{"action":"created","comment":{"url":"https://api.github.com/repos/pfnet/chainer/pulls/comments/49424216","id":49424216,"diff_hunk":"@@ -261,6 +514,46 @@ def for_int_dtypes(name='dtype', no_bool=False):\n \n \n def for_dtypes_combination(types, names=['dtype'], full=None):\n+    \"\"\"Decorator that checks the fixture with a product set of dtypes.\n+\n+    Args:\n+         types(list of dtypes): dtypes to be tested.\n+         names(list of str): Argument names to which dtypes are passed.\n+         full(bool): If ``True``, then all combinations\n+             of dtypes will be tested.\n+             Otherwise, the subset of combinations will be tested\n+             (see the description below).\n+\n+    Decorator adds the keyword arguments specified by ``names``\n+    to the test fixture. Then, it runs the fixture with passing\n+    (possibly, a subset of) a product set of dtypes.\n+    The range of dtypes is specified by ``types``.\n+\n+    The combination of dtypes to be tested changes depending\n+    on the option ``full``. If ``full`` is ``True``,\n+    all combinations of ``types`` are tested.\n+    Sometimes, such an exhaustive test can be costly.\n+    So, if ``full`` is ``False``, only a subset of possible\n+    combinations is tested. Specificially, at first,\n+    the shuffled list of ``types`` are made for each argument\n+    (say, :math:`D1`, :math:`D2`, ..., :math:`Dn`\n+    where :math:`n` is the number of arguments).\n+    Then, the combinations to be tested will be ``zip(D1, ..., Dn)``.\n+    If ``full`` is ``None``, the behaivior is switched\n+    by setting the environment variable ``CUPY_TEST_FULL_COMBINATION=1``.\n+\n+    For example, let ``types`` be ``[float16, float32, float64]``\n+    and ``names`` be ``[a_type, b_type]``. If ``full`` is ``True``,\n+    then the decorated test fixture is executed with all\n+    :math:`2 ** 3` patterns. On the other hand, if ``full``is ``False``,\n+    shuffled lists are made for ``a_type`` and ``b_type``.\n+    Suppose the lists are (``16``, ``64``, ``32``) for `a` and","path":"cupy/testing/helper.py","position":377,"original_position":377,"commit_id":"e3b68ab7d398a4b0f3c608c1e7243142e063e49e","original_commit_id":"e3b68ab7d398a4b0f3c608c1e7243142e063e49e","user":{"login":"unnonouno","id":740680,"avatar_url":"https://avatars.githubusercontent.com/u/740680?v=3","gravatar_id":"","url":"https://api.github.com/users/unnonouno","html_url":"https://github.com/unnonouno","followers_url":"https://api.github.com/users/unnonouno/followers","following_url":"https://api.github.com/users/unnonouno/following{/other_user}","gists_url":"https://api.github.com/users/unnonouno/gists{/gist_id}","starred_url":"https://api.github.com/users/unnonouno/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/unnonouno/subscriptions","organizations_url":"https://api.github.com/users/unnonouno/orgs","repos_url":"https://api.github.com/users/unnonouno/repos","events_url":"https://api.github.com/users/unnonouno/events{/privacy}","received_events_url":"https://api.github.com/users/unnonouno/received_events","type":"User","site_admin":false},"body":"I 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