gnu: python-keras: Add upstream patch.

* gnu/packages/patches/python-keras-integration-test.patch: New file.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.
* gnu/packages/machine-learning.scm (python-keras)[source](patches): New field.

gnu/local.mk

@@ -1225,6 +1225,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/python2-larch-coverage-4.0a6-compatibility.patch \
   %D%/packages/patches/python-configobj-setuptools.patch	\
   %D%/packages/patches/python-faker-fix-build-32bit.patch	\
+  %D%/packages/patches/python-keras-integration-test.patch	\
   %D%/packages/patches/python-pyfakefs-remove-bad-test.patch	\
   %D%/packages/patches/python-flint-includes.patch		\
   %D%/packages/patches/python-mox3-python3.6-compat.patch	\

gnu/packages/machine-learning.scm

@@ -1853,6 +1853,7 @@ with image data, text data, and sequence data.")
      (origin
        (method url-fetch)
        (uri (pypi-uri "Keras" version))
+       (patches (search-patches "python-keras-integration-test.patch"))
        (sha256
         (base32
          "1j8bsqzh49vjdxy6l1k4iwax5vpjzniynyd041xjavdzvfii1dlh"))))

gnu/packages/patches/python-keras-integration-test.patch

@@ -0,0 +1,19 @@
+Fix a test failure with recent versions of ... Pytest?  Python?
+
+Taken from upstream:
+https://github.com/keras-team/keras/commit/fe35050a8f18dc52304aa8da4e463eececa25240
+
+diff --git a/tests/integration_tests/applications_test.py b/tests/integration_tests/applications_test.py
+index 979f2f2abd6..6e3b57fa8e2 100644
+--- a/tests/integration_tests/applications_test.py
++++ b/tests/integration_tests/applications_test.py
+@@ -58,7 +58,8 @@ def _test_application_basic(app, last_dim=1000):
+ def _test_application_notop(app, last_dim):
+     output_shape = _get_output_shape(
+         lambda: app(weights=None, include_top=False))
+-    assert output_shape == (None, None, None, last_dim)
++    assert len(output_shape) == 4
++    assert output_shape[-1] == last_dim
+ 
+ 
+ def test_mobilenet_v2_legacy_import():