[py][fix] FaceCrop needs to be a functools

Accepting a functools as face_cropper argument of preprocessor in utils
Adding the processing of functools in INormLBP
Fix of a type issue in GridGraph extractor (numpy uint16 instead of float)

bob/bio/face/extractor/GridGraph.py

@@ -184,8 +184,10 @@ class GridGraph (Extractor):
       The list of Gabor jets extracted from the image.
       The 2D location of the jet's nodes is not returned.
     """
+
     assert image.ndim == 2
     assert isinstance(image, numpy.ndarray)
+    image = image.astype(numpy.float64)
     assert image.dtype == numpy.float64
 
     extractor = self._extractor(image)

bob/bio/face/preprocessor/INormLBP.py

@@ -112,8 +112,16 @@ class INormLBP (Base):
     face : 2D :py:class:`numpy.ndarray`
       The cropped and photometrically enhanced face.
     """
+
     image = self.color_channel(image)
     if self.cropper is not None:
+
+      # TODO: IN DASK, SELF.CROPPER IS A FUNCTOOLS
+      # WE NEED TO THINK HOW TO PROPERLY APPROACH THIS ISSUE
+      
+      if not isinstance(self.cropper, bob.bio.face.preprocessor.FaceCrop):
+          self.cropper = self.cropper()
+
       image = self.cropper.crop_face(image, annotations)
     image = self.lbp_extractor(image)
     return self.data_type(image)

bob/bio/face/preprocessor/utils.py

 import bob.bio.base
 import six
 
+import functools
+
 
 def load_cropper(face_cropper):
   from .FaceCrop import FaceCrop
@@ -9,12 +11,13 @@ def load_cropper(face_cropper):
     cropper = None
   elif isinstance(face_cropper, six.string_types):
     cropper = bob.bio.base.load_resource(face_cropper, 'preprocessor')
-  elif isinstance(face_cropper, (FaceCrop, FaceDetect)):
+  # In Dask, face_cropper is a functools. TODO: check that the object inside functool is valid
+  elif isinstance(face_cropper, (FaceCrop, FaceDetect, functools.partial)):
     cropper = face_cropper
   else:
     raise ValueError("The given face cropper type is not understood")
 
-  assert cropper is None or isinstance(cropper,  (FaceCrop, FaceDetect))
+  assert cropper is None or isinstance(cropper,  (FaceCrop, FaceDetect)) or isinstance(cropper, functools.partial)
   return cropper