Remove setting of matplotlib backend

bilby/core/utils.py

@@ -971,29 +971,6 @@ command_line_args, command_line_parser = set_up_command_line_arguments()
 #  Instantiate the default logging
 setup_logger(print_version=False, log_level=command_line_args.log_level)
 
-if 'DISPLAY' in os.environ:
-    logger.debug("DISPLAY={} environment found".format(os.environ['DISPLAY']))
-    pass
-else:
-    logger.debug('No $DISPLAY environment variable found, so importing \
-                   matplotlib.pyplot with non-interactive "Agg" backend.')
-    import matplotlib
-    import matplotlib.pyplot as plt
-
-    non_gui_backends = matplotlib.rcsetup.non_interactive_bk
-    for backend in non_gui_backends:
-        try:
-            logger.debug("Trying backend {}".format(backend))
-            if StrictVersion(matplotlib.__version__) >= StrictVersion("3.1"):
-                matplotlib.use(backend)
-            else:
-                matplotlib.use(backend, warn=False)
-            plt.switch_backend(backend)
-            break
-        except Exception:
-            print(traceback.format_exc())
-
-
 class BilbyJsonEncoder(json.JSONEncoder):
 
     def default(self, obj):