add pt2tf tool

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

@@ -0,0 +1,22 @@
+import tensorflow as tf
+
+from onnx_tf.handlers.backend_handler import BackendHandler
+from onnx_tf.handlers.handler import onnx_op
+
+
+@onnx_op("Expand")
+class Expand(BackendHandler):
+
+  @classmethod
+  def version_8(cls, node, **kwargs):
+    tensor_dict = kwargs["tensor_dict"]
+    x, shape = tensor_dict[node.inputs[0]], tensor_dict[node.inputs[1]]
+
+    # tf.math.multiply does not support bool therefore use int8
+    if x.dtype is tf.bool:
+      ones = tf.ones(shape, dtype=tf.int8)
+      r = tf.cast(x, tf.int8) * ones
+      return [tf.cast(r, tf.bool)]
+    else:
+      ones = tf.ones(shape, dtype=x.dtype)
+      return [x * ones]