CCW#37: Implemented inplace optimization for Remove0 sparse operator.

theano/tensor/opt.py

@@ -1948,6 +1948,20 @@ compile.optdb.register('local_inplace_incsubtensor1',
         failure_callback=TopoOptimizer.warn_inplace),
                        60, 'fast_run', 'inplace')  # DEBUG
 
+@gof.local_optimizer([None])
+def local_inplace_remove0(node):
+    """
+    """
+    if isinstance(node.op, theano.sparse.sandbox.sp.Remove0) and not node.op.inplace:
+        new_op = node.op.__class__(inplace=True)
+        new_node = new_op(*node.inputs)
+        return [new_node]
+    return False
+compile.optdb.register('local_inplace_remove0',
+                       TopoOptimizer(local_inplace_remove0,
+    failure_callback=TopoOptimizer.warn_inplace), 60,
+                       'fast_run', 'inplace')  # DEBUG
+
 
 @register_canonicalize
 @register_stabilize