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

"""Tests for code_tasks."""

import numpy as np
import tensorflow as tf

from single_task import code_tasks  # brain coder
from single_task import defaults  # brain coder


def pad(string, pad_length, pad_char):
  return string + pad_char * (pad_length - len(string))


class CodeTasksTest(tf.test.TestCase):

  def assertClose(self, a, b):
    self.assertTrue(
        np.isclose(a, b, atol=1e-4),
        'Expecting approximately equal values. Got: %s, %s' % (a, b))

  def testMultiIOTaskManager(self):
    maxlen = 100
    padchr = '['
    task = code_tasks.make_paper_task(
        'print', timestep_limit=maxlen, do_code_simplification=False)
    reward_fns = task.rl_batch(1)
    r = reward_fns[0]
    self.assertClose(
        r(pad('++++++++.---.+++++++...', maxlen, padchr)).episode_rewards[-1],
        0.2444)
    self.assertClose(
        r(pad('++++++++.---.+++++++..+++.',
              maxlen, padchr)).episode_rewards[-1],
        1.0)

    task = code_tasks.make_paper_task(
        'print', timestep_limit=maxlen, do_code_simplification=True)
    reward_fns = task.rl_batch(1)
    r = reward_fns[0]
    self.assertClose(
        r('++++++++.---.+++++++...').episode_rewards[-1],
        0.2444)
    self.assertClose(
        r('++++++++.---.+++++++..+++.').episode_rewards[-1],
        0.935)
    self.assertClose(
        r(pad('++++++++.---.+++++++..+++.',
              maxlen, padchr)).episode_rewards[-1],
        0.75)

    task = code_tasks.make_paper_task(
        'reverse', timestep_limit=maxlen, do_code_simplification=False)
    reward_fns = task.rl_batch(1)
    r = reward_fns[0]
    self.assertClose(
        r(pad('>,>,>,.<.<.<.', maxlen, padchr)).episode_rewards[-1],
        0.1345)
    self.assertClose(
        r(pad(',[>,]+[,<.]', maxlen, padchr)).episode_rewards[-1],
        1.0)

    task = code_tasks.make_paper_task(
        'reverse', timestep_limit=maxlen, do_code_simplification=True)
    reward_fns = task.rl_batch(1)
    r = reward_fns[0]
    self.assertClose(r('>,>,>,.<.<.<.').episode_rewards[-1], 0.1324)
    self.assertClose(r(',[>,]+[,<.]').episode_rewards[-1], 0.9725)
    self.assertClose(
        r(pad(',[>,]+[,<.]', maxlen, padchr)).episode_rewards[-1],
        0.75)

  def testMakeTask(self):
    maxlen = 100
    padchr = '['
    config = defaults.default_config_with_updates(
        'env=c(config_for_iclr=False,fixed_string=[8,5,12,12,15])')
    task = code_tasks.make_task(config.env, 'print', timestep_limit=maxlen)
    reward_fns = task.rl_batch(1)
    r = reward_fns[0]
    self.assertClose(
        r('++++++++.---.+++++++...').episode_rewards[-1],
        0.2444)
    self.assertClose(
        r('++++++++.---.+++++++..+++.').episode_rewards[-1],
        0.935)
    self.assertClose(
        r(pad('++++++++.---.+++++++..+++.',
              maxlen, padchr)).episode_rewards[-1],
        0.75)

  def testKnownCodeBaseTask(self):
    maxlen = 100
    padchr = '['
    task = code_tasks.make_paper_task(
        'shift-left', timestep_limit=maxlen, do_code_simplification=False)
    reward_fns = task.rl_batch(1)
    r = reward_fns[0]
    self.assertClose(
        r(pad(',>,[.,]<.,.', maxlen, padchr)).episode_rewards[-1],
        1.0)


if __name__ == '__main__':
  tf.test.main()