forward_all() not working in python 3

[enedene]

I have a caffe with python 3 interface installed. When trying to use:

solver.net.forward_all() I get the following error:

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-341-419dfac25475> in <module>()
----> 1 solver.net.forward_all()

/root/caffe/python/caffe/pycaffe.py in _Net_forward_all(self, blobs, **kwargs)
    173     # Collect outputs from batches
    174     all_outs = {out: [] for out in set(self.outputs + (blobs or []))}
--> 175     for batch in self._batch(kwargs):
    176         outs = self.forward(blobs=blobs, **batch)
    177         for out, out_blob in outs.iteritems():

/root/caffe/python/caffe/pycaffe.py in _Net_batch(self, blobs)
    257     batch: {blob name: list of blobs} dict for a single batch.
    258     """
--> 259     num = len(blobs.itervalues().next())
    260     batch_size = self.blobs.itervalues().next().num
    261     remainder = num % batch_size

AttributeError: 'dict' object has no attribute 'itervalues'

values() dict method should be used for python 3 instead. It's possible that this is not the only place where this error occurs.

[seanbell]

I suppose the fix is to use six to abstract away the 2vs3 issues, in cases like this.

[kruupos]

This is already have been taken care of #3716