add set_input method to replace feed var in module

paddle_hub/module.py

@@ -235,6 +235,25 @@ class Module(object):
         word_dict = self.config.get_assets_vocab()
         return list(map(lambda x: word_dict[x], inputs))
 
+    def set_input(self, input_dict):
+        assert isinstance(input_dict, dict), "input_dict must be a dict"
+        if not input_dict:
+            logger.warning("the input_dict is empty")
+
+        for key, val in input_dict.items():
+            assert isinstance(
+                val, fluid.framework.Variable
+            ), "the input_dict should be a dict with string-Variable pair"
+            program = val.block.program
+            assert key in program.global_block(
+            ).vars, "can't found input %s in the module" % key
+            input_var = val
+            output_var = program.global_block().var(key)
+            program.global_block()._prepend_op(
+                type="assign",
+                inputs={'X': input_var},
+                outputs={'Out': output_var})
+
 
 class ModuleConfig(object):
     def __init__(self, module_dir, module_name=None):