From 88b21a9e080c30e3ffa205f5315bcc461f651341 Mon Sep 17 00:00:00 2001
From: wuzewu <wuzewu@baidu.com>
Date: Mon, 7 Jan 2019 16:18:27 +0800
Subject: [PATCH] add signature class and method

---
 paddle_hub/signature.py | 53 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 paddle_hub/signature.py

diff --git a/paddle_hub/signature.py b/paddle_hub/signature.py
new file mode 100644
index 00000000..9cf4aeb8
--- /dev/null
+++ b/paddle_hub/signature.py
@@ -0,0 +1,53 @@
+#   Copyright (c) 2019  PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+from paddle.fluid.framework import Variable
+from paddle_hub.utils import to_list
+
+
+class Signature:
+    def __init__(self, name, inputs, outputs):
+        self.name = name
+        inputs = to_list(inputs)
+        outputs = to_list(outputs)
+
+        for item in inputs:
+            assert isinstance(
+                item,
+                Variable), "the item of inputs list shoule be paddle Variable"
+
+        for item in outputs:
+            assert isinstance(
+                item,
+                Variable), "the item of outputs list shoule be paddle Variable"
+
+        self.inputs = inputs
+        self.outputs = outputs
+
+    def get_name(self):
+        return self.name
+
+    def get_inputs(self):
+        return self.inputs
+
+    def get_outputs(self):
+        return self.outputs
+
+
+def create_signature(name="defalut", inputs=[], outputs=[]):
+
+    return Signature(name=name, inputs=inputs, outputs=outputs)
-- 
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