ref: e02dc84c1aae3a0c22c8c225c8e7b34335d1379b
parent: 4505e8accbe2b88a029f20fc0cc0cddc966e42cd
author: Deb Mukherjee <debargha@google.com>
date: Tue Aug 27 11:07:50 EDT 2013
Adds a speed feature for fast 1-loop forw updates
Incorporates a speed feature for fast forward updates of
coefficients. This feature takes 3 values:
0 - use standard 2-loop version
1 - use a 1-loop version
2 - use a 1-loop version with reduced updates
Results: derfraw300 +0.007% (on speed 0) at feature value = 1
-0.160% (on speed 0) at feature value = 2
There is substantial speed up at speeds 2 and above for low
resolution sequences where the entropy updates are a big part
of the overall computations.
Change-Id: Ie96fc50777088a5bd441288bca6111e43d03bcae