Bring back the PR `Refactor doctests + add CI` to `main` (#23271)

* Revert "Revert "[Doctests] Refactor doctests + add CI" (#23245)"

This reverts commit 69ee4624

.

* try not expose HfDocTestParser

* move into testing_utils.py

* remove pytest install

---------
Co-authored-by: ydshieh <ydshieh@users.noreply.github.com>

.circleci/create_circleci_config.py

@@ -51,6 +51,8 @@ class CircleCIJob:
     resource_class: Optional[str] = "xlarge"
     tests_to_run: Optional[List[str]] = None
     working_directory: str = "~/transformers"
+    # This should be only used for doctest job!
+    command_timeout: Optional[int] = None
 
     def __post_init__(self):
         # Deal with defaults for mutable attributes.
@@ -107,11 +109,15 @@ class CircleCIJob:
         steps.append({"store_artifacts": {"path": "~/transformers/installed.txt"}})
 
         all_options = {**COMMON_PYTEST_OPTIONS, **self.pytest_options}
-        pytest_flags = [f"--{key}={value}" if value is not None else f"-{key}" for key, value in all_options.items()]
+        pytest_flags = [f"--{key}={value}" if (value is not None or key in ["doctest-modules"]) else f"-{key}" for key, value in all_options.items()]
         pytest_flags.append(
             f"--make-reports={self.name}" if "examples" in self.name else f"--make-reports=tests_{self.name}"
         )
-        test_command = f"python -m pytest -n {self.pytest_num_workers} " + " ".join(pytest_flags)
+        test_command = ""
+        if self.command_timeout:
+            test_command = f"timeout {self.command_timeout} "
+        test_command += f"python -m pytest -n {self.pytest_num_workers} " + " ".join(pytest_flags)
+        
         if self.parallelism == 1:
             if self.tests_to_run is None:
                 test_command += " << pipeline.parameters.tests_to_run >>"
@@ -161,12 +167,37 @@ class CircleCIJob:
             steps.append({"store_artifacts": {"path": "~/transformers/tests.txt"}})
             steps.append({"store_artifacts": {"path": "~/transformers/splitted_tests.txt"}})
 
-            test_command = f"python -m pytest -n {self.pytest_num_workers} " + " ".join(pytest_flags)
+            test_command = ""
+            if self.timeout:
+                test_command = f"timeout {self.timeout} "
+            test_command += f"python -m pytest -n {self.pytest_num_workers} " + " ".join(pytest_flags)
             test_command += " $(cat splitted_tests.txt)"
         if self.marker is not None:
             test_command += f" -m {self.marker}"
+
+        if self.name == "pr_documentation_tests":
+            # can't use ` | tee tee tests_output.txt` as usual
+            test_command += " > tests_output.txt"
+            # Save the return code, so we can check if it is timeout in the next step.
+            test_command += '; touch "$?".txt'
+            # Never fail the test step for the doctest job. We will check the results in the next step, and fail that
+            # step instead if the actual test failures are found. This is to avoid the timeout being reported as test
+            # failure.
+            test_command = f"({test_command}) || true"
+        else:
             test_command += " | tee tests_output.txt"
         steps.append({"run": {"name": "Run tests", "command": test_command}})
+
+        # return code `124` means the previous (pytest run) step is timeout
+        if self.name == "pr_documentation_tests":
+            checkout_doctest_command = 'if [ -s reports/tests_pr_documentation_tests/failures_short.txt ]; '
+            checkout_doctest_command += 'then echo "some test failed"; '
+            checkout_doctest_command += 'cat reports/tests_pr_documentation_tests/failures_short.txt; '
+            checkout_doctest_command += 'cat reports/tests_pr_documentation_tests/summary_short.txt; exit -1; '
+            checkout_doctest_command += 'elif [ -s reports/tests_pr_documentation_tests/stats.txt ]; then echo "All tests pass!"; '
+            checkout_doctest_command += 'elif [ -f 124.txt ]; then echo "doctest timeout!"; else echo "other fatal error)"; exit -1; fi;'
+            steps.append({"run": {"name": "Check doctest results", "command": checkout_doctest_command}})
+
         steps.append({"store_artifacts": {"path": "~/transformers/tests_output.txt"}})
         steps.append({"store_artifacts": {"path": "~/transformers/reports"}})
         job["steps"] = steps
@@ -401,6 +432,51 @@ repo_utils_job = CircleCIJob(
     tests_to_run="tests/repo_utils",
 )
 
+# At this moment, only the files that are in `utils/documentation_tests.txt` will be kept (together with a dummy file).
+py_command = 'import os; import json; fp = open("pr_documentation_tests.txt"); data_1 = fp.read().strip().split("\\n"); fp = open("utils/documentation_tests.txt"); data_2 = fp.read().strip().split("\\n"); to_test = [x for x in data_1 if x in set(data_2)] + ["dummy.py"]; to_test = " ".join(to_test); print(to_test)'
+py_command = f"$(python3 -c '{py_command}')"
+command = f'echo "{py_command}" > pr_documentation_tests_filtered.txt'
+doc_test_job = CircleCIJob(
+    "pr_documentation_tests",
+    additional_env={"TRANSFORMERS_VERBOSITY": "error", "DATASETS_VERBOSITY": "error", "SKIP_CUDA_DOCTEST": "1"},
+    install_steps=[
+        "sudo apt-get -y update && sudo apt-get install -y libsndfile1-dev espeak-ng time",
+        "pip install --upgrade pip",
+        "pip install -e .[dev]",
+        "pip install git+https://github.com/huggingface/accelerate",
+        "pip install --upgrade pytest pytest-sugar",
+        "find -name __pycache__ -delete",
+        "find . -name \*.pyc -delete",
+        # Add an empty file to keep the test step running correctly even no file is selected to be tested.
+        "touch dummy.py",
+        {
+            "name": "Get files to test",
+            "command":
+                "git remote add upstream https://github.com/huggingface/transformers.git && git fetch upstream \n"
+                "git diff --name-only --relative --diff-filter=AMR refs/remotes/upstream/main...HEAD | grep -E '\.(py|mdx)$' | grep -Ev '^\..*|/\.' | grep -Ev '__' > pr_documentation_tests.txt"
+        },
+        {
+            "name": "List files beings changed: pr_documentation_tests.txt",
+            "command":
+                "cat pr_documentation_tests.txt"
+        },
+        {
+            "name": "Filter pr_documentation_tests.txt",
+            "command":
+                command
+        },
+        {
+            "name": "List files beings tested: pr_documentation_tests_filtered.txt",
+            "command":
+                "cat pr_documentation_tests_filtered.txt"
+        },
+    ],
+    tests_to_run="$(cat pr_documentation_tests_filtered.txt)",  # noqa
+    pytest_options={"-doctest-modules": None, "doctest-glob": "*.mdx", "dist": "loadfile", "rvsA": None},
+    command_timeout=1200,  # test cannot run longer than 1200 seconds
+    pytest_num_workers=1,
+)
+
 REGULAR_TESTS = [
     torch_and_tf_job,
     torch_and_flax_job,
@@ -411,6 +487,7 @@ REGULAR_TESTS = [
     hub_job,
     onnx_job,
     exotic_models_job,
+    doc_test_job
 ]
 EXAMPLES_TESTS = [
     examples_torch_job,

.github/workflows/doctests.yml

@@ -37,18 +37,10 @@ jobs:
       - name: Show installed libraries and their versions
         run: pip freeze
 
-      - name: Prepare files for doctests
-        run: |
-          python3 utils/prepare_for_doc_test.py src docs
-
       - name: Run doctests
         run: |
           python3 -m pytest -v --make-reports doc_tests_gpu --doctest-modules $(cat utils/documentation_tests.txt) -sv --doctest-continue-on-failure --doctest-glob="*.mdx"
 
-      - name: Clean files after doctests
-        run: |
-          python3 utils/prepare_for_doc_test.py src docs --remove_new_line
-
       - name: Failure short reports
         if: ${{ failure() }}
         continue-on-error: true

Makefile

@@ -47,10 +47,10 @@ repo-consistency:
 # this target runs checks on all files
 
 quality:
-	black --check $(check_dirs) setup.py
+	black --check $(check_dirs) setup.py conftest.py
 	python utils/custom_init_isort.py --check_only
 	python utils/sort_auto_mappings.py --check_only
-	ruff $(check_dirs) setup.py
+	ruff $(check_dirs) setup.py conftest.py
 	doc-builder style src/transformers docs/source --max_len 119 --check_only --path_to_docs docs/source
 	python utils/check_doc_toc.py
 
@@ -65,8 +65,8 @@ extra_style_checks:
 # this target runs checks on all files and potentially modifies some of them
 
 style:
-	black $(check_dirs) setup.py
-	ruff $(check_dirs) setup.py --fix
+	black $(check_dirs) setup.py conftest.py
+	ruff $(check_dirs) setup.py conftest.py --fix
 	${MAKE} autogenerate_code
 	${MAKE} extra_style_checks
 

conftest.py

@@ -20,6 +20,10 @@ import sys
 import warnings
 from os.path import abspath, dirname, join
 
+import _pytest
+
+from transformers.testing_utils import HfDoctestModule, HfDocTestParser
+
 
 # allow having multiple repository checkouts and not needing to remember to rerun
 # 'pip install -e .[dev]' when switching between checkouts and running tests.
@@ -38,9 +42,7 @@ def pytest_configure(config):
     config.addinivalue_line(
         "markers", "is_pt_flax_cross_test: mark test to run only when PT and FLAX interactions are tested"
     )
-    config.addinivalue_line(
-        "markers", "is_pipeline_test: mark test to run only when pipelines are tested"
-    )
+    config.addinivalue_line("markers", "is_pipeline_test: mark test to run only when pipelines are tested")
     config.addinivalue_line("markers", "is_staging_test: mark test to run only in the staging environment")
     config.addinivalue_line("markers", "accelerate_tests: mark test that require accelerate")
     config.addinivalue_line("markers", "tool_tests: mark the tool tests that are run on their specific schedule")
@@ -67,7 +69,7 @@ def pytest_sessionfinish(session, exitstatus):
 
 
 # Doctest custom flag to ignore output.
-IGNORE_RESULT = doctest.register_optionflag('IGNORE_RESULT')
+IGNORE_RESULT = doctest.register_optionflag("IGNORE_RESULT")
 
 OutputChecker = doctest.OutputChecker
 
@@ -80,3 +82,5 @@ class CustomOutputChecker(OutputChecker):
 
 
 doctest.OutputChecker = CustomOutputChecker
+_pytest.doctest.DoctestModule = HfDoctestModule
+doctest.DocTestParser = HfDocTestParser

docs/source/en/testing.mdx

@@ -212,20 +212,12 @@ Example:
     ```"""
 
 ```
-3 steps are required to debug the docstring examples: 
-1. In order to properly run the test, **an extra line has to be added** at the end of the docstring. This can be automatically done on any file using: 
-```bash 
-python utils/prepare_for_doc_test.py <path_to_file_or_dir>
-```
 
-2. Then, you can use the following line to automatically test every docstring example in the desired file: 
+Just run the following line to automatically test every docstring example in the desired file: 
 ```bash 
 pytest --doctest-modules <path_to_file_or_dir>
 ```
-3. Once you are done debugging, you need to remove the extra line added in step **1.** by running the following: 
-```bash 
-python utils/prepare_for_doc_test.py <path_to_file_or_dir> --remove_new_line
-```
+If the file has a markdown extention, you should add the `--doctest-glob="*.mdx"` argument.
 
 ### Run only modified tests
 

setup.cfg

 [tool:pytest]
 doctest_optionflags=NUMBER NORMALIZE_WHITESPACE ELLIPSIS
+doctest_glob=**/*.mdx
\ No newline at end of file

src/transformers/testing_utils.py

@@ -14,6 +14,7 @@
 
 import collections
 import contextlib
+import doctest
 import functools
 import inspect
 import logging
@@ -30,11 +31,23 @@ import unittest
 from collections.abc import Mapping
 from io import StringIO
 from pathlib import Path
-from typing import Iterator, List, Optional, Union
+from typing import Iterable, Iterator, List, Optional, Union
 from unittest import mock
 
 import huggingface_hub
 import requests
+from _pytest.doctest import (
+    Module,
+    _get_checker,
+    _get_continue_on_failure,
+    _get_runner,
+    _is_mocked,
+    _patch_unwrap_mock_aware,
+    get_optionflags,
+    import_path,
+)
+from _pytest.outcomes import skip
+from pytest import DoctestItem
 
 from transformers import logging as transformers_logging
 
@@ -1812,3 +1825,162 @@ def run_test_in_subprocess(test_case, target_func, inputs=None, timeout=None):
 
     if results["error"] is not None:
         test_case.fail(f'{results["error"]}')
+
+
+"""
+The following contains utils to run the documentation tests without having to overwrite any files.
+
+The `preprocess_string` function adds `# doctest: +IGNORE_RESULT` markers on the fly anywhere a `load_dataset` call is
+made as a print would otherwise fail the corresonding line.
+
+To skip cuda tests, make sure to call `SKIP_CUDA_DOCTEST=1 pytest --doctest-modules <path_to_files_to_test>
+"""
+
+
+def preprocess_string(string, skip_cuda_tests):
+    """Prepare a docstring or a `.mdx` file to be run by doctest.
+
+    The argument `string` would be the whole file content if it is a `.mdx` file. For a python file, it would be one of
+    its docstring. In each case, it may contain multiple python code examples. If `skip_cuda_tests` is `True` and a
+    cuda stuff is detective (with a heuristic), this method will return an empty string so no doctest will be run for
+    `string`.
+    """
+    codeblock_pattern = r"(```(?:python|py)\s*\n\s*>>> )((?:.*?\n)*?.*?```)"
+    codeblocks = re.split(re.compile(codeblock_pattern, flags=re.MULTILINE | re.DOTALL), string)
+    is_cuda_found = False
+    for i, codeblock in enumerate(codeblocks):
+        if "load_dataset(" in codeblock and "# doctest: +IGNORE_RESULT" not in codeblock:
+            codeblocks[i] = re.sub(r"(>>> .*load_dataset\(.*)", r"\1 # doctest: +IGNORE_RESULT", codeblock)
+        if (
+            (">>>" in codeblock or "..." in codeblock)
+            and re.search(r"cuda|to\(0\)|device=0", codeblock)
+            and skip_cuda_tests
+        ):
+            is_cuda_found = True
+            break
+    modified_string = ""
+    if not is_cuda_found:
+        modified_string = "".join(codeblocks)
+    return modified_string
+
+
+class HfDocTestParser(doctest.DocTestParser):
+    """
+    Overwrites the DocTestParser from doctest to properly parse the codeblocks that are formatted with black. This
+    means that there are no extra lines at the end of our snippets. The `# doctest: +IGNORE_RESULT` marker is also
+    added anywhere a `load_dataset` call is made as a print would otherwise fail the corresponding line.
+
+    Tests involving cuda are skipped base on a naive pattern that should be updated if it is not enough.
+    """
+
+    # This regular expression is used to find doctest examples in a
+    # string.  It defines three groups: `source` is the source code
+    # (including leading indentation and prompts); `indent` is the
+    # indentation of the first (PS1) line of the source code; and
+    # `want` is the expected output (including leading indentation).
+    # fmt: off
+    _EXAMPLE_RE = re.compile(r'''
+        # Source consists of a PS1 line followed by zero or more PS2 lines.
+        (?P<source>
+            (?:^(?P<indent> [ ]*) >>>    .*)    # PS1 line
+            (?:\n           [ ]*  \.\.\. .*)*)  # PS2 lines
+        \n?
+        # Want consists of any non-blank lines that do not start with PS1.
+        (?P<want> (?:(?![ ]*$)    # Not a blank line
+             (?![ ]*>>>)          # Not a line starting with PS1
+             # !!!!!!!!!!! HF Specific !!!!!!!!!!!
+             (?:(?!```).)*        # Match any character except '`' until a '```' is found (this is specific to HF because black removes the last line)
+             # !!!!!!!!!!! HF Specific !!!!!!!!!!!
+             (?:\n|$)  # Match a new line or end of string
+          )*)
+        ''', re.MULTILINE | re.VERBOSE
+    )
+    # fmt: on
+
+    # !!!!!!!!!!! HF Specific !!!!!!!!!!!
+    skip_cuda_tests: bool = bool(os.environ.get("SKIP_CUDA_DOCTEST", False))
+    # !!!!!!!!!!! HF Specific !!!!!!!!!!!
+
+    def parse(self, string, name="<string>"):
+        """
+        Overwrites the `parse` method to incorporate a skip for CUDA tests, and remove logs and dataset prints before
+        calling `super().parse`
+        """
+        string = preprocess_string(string, self.skip_cuda_tests)
+        return super().parse(string, name)
+
+
+class HfDoctestModule(Module):
+    """
+    Overwrites the `DoctestModule` of the pytest package to make sure the HFDocTestParser is used when discovering
+    tests.
+    """
+
+    def collect(self) -> Iterable[DoctestItem]:
+        class MockAwareDocTestFinder(doctest.DocTestFinder):
+            """A hackish doctest finder that overrides stdlib internals to fix a stdlib bug.
+
+            https://github.com/pytest-dev/pytest/issues/3456 https://bugs.python.org/issue25532
+            """
+
+            def _find_lineno(self, obj, source_lines):
+                """Doctest code does not take into account `@property`, this
+                is a hackish way to fix it. https://bugs.python.org/issue17446
+
+                Wrapped Doctests will need to be unwrapped so the correct line number is returned. This will be
+                reported upstream. #8796
+                """
+                if isinstance(obj, property):
+                    obj = getattr(obj, "fget", obj)
+
+                if hasattr(obj, "__wrapped__"):
+                    # Get the main obj in case of it being wrapped
+                    obj = inspect.unwrap(obj)
+
+                # Type ignored because this is a private function.
+                return super()._find_lineno(  # type:ignore[misc]
+                    obj,
+                    source_lines,
+                )
+
+            def _find(self, tests, obj, name, module, source_lines, globs, seen) -> None:
+                if _is_mocked(obj):
+                    return
+                with _patch_unwrap_mock_aware():
+                    # Type ignored because this is a private function.
+                    super()._find(  # type:ignore[misc]
+                        tests, obj, name, module, source_lines, globs, seen
+                    )
+
+        if self.path.name == "conftest.py":
+            module = self.config.pluginmanager._importconftest(
+                self.path,
+                self.config.getoption("importmode"),
+                rootpath=self.config.rootpath,
+            )
+        else:
+            try:
+                module = import_path(
+                    self.path,
+                    root=self.config.rootpath,
+                    mode=self.config.getoption("importmode"),
+                )
+            except ImportError:
+                if self.config.getvalue("doctest_ignore_import_errors"):
+                    skip("unable to import module %r" % self.path)
+                else:
+                    raise
+
+        # !!!!!!!!!!! HF Specific !!!!!!!!!!!
+        finder = MockAwareDocTestFinder(parser=HfDocTestParser())
+        # !!!!!!!!!!! HF Specific !!!!!!!!!!!
+        optionflags = get_optionflags(self)
+        runner = _get_runner(
+            verbose=False,
+            optionflags=optionflags,
+            checker=_get_checker(),
+            continue_on_failure=_get_continue_on_failure(self.config),
+        )
+        for test in finder.find(module, module.__name__):
+            if test.examples:  # skip empty doctests and cuda
+                yield DoctestItem.from_parent(self, name=test.name, runner=runner, dtest=test)

utils/prepare_for_doc_test.py

-# coding=utf-8
-# Copyright 2022 The HuggingFace Inc. team.
-#
-# 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.
-""" Style utils to preprocess files for doc tests.
-
-    The doc precossing function can be run on a list of files and/org
-    directories of files. It will recursively check if the files have
-    a python code snippet by looking for a ```python or ```py syntax.
-    In the default mode - `remove_new_line==False` the script will
-    add a new line before every python code ending ``` line to make
-    the docstrings ready for pytest doctests.
-    However, we don't want to have empty lines displayed in the
-    official documentation which is why the new line command can be
-    reversed by adding the flag `--remove_new_line` which sets
-    `remove_new_line==True`.
-
-    When debugging the doc tests locally, please make sure to
-    always run:
-
-    ```python utils/prepare_for_doc_test.py src docs```
-
-    before running the doc tests:
-
-    ```pytest --doctest-modules $(cat utils/documentation_tests.txt) -sv --doctest-continue-on-failure --doctest-glob="*.mdx"```
-
-    Afterwards you should revert the changes by running
-
-    ```python utils/prepare_for_doc_test.py src docs --remove_new_line```
-"""
-
-import argparse
-import os
-
-
-def process_code_block(code, add_new_line=True):
-    if add_new_line:
-        return maybe_append_new_line(code)
-    else:
-        return maybe_remove_new_line(code)
-
-
-def maybe_append_new_line(code):
-    """
-    Append new line if code snippet is a
-    Python code snippet
-    """
-    lines = code.split("\n")
-
-    if lines[0] in ["py", "python"]:
-        # add new line before last line being ```
-        last_line = lines[-1]
-        lines.pop()
-        lines.append("\n" + last_line)
-
-    return "\n".join(lines)
-
-
-def maybe_remove_new_line(code):
-    """
-    Remove new line if code snippet is a
-    Python code snippet
-    """
-    lines = code.split("\n")
-
-    if lines[0] in ["py", "python"]:
-        # add new line before last line being ```
-        lines = lines[:-2] + lines[-1:]
-
-    return "\n".join(lines)
-
-
-def process_doc_file(code_file, add_new_line=True):
-    """
-    Process given file.
-
-    Args:
-        code_file (`str` or `os.PathLike`): The file in which we want to style the docstring.
-    """
-    with open(code_file, "r", encoding="utf-8", newline="\n") as f:
-        code = f.read()
-
-    # fmt: off
-    splits = code.split("```")
-    if len(splits) % 2 != 1:
-        raise ValueError("The number of occurrences of ``` should be an even number.")
-
-    splits = [s if i % 2 == 0 else process_code_block(s, add_new_line=add_new_line) for i, s in enumerate(splits)]
-    clean_code = "```".join(splits)
-    # fmt: on
-
-    diff = clean_code != code
-    if diff:
-        print(f"Overwriting content of {code_file}.")
-        with open(code_file, "w", encoding="utf-8", newline="\n") as f:
-            f.write(clean_code)
-
-
-def process_doc_files(*files, add_new_line=True):
-    """
-    Applies doc styling or checks everything is correct in a list of files.
-
-    Args:
-        files (several `str` or `os.PathLike`): The files to treat.
-            Whether to restyle file or just check if they should be restyled.
-
-    Returns:
-        List[`str`]: The list of files changed or that should be restyled.
-    """
-    for file in files:
-        # Treat folders
-        if os.path.isdir(file):
-            files = [os.path.join(file, f) for f in os.listdir(file)]
-            files = [f for f in files if os.path.isdir(f) or f.endswith(".mdx") or f.endswith(".py")]
-            process_doc_files(*files, add_new_line=add_new_line)
-        else:
-            try:
-                process_doc_file(file, add_new_line=add_new_line)
-            except Exception:
-                print(f"There is a problem in {file}.")
-                raise
-
-
-def main(*files, add_new_line=True):
-    process_doc_files(*files, add_new_line=add_new_line)
-
-
-if __name__ == "__main__":
-    parser = argparse.ArgumentParser()
-    parser.add_argument("files", nargs="+", help="The file(s) or folder(s) to restyle.")
-    parser.add_argument(
-        "--remove_new_line",
-        action="store_true",
-        help="Whether to remove new line after each python code block instead of adding one.",
-    )
-    args = parser.parse_args()
-
-    main(*args.files, add_new_line=not args.remove_new_line)