X-Git-Url: https://www.fleuret.org/cgi-bin/gitweb/gitweb.cgi?a=blobdiff_plain;f=README.md;h=a774d628c37ca6706d4cb269b552b57ac8edcd55;hb=abbbb61852f54e90df6ac5b5f4dcb71d06f88f49;hp=95e6206c186b77b49b055de64326fb2dea6ad4b3;hpb=96715f555094d276c72060ee9610bcda288d04fd;p=pysvrt.git

diff --git a/README.md b/README.md
index 95e6206..a774d62 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,28 @@ The returned ByteTensor has three dimensions:
  * Pixel row
  * Pixel col
 
+Two functions additional functions
+
+```
+torch.ByteStorage svrt.compress(torch.ByteStorage x)
+```
+
+and
+
+```
+torch.ByteStorage svrt.uncompress(torch.ByteStorage x)
+```
+
+provides a lossless compression scheme adapted to the ByteStorage of
+the vignette ByteTensor (i.e. expecting a lot of 255s, a few 0s, and
+no other value).
+
+They allow to reduce the memory footprint by a factor ~50, and may be
+usefull to deal with very large data-sets and avoid re-generating
+images at every batch.
+
+See vignette_set.py for a class CompressedVignetteSet using it.
+
 # Installation and test #
 
 Executing
@@ -32,5 +54,5 @@ make -j -k
 should generate an image example.png in the current directory.
 
 Note that the image generation does not take advantage of GPUs or
-multi-core, and can be as fast as 3,000 vignettes per second and as
+multi-core, and can be as fast as 10,000 vignettes per second and as
 slow as 40 on a 4GHz i7-6700K.