add pt2tf tool

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

@@ -0,0 +1,23 @@
+import tensorflow as tf
+
+from onnx_tf.handlers.backend_handler import BackendHandler
+from onnx_tf.handlers.handler import onnx_op
+
+
+@onnx_op("ThresholdedRelu")
+class ThresholdedRelu(BackendHandler):
+
+  @classmethod
+  def _common(cls, node, **kwargs):
+    x = kwargs["tensor_dict"][node.inputs[0]]
+    alpha = node.attrs.get("alpha", 1.0)
+    epsilon = 1e-5
+    return [tf.nn.relu(x) - tf.nn.relu(tf.sign(alpha - x + epsilon) * x)]
+
+  @classmethod
+  def version_1(cls, node, **kwargs):
+    return cls._common(node, **kwargs)
+
+  @classmethod
+  def version_10(cls, node, **kwargs):
+    return cls._common(node, **kwargs)