Update requirements.txt, doc/implemented.rst files

Deleted doc/img/tensorflow_pipe.png

doc/implemented.rst

@@ -58,11 +58,6 @@ Image Feature Extractors
    bob.bio.face.extractor.DCTBlocks
    bob.bio.face.extractor.GridGraph
    bob.bio.face.extractor.LGBPHS
-   bob.bio.face.extractor.MxNetModel
-   bob.bio.face.extractor.PyTorchLoadedModel
-   bob.bio.face.extractor.PyTorchLibraryModel
-   bob.bio.face.extractor.TensorFlowModel
-   bob.bio.face.extractor.OpenCVModel
 
 
 Face Recognition Algorithms

requirements.txt

@@ -18,8 +18,6 @@ bob.bio.base
 bob.ip.facedetect
 bob.pipelines
 matplotlib   # for plotting
-mxnet
-opencv-python
 six
 scikit-image
 scikit-learn # for pipelines Tranformers