Added code for Learned Optimizers that Scale and Generalize

learned_optimizer/problems/problem_spec.py

+# Copyright 2017 Google, Inc. 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.
+# ==============================================================================
+
+"""Wrapper around a training problem."""
+
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+
+from collections import namedtuple
+
+
+class Spec(namedtuple("Spec", "callable args kwargs")):
+  """Syntactic sugar for keeping track of a function/class + args."""
+
+  # Since this is an immutable object, we don't need to reserve slots.
+  __slots__ = ()
+
+  def build(self):
+    """Returns the output of the callable."""
+    return self.callable(*self.args, **self.kwargs)