[MAIN] remove class that was never used.

theano/gof/__init__.py

@@ -61,7 +61,7 @@ from theano.gof.opt import (
     Optimizer,
     optimizer, inplace_optimizer,
     SeqOptimizer,
-    MergeOptimizer, MergeOptMerge,
+    MergeOptimizer,
     LocalOptimizer, local_optimizer, LocalOptGroup,
     OpSub, OpRemove, PatternSub,
     NavigatorOptimizer, TopoOptimizer, EquilibriumOptimizer,

theano/gof/opt.py

@@ -708,18 +708,6 @@ def is_same_graph_with_merge(var1, var2, givens=None):
         return o1 is o2
 
 
-def MergeOptMerge(opt):
-    """WRITEME
-    Returns an Optimizer that merges the graph then applies the
-    optimizer in opt and then merges the graph again in case the
-    opt introduced additional similarities.
-    """
-    merger = merge_optimizer
-    opt = SeqOptimizer([merger, opt, merger])
-    opt.name = "MergeOptMerge"
-    return opt
-
-
 def pre_constant_merge(vars):
     """
     Merge constants in the subgraph used to compute nodes in `vars`.