Update tensorboard>=2.4.1 (ultralytics#2576)

* Update tensorboard>=2.4.1 

Update tensorboard version to attempt to address ultralytics#2573 (tensorboard logging fail in Docker image).

* cleanup

(cherry picked from commit e5b0200)

requirements.txt

@@ -8,12 +8,12 @@ opencv-python>=4.1.2
 Pillow
 PyYAML>=5.3.1
 scipy>=1.4.1
-tensorboard>=2.2
 torch>=1.7.0
 torchvision>=0.8.1
 tqdm>=4.41.0
 
 # logging -------------------------------------
+tensorboard>=2.4.1
 # wandb
 
 # plotting ------------------------------------

train.py

@@ -1,4 +1,3 @@
-
 import argparse
 import logging
 import math
@@ -34,7 +33,7 @@
 from utils.loss import ComputeLoss
 from utils.plots import plot_images, plot_labels, plot_results, plot_evolution
 from utils.torch_utils import ModelEMA, select_device, intersect_dicts, torch_distributed_zero_first, is_parallel
-from utils.wandb_logging.wandb_utils import WandbLogger, resume_and_get_id, check_wandb_config_file
+from utils.wandb_logging.wandb_utils import WandbLogger, resume_and_get_id
 
 
 
@@ -602,7 +601,8 @@ def train_ray_tune(config):
     if not opt.evolve:
         tb_writer = None  # init loggers
         if opt.global_rank in [-1, 0]:
-            logger.info(f'Start Tensorboard with "tensorboard --logdir {opt.project}", view at http://localhost:6006/')
+            prefix = colorstr('tensorboard: ')
+            logger.info(f"{prefix}Start with 'tensorboard --logdir {opt.project}', view at http://localhost:6006/")
             tb_writer = SummaryWriter(opt.save_dir)  # Tensorboard