small dataset bug fix #140

train.py

@@ -287,10 +287,10 @@ def train(hyp):
 
             # Plot
             if ni < 3:
-                f = 'train_batch%g.jpg' % i  # filename
+                f = 'train_batch%g.jpg' % ni  # filename
-                res = plot_images(images=imgs, targets=targets, paths=paths, fname=f)
+                result = plot_images(images=imgs, targets=targets, paths=paths, fname=f)
-                if tb_writer:
+                if tb_writer and result is not None:
-                    tb_writer.add_image(f, res, dataformats='HWC', global_step=epoch)
+                    tb_writer.add_image(f, result, dataformats='HWC', global_step=epoch)
                     # tb_writer.add_graph(model, imgs)  # add model to tensorboard
 
             # end batch ------------------------------------------------------------------------------------------------