implemented theano.gof.utils.get_theano_flag to parse the THEANO_FLAGS env variable and use it.

theano/compile/profilemode.py

@@ -5,6 +5,7 @@ from theano.gof.cutils import run_cthunk
 from theano.compile.mode import Mode, register_mode, predefined_modes, predefined_linkers, predefined_optimizers, default_linker, default_optimizer
 from theano.gof.cc import OpWiseCLinker
 from theano import gof
+from theano.gof.utils import get_theano_flag
 
 class ProfileMode(Mode):
     def __init__(self, linker=default_linker, optimizer=default_optimizer):
@@ -85,6 +86,10 @@ class ProfileMode(Mode):
 
         param: n_ops_to_print the number of ops to print. Default 20.
         """
+
+        n_ops_to_print=int(get_theano_flag("n_ops_to_print", n_ops_to_print))
+        n_apply_to_print=int(get_theano_flag("n_apply_to_print", n_apply_to_print))
+        
         local_time = self.local_time[0]
         compile_time = self.compile_time
         apply_time = self.apply_time

theano/gof/utils.py

@@ -2,7 +2,7 @@
 # import op
 # import variable
 
-import re
+import re, os
 
 def hashgen():
     hashgen.next += 1
@@ -369,3 +369,27 @@ def type_guard(type1):
         return new_f
     return wrap
 
+
+def get_theano_flag(key, default=None):
+    """
+    This function parse the environement variable THEANO_FLAGS.
+
+    if the variable don't exist return None
+    if the key is not in the variable return None
+    if the key is in the variable but without a value return True
+    if the key is in the variable with a value return the value
+
+    if the key appear many times, we return the last value
+
+    the THEANO_FLAGS environement variable is a list of key[=value] that is separated by comma.
+    """
+    f=os.getenv("THEANO_FLAGS")
+    ret = default
+    key2=key+"="
+    for fl in f.split(','):
+        if fl==key:
+            ret = True
+        elif fl.startswith(key2):
+            ret = fl.split('=',1)[1]
+                
+    return ret

theano/tensor/opt.py

@@ -8,7 +8,7 @@ _logger = logging.getLogger('theano.tensor.opt')
 
 from theano import gof
 from theano.gof import opt, InconsistencyError, TopoOptimizer, graph
-from theano.gof.utils import MethodNotDefined
+from theano.gof.utils import MethodNotDefined, get_theano_flag
 from elemwise import Elemwise, DimShuffle
 from theano import scalar
 import basic as T
@@ -1339,13 +1339,10 @@ def local_elemwise_fusion(node):
 #    print "local_elemwise_fusion: FUSED",nb_elemwise+1,"elemwise!"
     return n.outputs
 
-flags=os.getenv('THEANO_FLAGS',None)
-if flags:
-    flags=flags.split(',')
-    if 'local_elemwise_fusion' in flags:
+if get_theano_flag('local_elemwise_fusion',False):
     _logger.debug("enabling optimization: fusion elemwise")
     register_specialize(local_elemwise_fusion)
-    else:
+else:
     _logger.debug("not enabling optimization: fusion elemwise")
 
 # def make_composite(inputs, outputs):