CI buils with minimal and latest requirements (#500)

* install nim req.

* update requirements

* drop Cython

.travis.yml

@@ -16,9 +16,16 @@ language: python
 
 matrix:
   include:
-#    - dist: xenial  # Ubuntu 16.04
-#      python: 3.5
-#      env: TOXENV=py35
+    - dist: xenial  # Ubuntu 16.04
+      python: 3.6
+      env:
+        - TOXENV=py36
+        - MIN_REQUIREMENTS=1
+    - dist: xenial  # Ubuntu 16.04
+      python: 3.7
+      env:
+        - TOXENV=py37
+        - MIN_REQUIREMENTS=1
     - dist: bionic  # Ubuntu 18.04
       python: 3.6
       env: TOXENV=py36
@@ -51,6 +58,15 @@ install:
   - pip install future  # needed for `builtins`
   - sudo pip install tox
 
+before_script:
+  # rewrite all minimal requirements as strict
+  - if [[ "${MIN_REQUIREMENTS}" == "1" ]]; then
+      python -c "req = open('requirements.txt').read().replace('>', '=') ; open('requirements-ci.txt', 'w').write(req)" ;
+    else
+      cp requirements.txt requirements-ci.txt ;
+    fi
+  - pip install -r requirements-ci.txt -U
+
 script:
   # integration
   - tox --sitepackages

requirements.txt

@@ -1,8 +1,8 @@
-scikit-learn==0.20.2
-tqdm==4.35.0
-numpy==1.16.4
+scikit-learn>=0.20.2
+tqdm>=4.35.0
+numpy>=1.16.4
 torch>=1.1
 torchvision>=0.3.0
-pandas>=0.20.3
+pandas>=0.24  # lower version do not support py3.7
 test-tube>=0.6.9
-# future>=0.17.1  # required for buildins in setup.py
+# future>=0.17.1  # required for buildins in setup.py

setup.cfg

@@ -52,14 +52,15 @@ omit =
 [flake8]
 # TODO: this should be 88 or 100 according PEP8
 max-line-length = 120
-exclude = .tox,*.egg,build,temp,examples/*
+exclude = .tox,*.egg,build,temp
 select = E,W,F
 doctests = True
 verbose = 2
 # https://pep8.readthedocs.io/en/latest/intro.html#error-codes
 format = pylint
 ignore = E731,W504,F401,F841
 
+# setup.cfg or tox.ini
 [check-manifest]
 ignore =
     .travis.yml

tox.ini

@@ -31,11 +31,11 @@ basepython =
     py37: python3.7
     py38: python3.8
 deps =
-    -r requirements.txt
+    -r requirements-ci.txt
     -r ./tests/requirements.txt
 commands =
     pip list
-    check-manifest
+    check-manifest --ignore requirements-ci.txt
     python setup.py check --metadata --strict
     coverage run --source pytorch_lightning -m py.test pytorch_lightning tests pl_examples -v --doctest-modules
     flake8 .