add pt2tf tool

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

@@ -0,0 +1,38 @@
+import tensorflow as tf
+
+from onnx_tf.handlers.backend_handler import BackendHandler
+from onnx_tf.handlers.handler import onnx_op
+from .broadcast_mixin import BroadcastMixin
+
+
+@onnx_op("PRelu")
+class PRelu(BackendHandler):
+
+  @classmethod
+  def _common(cls, node, **kwargs):
+    """
+    Reference implementation at
+    https://github.com/tflearn/tflearn/blob/4ba8c8d78bf1bbdfc595bf547bad30580cb4c20b/tflearn/activations.py#L191
+    """
+    tensor_dict = kwargs["tensor_dict"]
+    x = tensor_dict[node.inputs[0]]
+    slope = BroadcastMixin.explicit_broadcast([x, tensor_dict[node.inputs[1]]])
+    pos = tf.nn.relu(x)
+    neg = slope * (x - abs(x)) * 0.5
+    return [pos + neg]
+
+  @classmethod
+  def version_1(cls, node, **kwargs):
+    return cls._common(node, **kwargs)
+
+  @classmethod
+  def version_6(cls, node, **kwargs):
+    return cls._common(node, **kwargs)
+
+  @classmethod
+  def version_7(cls, node, **kwargs):
+    return cls._common(node, **kwargs)
+
+  @classmethod
+  def version_9(cls, node, **kwargs):
+    return cls._common(node, **kwargs)