add pt2tf tool

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

@@ -0,0 +1,27 @@
+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
+
+
+@onnx_op("Concat")
+@tf_func(tf.concat)
+class Concat(BackendHandler):
+
+  @classmethod
+  def _common(cls, node, **kwargs):
+    inputs = [kwargs["tensor_dict"][inp] for inp in node.inputs]
+    return [cls.make_tensor_from_onnx_node(node, inputs=[inputs])]
+
+  @classmethod
+  def version_1(cls, node, **kwargs):
+    return cls._common(node, **kwargs)
+
+  @classmethod
+  def version_4(cls, node, **kwargs):
+    return cls._common(node, **kwargs)
+
+  @classmethod
+  def version_11(cls, node, **kwargs):
+    return cls._common(node, **kwargs)