Merge branch 'relax_matplotlib_dependency' into 'master'

Relax matplotlib requirement

Closes #31

See merge request !39

bob/io/image/utils.py

 import numpy as np
-import matplotlib.pyplot as plt
 
 
 def to_matplotlib(img):
@@ -64,6 +63,7 @@ def imshow(img, cmap=None, **kwargs):
     object
         Returns whatever ``plt.imshow`` returns.
     '''
+    import matplotlib.pyplot as plt
 
     if cmap is None and img.ndim == 2:
         cmap = 'gray'

conda/meta.yaml

@@ -40,9 +40,10 @@ requirements:
   run:
     - python
     - setuptools
-    - matplotlib
     - boost
     - {{ pin_compatible('numpy') }}
+  run_constrained:
+    - matplotlib
 
 test:
   imports:
@@ -59,6 +60,7 @@ test:
     - coverage
     - sphinx
     - sphinx_rtd_theme
+    - matplotlib
 
 about:
   home: https://www.idiap.ch/software/bob/

doc/extra-intersphinx.txt

+matplotlib

requirements.txt

@@ -4,4 +4,3 @@ bob.extension
 bob.blitz
 bob.core
 bob.io.base
-matplotlib

test-requirements.txt

+matplotlib