          """ Clear all cached images. """
          logger.debug("Clearing image cache")
          self._pathoutput = None
          self._previewoutput = None
          self._previewtrain = dict()
          self._previewcache = dict(modified=None,  # cache for extract and convert
                                    images=None,
                                    filenames=list(),
                                    placeholder=None)
  
 
</s> remove         self._previewtrain = dict()
 </s> add         self._previewtrain = {} </s> remove                                   filenames=list(),
 </s> add                                   filenames=[], </s> remove                                   filenames=list(),
 </s> add                                   filenames=[], </s> remove         self._state = dict()
 </s> add         self._state = {} </s> remove             self._previewtrain = dict()
 </s> add             self._previewtrain = {}
        self._previewtrain = {}
          """ Clear all cached images. """
          logger.debug("Clearing image cache")
          self._pathoutput = None
          self._previewoutput = None
        self._previewtrain = {}
          self._previewcache = dict(modified=None,  # cache for extract and convert
                                    images=None,
                                    filenames=list(),
                                    placeholder=None)
  
keep keep keep keep replace keep keep keep keep keep
 Update code to support Tensorflow versions up to 2.8 (#1213)

* Update maximum tf version in setup + requirements

* - bump max version of tf version in launcher
- standardise tf version check

* update keras get_custom_objects  for tf>2.6

* bugfix: force black text in GUI file dialogs (linux)

* dssim loss - Move to stock tf.ssim function

* Update optimizer imports for compatibility

* fix logging for tf2.8

* Fix GUI graphing for TF2.8

* update tests

* bump requirements.txt versions

* Remove limit on nvidia-ml-py

* Graphing bugfixes
  - Prevent live graph from displaying if data not yet available

* bugfix: Live graph. Collect loss labels correctly

* fix: live graph - swallow inconsistent loss errors

* Bugfix: Prevent live graph from clearing during training

* Fix graphing for AMD 
lib/gui/utils.py