add pt2tf tool

pt2tf/onnx-tensorflow/onnx_tf/handlers/backend/reduce_mean.py

@@ -0,0 +1,19 @@
+import tensorflow as tf
+
+from onnx_tf.handlers.backend_handler import BackendHandler
+from onnx_tf.handlers.handler import onnx_op
+from onnx_tf.handlers.handler import tf_func
+from .math_mixin import ReductionMixin
+
+
+@onnx_op("ReduceMean")
+@tf_func(tf.reduce_mean)
+class ReduceMean(ReductionMixin, BackendHandler):
+
+  @classmethod
+  def version_1(cls, node, **kwargs):
+    return cls._common(node, **kwargs)
+
+  @classmethod
+  def version_11(cls, node, **kwargs):
+    return cls._common(node, **kwargs)