fix DFLJPG,

SAE: added "rare sample booster"
SAE: pixel loss replaced to smooth transition from DSSIM to PixelLoss in 15k epochs by default

models/Model_DF/Model.py

@@ -55,7 +55,7 @@ class Model(ModelBase):
                                 [self.decoder_dst, self.get_strpath_storage_for_file(self.decoder_dstH5)]] )
         
     #override
-    def onTrainOneEpoch(self, sample):
+    def onTrainOneEpoch(self, sample, generators_list):
         warped_src, target_src, target_src_mask = sample[0]
         warped_dst, target_dst, target_dst_mask = sample[1]