# coding: utf-8 # Licensed to the Apache Software Foundation (ASF) under one # or more contributor license agreements. See the NOTICE file # distributed with this work for additional information # regarding copyright ownership. The ASF licenses this file # to you 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. import sys, os, logging import mxnet as mx import numpy as np import random import shutil from contextlib import contextmanager from nose.tools import make_decorator import tempfile def try_gpu(gpu_id=0): """Try execute on gpu, if not fallback to cpu""" def test_helper(orig_test): @make_decorator(orig_test) def test_wrapper(*args, **kwargs): try: a = mx.nd.zeros((1,), ctx=mx.gpu(gpu_id)) ctx = mx.gpu(gpu_id) except Exception: ctx = mx.cpu() with ctx: orig_test(*args, **kwargs) return test_wrapper return test_helper def with_cpu(cpu_id=0): """Try execute on gpu, if not fallback to cpu""" def test_helper(orig_test): @make_decorator(orig_test) def test_wrapper(*args, **kwargs): try: a = mx.nd.zeros((1,), ctx=mx.cpu(cpu_id)) ctx = mx.cpu(cpu_id) except Exception: ctx = mx.cpu(0) with ctx: orig_test(*args, **kwargs) return test_wrapper return test_helper def assertRaises(expected_exception, func, *args, **kwargs): try: func(*args, **kwargs) except expected_exception as e: pass else: # Did not raise exception assert False, "%s did not raise %s" % (func.__name__, expected_exception.__name__) def default_logger(): """A logger used to output seed information to nosetests logs.""" logger = logging.getLogger(__name__) # getLogger() lookups will return the same logger, but only add the handler once. if not len(logger.handlers): handler = logging.StreamHandler(sys.stderr) handler.setFormatter(logging.Formatter('[%(levelname)s] %(message)s')) logger.addHandler(handler) if (logger.getEffectiveLevel() == logging.NOTSET): logger.setLevel(logging.INFO) return logger @contextmanager def random_seed(seed=None): """ Runs a code block with a new seed for np, mx and python's random. Parameters ---------- seed : the seed to pass to np.random, mx.random and python's random. To impose rng determinism, invoke e.g. as in: with random_seed(1234): ... To impose rng non-determinism, invoke as in: with random_seed(): ... Upon conclusion of the block, the rng's are returned to a state that is a function of their pre-block state, so any prior non-determinism is preserved. """ try: next_seed = np.random.randint(0, np.iinfo(np.int32).max) if seed is None: np.random.seed() seed = np.random.randint(0, np.iinfo(np.int32).max) logger = default_logger() logger.debug('Setting np, mx and python random seeds = %s', seed) np.random.seed(seed) mx.random.seed(seed) random.seed(seed) yield finally: # Reinstate prior state of np.random and other generators np.random.seed(next_seed) mx.random.seed(next_seed) random.seed(next_seed) def with_seed(seed=None): """ A decorator for nosetests test functions that manages rng seeds. Parameters ---------- seed : the seed to pass to np.random and mx.random This tests decorator sets the np, mx and python random seeds identically prior to each test, then outputs those seeds if the test fails or if the test requires a fixed seed (as a reminder to make the test more robust against random data). @with_seed() def test_ok_with_random_data(): ... @with_seed(1234) def test_not_ok_with_random_data(): ... Use of the @with_seed() decorator for all tests creates tests isolation and reproducibility of failures. When a test fails, the decorator outputs the seed used. The user can then set the environment variable MXNET_TEST_SEED to the value reported, then rerun the test with: nosetests --verbose -s <test_module_name.py>:<failing_test> To run a test repeatedly, set MXNET_TEST_COUNT=<NNN> in the environment. To see the seeds of even the passing tests, add '--logging-level=DEBUG' to nosetests. """ def test_helper(orig_test): @make_decorator(orig_test) def test_new(*args, **kwargs): test_count = int(os.getenv('MXNET_TEST_COUNT', '1')) env_seed_str = os.getenv('MXNET_TEST_SEED') for i in range(test_count): if seed is not None: this_test_seed = seed log_level = logging.INFO elif env_seed_str is not None: this_test_seed = int(env_seed_str) log_level = logging.INFO else: this_test_seed = np.random.randint(0, np.iinfo(np.int32).max) log_level = logging.DEBUG post_test_state = np.random.get_state() np.random.seed(this_test_seed) mx.random.seed(this_test_seed) random.seed(this_test_seed) logger = default_logger() # 'nosetests --logging-level=DEBUG' shows this msg even with an ensuing core dump. test_count_msg = '{} of {}: '.format(i+1,test_count) if test_count > 1 else '' test_msg = ('{}Setting test np/mx/python random seeds, use MXNET_TEST_SEED={}' ' to reproduce.').format(test_count_msg, this_test_seed) logger.log(log_level, test_msg) try: orig_test(*args, **kwargs) except: # With exceptions, repeat test_msg at INFO level to be sure it's seen. if log_level < logging.INFO: logger.info(test_msg) raise finally: np.random.set_state(post_test_state) return test_new return test_helper def setup_module(): """ A function with a 'magic name' executed automatically before each nosetests module (file of tests) that helps reproduce a test segfault by setting and outputting the rng seeds. The segfault-debug procedure on a module called test_module.py is: 1. run "nosetests --verbose test_module.py". A seg-faulting output might be: [INFO] np, mx and python random seeds = 4018804151 test_module.test1 ... ok test_module.test2 ... Illegal instruction (core dumped) 2. Copy the module-starting seed into the next command, then run: MXNET_MODULE_SEED=4018804151 nosetests --logging-level=DEBUG --verbose test_module.py Output might be: [WARNING] **** module-level seed is set: all tests running deterministically **** [INFO] np, mx and python random seeds = 4018804151 test_module.test1 ... [DEBUG] np and mx random seeds = 3935862516 ok test_module.test2 ... [DEBUG] np and mx random seeds = 1435005594 Illegal instruction (core dumped) 3. Copy the segfaulting-test seed into the command: MXNET_TEST_SEED=1435005594 nosetests --logging-level=DEBUG --verbose test_module.py:test2 Output might be: [INFO] np, mx and python random seeds = 2481884723 test_module.test2 ... [DEBUG] np and mx random seeds = 1435005594 Illegal instruction (core dumped) 3. Finally reproduce the segfault directly under gdb (might need additional os packages) by editing the bottom of test_module.py to be if __name__ == '__main__': logging.getLogger().setLevel(logging.DEBUG) test2() MXNET_TEST_SEED=1435005594 gdb -ex r --args python test_module.py 4. When finished debugging the segfault, remember to unset any exported MXNET_ seed variables in the environment to return to non-deterministic testing (a good thing). """ module_seed_str = os.getenv('MXNET_MODULE_SEED') logger = default_logger() if module_seed_str is None: seed = np.random.randint(0, np.iinfo(np.int32).max) else: seed = int(module_seed_str) logger.warn('*** module-level seed is set: all tests running deterministically ***') logger.info('Setting module np/mx/python random seeds, use MXNET_MODULE_SEED=%s to reproduce.', seed) np.random.seed(seed) mx.random.seed(seed) random.seed(seed) # The MXNET_TEST_SEED environment variable will override MXNET_MODULE_SEED for tests with # the 'with_seed()' decoration. Inform the user of this once here at the module level. if os.getenv('MXNET_TEST_SEED') is not None: logger.warn('*** test-level seed set: all "@with_seed()" tests run deterministically ***') try: from tempfile import TemporaryDirectory except: # really simple implementation of TemporaryDirectory class TemporaryDirectory(object): def __init__(self, suffix='', prefix='', dir=''): self._dirname = tempfile.mkdtemp(suffix, prefix, dir) def __enter__(self): return self._dirname def __exit__(self, exc_type, exc_value, traceback): shutil.rmtree(self._dirname)