add pt2tf tool

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

@@ -0,0 +1,32 @@
+import copy
+
+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("Unsqueeze")
+@tf_func(tf.expand_dims)
+class Unsqueeze(BackendHandler):
+
+  @classmethod
+  def _common(cls, node, **kwargs):
+    attrs = copy.deepcopy(node.attrs)
+    axes = attrs.pop("axes")
+    if len(axes) != 1:
+      x = kwargs["tensor_dict"][node.inputs[0]]
+      for axis in sorted(axes):
+        x = tf.expand_dims(x, axis=axis)
+      return [x]
+    attrs["axis"] = axes[0]
+    return [cls.make_tensor_from_onnx_node(node, attrs=attrs, **kwargs)]
+
+  @classmethod
+  def version_1(cls, node, **kwargs):
+    return cls._common(node, **kwargs)
+
+  @classmethod
+  def version_11(cls, node, **kwargs):
+    return cls._common(node, **kwargs)