enable dots in section names

Config parameters in CUDNN v3 have more than one hierarchy level (i.e.dnn.conv.algo_fwd). This patch allows to override these values within .theanorc

enable dots in section names
de787b0c · Michael Opitz · 51a26add · de787b0c
--- a/theano/configparser.py
+++ b/theano/configparser.py
@@ -144,7 +144,7 @@ def fetch_val_for_key(key):
    # next try to find it in the config file

    # config file keys can be of form option, or section.option
-    key_tokens = key.split('.')
+    key_tokens = key.rsplit('.', 1)
    if len(key_tokens) > 2:
        raise KeyError(key)