Traceback (most recent call last):


 "portrait_seg.py", line 206, in <module>

layers='4+')


 "/home/xxx/Desktop/keras_Mask_RCNN/model.py", line 2211, in train

use_multiprocessing=True,


 "/home/xxx/anaconda2/envs/py36/lib/python3.6/site-packages/keras/legacy/interfaces.py", line 87, in wrapper

return func(*args, **kwargs)


 "/home/xxx/anaconda2/envs/py36/lib/python3.6/site-packages/keras/engine/training.py", line 2096, in fit_generator

class_weight=class_weight)


 "/home/xxx/anaconda2/envs/py36/lib/python3.6/site-packages/keras/engine/training.py", line 1814, in train_on_batch

outputs = self.train_function(ins)


 "/home/xxx/anaconda2/envs/py36/lib/python3.6/site-packages/keras/backend/tensorflow_backend.py", line 2352, in __call__

**self.session_kwargs)


 "/home/xxx/anaconda2/envs/py36/lib/python3.6/site-packages/tensorflow/python/client/session.py", line 889, in run

run_metadata_ptr)


 "/home/xxx/anaconda2/envs/py36/lib/python3.6/site-packages/tensorflow/python/client/session.py", line 1120, in _run

feed_dict_tensor, options, run_metadata)


 "/home/xxx/anaconda2/envs/py36/lib/python3.6/site-packages/tensorflow/python/client/session.py", line 1317, in _do_run

options, run_metadata)


 "/home/xxx/anaconda2/envs/py36/lib/python3.6/site-packages/tensorflow/python/client/session.py", line 1336, in _do_call

raise type(e)(node_def, op, message)
tensorflow.python.framework.errors_impl.InvalidArgumentError: Reduction axis 1 is empty in shape [0,0]

Traceback (most recent call last):

 "/home/pombreda/w421/conan/local/lib/python2.7/site-packages/pip/basecommand.py", line 215, in main
status = self.run(options, args)

 "/home/pombreda/w421/conan/local/lib/python2.7/site-packages/pip/commands/install.py", line 310, in run
wb.build(autobuilding=True)

 "/home/pombreda/w421/conan/local/lib/python2.7/site-packages/pip/wheel.py", line 750, in build
self.requirement_set.prepare_files(self.finder)

 "/home/pombreda/w421/conan/local/lib/python2.7/site-packages/pip/req/req_set.py", line 370, in prepare_files
ignore_dependencies=self.ignore_dependencies))

 "/home/pombreda/w421/conan/local/lib/python2.7/site-packages/pip/req/req_set.py", line 669, in _prepare_file
add_req(subreq)

 "/home/pombreda/w421/conan/local/lib/python2.7/site-packages/pip/req/req_set.py", line 639, in add_req
wheel_cache=self._wheel_cache,

 "/home/pombreda/w421/conan/local/lib/python2.7/site-packages/pip/req/req_install.py", line 87, in __init__
"Invalid requirement: '%s'\n%s" % (req, add_msg))InstallationError: Invalid requirement: 'lxml==3.6.4; linux in "sys_platform"'