Add placeholder agent for HRED model

parlai/agents/hred/__init__.py

@@ -0,0 +1,5 @@
+# Copyright (c) 2017-present, Facebook, Inc.
+# All rights reserved.
+# This source code is licensed under the BSD-style license found in the
+# LICENSE file in the root directory of this source tree. An additional grant
+# of patent rights can be found in the PATENTS file in the same directory.

parlai/agents/hred/hred.py

@@ -0,0 +1,12 @@
+# Copyright (c) 2017-present, Facebook, Inc.
+# All rights reserved.
+# This source code is licensed under the BSD-style license found in the
+# LICENSE file in the root directory of this source tree. An additional grant
+# of patent rights can be found in the PATENTS file in the same directory.
+
+from parlai.core.agents import Agent
+
+class HredAgent(Agent):
+
+    def __init__(self, opt, shared=None):
+        raise RuntimeError("Work on this model is currently in progress")