Make requirements-ac-test.txt work on Windows (openvinotoolkit#913)

Author: Roman Donchenko

ci/requirements-ac-test.txt

@@ -1,15 +1,10 @@
-#
-# This file is autogenerated by pip-compile
-# To update, run:
-#
-#    pip-compile --output-file=ci/requirements-ac-test.txt tools/accuracy_checker/requirements-test.in tools/accuracy_checker/requirements.in
-#
+atomicwrites==1.3.0
 attrs==19.3.0             # via pytest
 importlib-metadata==1.5.0  # via pluggy, pytest
 joblib==0.14.1            # via scikit-learn
 more-itertools==8.2.0     # via pytest
 nibabel==3.0.1
-numpy==1.17.5
+numpy==1.17.5             # via nibabel, scikit-learn, scipy
 packaging==20.1           # via pytest
 pathlib2==2.3.5           # via pytest
 pillow==7.0.0
@@ -19,7 +14,7 @@ py==1.8.1                 # via pytest
 pyparsing==2.4.6          # via packaging
 pytest-mock==2.0.0
 pytest==5.3.5
-pyyaml==5.3
+pyyaml==5.3               # via yamlloader
 scikit-learn==0.22.1
 scipy==1.4.1
 sentencepiece==0.1.85

ci/requirements-ac.txt

@@ -1,15 +1,9 @@
-#
-# This file is autogenerated by pip-compile
-# To update, run:
-#
-#    pip-compile --output-file=ci/requirements-ac.txt tools/accuracy_checker/requirements.in
-#
 joblib==0.14.1            # via scikit-learn
 nibabel==3.0.1
-numpy==1.17.5
+numpy==1.17.5             # via nibabel, scikit-learn, scipy
 pillow==7.0.0
 py-cpuinfo==4.0.0
-pyyaml==5.3
+pyyaml==5.3               # via yamlloader
 scikit-learn==0.22.1
 scipy==1.4.1
 sentencepiece==0.1.85

tools/accuracy_checker/requirements-test.in

@@ -1,2 +1,10 @@
 pytest~=5.0
 pytest-mock~=2.0
+
+# pytest depends on atomicwrites, but only on Windows.
+# This means that if we use pip-compile on Linux, the resulting requirements.txt
+# will not include atomicwrites and thus will not work on Windows.
+# And we _can't_ use pip-compile on Windows, because sentencepiece does not have
+# Python 3.5 Windows wheels on PyPI.
+# So as a workaround, make the atomicwrites dependency unconditional.
+atomicwrites