          image_files = self._get_images(self._pathpreview)
          modified = None
          if not image_files:
              logger.debug("No preview to display")
              self._previewtrain = dict()
              return
          for img in image_files:
              modified = os.path.getmtime(img) if modified is None else modified
              name = os.path.basename(img)
              name = os.path.splitext(name)[0]
 
</s> remove         retval = dict()
 </s> add         retval = {} </s> remove         self._previewtrain = dict()
 </s> add         self._previewtrain = {} </s> remove         self._previewtrain = dict()
 </s> add         self._previewtrain = {} </s> remove             if name not in existing.keys():
 </s> add             if name not in existing: </s> remove                                   filenames=list(),
 </s> add                                   filenames=[],
            self._previewtrain = {}
          image_files = self._get_images(self._pathpreview)
          modified = None
          if not image_files:
              logger.debug("No preview to display")
            self._previewtrain = {}
              return
          for img in image_files:
              modified = os.path.getmtime(img) if modified is None else modified
              name = os.path.basename(img)
              name = os.path.splitext(name)[0]
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