notwa/optim
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

use in-place (additive) form of filters

Browse Source
This commit is contained in:
Connor Olding 2017-07-21 21:02:47 +00:00
parent 7c4ef4ad05
commit be1795f6ed
1 changed files with 7 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
onn_core.py
View File

@ -323,9 +323,7 @@ class RMSprop(Optimizer):
self.g = np.zeros_like(dW)
# basically apply a first-order low-pass filter to delta squared
self.g[:] = self.mu * self.g + (1 - self.mu) * np.square(dW)
# equivalent (though numerically different?):
#self.g += (np.square(dW) - self.g) * (1 - self.mu)
self.g += (1 - self.mu) * (np.square(dW) - self.g)
# finally sqrt it to complete the running root-mean-square approximation
return -self.lr * dW / (np.sqrt(self.g) + self.eps)
@ -357,8 +355,8 @@ class RMSpropCentered(Optimizer):
if self.delta is None:
self.delta = np.zeros_like(dW)
self.mt[:] = self.aleph * self.mt + (1 - self.aleph) * dW
self.vt[:] = self.aleph * self.vt + (1 - self.aleph) * np.square(dW)
self.mt += (1 - self.aleph) * (dW - self.mt)
self.vt += (1 - self.aleph) * (np.square(dW) - self.vt)
# PyTorch has the epsilon outside of the sqrt,
# TensorFlow and the paper have it within.
@ -409,8 +407,8 @@ class Adam(Optimizer):
self.b2_t *= self.b2
# filter
self.mt[:] = self.b1 * self.mt + (1 - self.b1) * dW
self.vt[:] = self.b2 * self.vt + (1 - self.b2) * np.square(dW)
self.mt += (1 - self.b1) * (dW - self.mt)
self.vt += (1 - self.b2) * (np.square(dW) - self.vt)
return -self.lr * (self.mt / (1 - self.b1_t)) \
/ (np.sqrt(self.vt / (1 - self.b2_t)) + self.eps)
@ -452,8 +450,8 @@ class Nadam(Optimizer):
gp = dW / (1 - sched0)
self.mt[:] = self.b1 * self.mt + (1 - self.b1) * dW
self.vt[:] = self.b2 * self.vt + (1 - self.b2) * np.square(dW)
self.mt += (1 - self.b1) * (dW - self.mt)
self.vt += (1 - self.b2) * (np.square(dW) - self.vt)
mtp = self.mt / (1 - sched1)
vtp = self.vt / (1 - self.b2**self.t)