(tmp1, axis=1, out=self.array)
def categorical_cross_entropy(y_pred, y_true, eps=1e-15):
# Assumes one-hot encoding.
y_pred = ca.clip(y_pred, eps, 1 - eps)
# XXX: do we need to normalize?
y_pred /= ca.sum(y_pred, axis=1, keepdims=True)
loss = -ca.sum(y_true * ca.log(y_pred), axis=1)
return loss
def categorical_cross_entropy(y_pred, y_true, eps=1e-15):
# Assumes one-hot encoding.
y_pred = ca.clip(y_pred, eps, 1 - eps)
# XXX: do we need to normalize?
y_pred /= ca.sum(y_pred, axis=1, keepdims=True)
loss = -ca.sum(y_true * ca.log(y_pred), axis=1)
return loss
def fprop(self):
ca.log(self.x.out, out=self.out)
def fprop(self):
pred = self.x.out
target = self.target.out
if self.clip:
ca.clip(pred, _FLT_MIN, .9999999, pred)
self.out = -ca.sum(target*ca.log(pred) + (1 - target)*ca.log(1 - pred))
def fprop(self):
ca.exp(self.x.out, self.out)
# TODO: use log1p()
self.out += 1
ca.log(self.out, self.out)
def loss(self, y, y_pred):
return ca.mean(-ca.sum(y*ca.log(y_pred+self.eps) +
(1-y) * ca.log(1-y_pred+self.eps), axis=1))
def loss(self, pred, target):
pred = ca.maximum(pred, _FLT_MIN)
return -ca.sum(target*ca.log(pred) + (1 - target)*ca.log(1 - pred),
axis=1)
def fprop(self):
ca.log(self.x.array, out=self.array)
def fprop(self):
ca.log(self.x.out, out=self.out)
def fprop(self):
ca.log(self.x.array, out=self.array)
def loss(self, y, y_pred):
y_pred = ca.maximum(y_pred, _FLT_MIN)
return -ca.mean(y*ca.log(y_pred) + (1 - y)*ca.log(1 - y_pred), axis=1)
def fprop(self, x):
self._tmp_x = x
return ca.log(1.0 + ca.exp(x))
def fprop(self, x):
self._tmp_x = x
return ca.log(1.0 + ca.exp(x))
def loss(self, pred, target):
pred = ca.maximum(pred, _FLT_MIN)
return -ca.sum(target * ca.log(pred) + (1 - target) * ca.log(1 - pred), axis=1)
