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# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
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#     http://www.apache.org/licenses/LICENSE-2.0
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"""Define the abstract class for contextual bandit algorithms."""

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function


class BanditAlgorithm(object):
  """A bandit algorithm must be able to do two basic operations.

  1. Choose an action given a context.
  2. Update its internal model given a triple (context, played action, reward).
  """

  def action(self, context):
    pass

  def update(self, context, action, reward):
    pass
