reset the index before starting to loop

theano/sandbox/scan_module/scan_op.py

@@ -277,6 +277,7 @@ class ScanOp(PureOp):
                 for var, length, val in state_buffers:
                     var.set_value(val[0], borrow=True)
                     length.set_value(val[0].shape[0], borrow=True)
+                self.index.set_value(numpy.int64(0))
                 # grab fixed arguments
                 fix_args = [x[0] for x in non_tensor_buffers]
                 while cont and pos < node_input_storage[0][0]:
@@ -320,6 +321,7 @@ class ScanOp(PureOp):
                 for var, length, val in state_buffers:
                     var.set_value(val[0], borrow=True)
                     length.set_value(val[0].shape[0], borrow=True)
+                self.index.set_value(numpy.int64(0))
                 # grab fixed arguments
                 fix_args = [x[0] for x in non_tensor_buffers]
                 for dx in xrange(node_input_storage[0][0]):