Add TensorBoard support (#87)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

.github/workflows/ci.yaml

@@ -91,15 +91,15 @@ jobs:
         shell: bash  # for Windows compatibility
         run: |
           yolo task=detect mode=train model=yolov5n.yaml data=coco128.yaml epochs=1 imgsz=64
-          yolo task=detect mode=val model=runs/exp/weights/last.pt imgsz=64
+          yolo task=detect mode=val model=runs/train/exp/weights/last.pt imgsz=64
       - name: Test segmentation
         shell: bash  # for Windows compatibility
         # TODO: redo val test without hardcoded weights
         run: |
           yolo task=segment mode=train model=yolov5n-seg.yaml data=coco128-seg.yaml epochs=1 imgsz=64
-          yolo task=segment mode=val model=runs/exp2/weights/last.pt data=coco128-seg.yaml imgsz=64
+          yolo task=segment mode=val model=runs/train/exp2/weights/last.pt data=coco128-seg.yaml imgsz=64
       - name: Test classification
         shell: bash  # for Windows compatibility
         run: |
           yolo task=classify mode=train model=resnet18 data=mnist160 epochs=1 imgsz=32
-          yolo task=classify mode=val model=runs/exp3/weights/last.pt data=mnist160
+          yolo task=classify mode=val model=runs/train/exp3/weights/last.pt data=mnist160

ultralytics/yolo/engine/trainer.py

@@ -4,7 +4,6 @@ Simple training loop; Boilerplate that could apply to any arbitrary neural netwo
 
 import os
 import subprocess
-import sys
 import time
 from collections import defaultdict
 from copy import deepcopy
@@ -128,6 +127,7 @@ class BaseTrainer:
         Builds dataloaders and optimizer on correct rank process
         """
         # model
+        self.trigger_callbacks("on_pretrain_routine_start")
         ckpt = self.setup_model()
         self.model = self.model.to(self.device)
         self.set_model_attributes()
@@ -159,13 +159,13 @@ class BaseTrainer:
             # metric_keys = self.validator.metric_keys + self.label_loss_items(prefix="val")
             # self.metrics = dict(zip(metric_keys, [0] * len(metric_keys)))  # TODO: init metrics for plot_results()?
             self.ema = ModelEMA(self.model)
+        self.trigger_callbacks("on_pretrain_routine_end")
 
     def _do_train(self, rank=-1, world_size=1):
         if world_size > 1:
             self._setup_ddp(rank, world_size)
 
         self._setup_train(rank, world_size)
-        self.trigger_callbacks("before_train")
 
         self.epoch_time = None
         self.epoch_time_start = time.time()
@@ -173,9 +173,10 @@ class BaseTrainer:
         nb = len(self.train_loader)  # number of batches
         nw = max(round(self.args.warmup_epochs * nb), 100)  # number of warmup iterations
         last_opt_step = -1
+        self.trigger_callbacks("on_train_start")
         for epoch in range(self.start_epoch, self.epochs):
             self.epoch = epoch
-            self.trigger_callbacks("on_epoch_start")
+            self.trigger_callbacks("on_train_epoch_start")
             self.model.train()
             if rank != -1:
                 self.train_loader.sampler.set_epoch(epoch)
@@ -186,7 +187,7 @@ class BaseTrainer:
             self.tloss = None
             self.optimizer.zero_grad()
             for i, batch in pbar:
-                self.trigger_callbacks("on_batch_start")
+                self.trigger_callbacks("on_train_batch_start")
                 # forward
                 batch = self.preprocess_batch(batch)
 
@@ -229,8 +230,11 @@ class BaseTrainer:
                     if self.args.plots and ni < 3:
                         self.plot_training_samples(batch, ni)
 
+                self.trigger_callbacks("on_train_batch_end")
+
             lr = {f"lr{ir}": x['lr'] for ir, x in enumerate(self.optimizer.param_groups)}  # for loggers
             self.scheduler.step()
+            self.trigger_callbacks("on_train_epoch_end")
 
             if rank in [-1, 0]:
                 # validation
@@ -260,9 +264,11 @@ class BaseTrainer:
             if self.args.plots:
                 self.plot_metrics()
             self.log(f"\nTraining complete ({(time.time() - self.train_time_start) / 3600:.3f} hours)")
+            self.log(f"Results saved to {colorstr('bold', self.save_dir)}")
             self.trigger_callbacks('on_train_end')
         dist.destroy_process_group() if world_size > 1 else None
         torch.cuda.empty_cache()
+        self.trigger_callbacks('teardown')
 
     def save_model(self):
         ckpt = {

ultralytics/yolo/utils/callbacks/base.py

@@ -1,13 +1,36 @@
-def before_train(trainer):
-    # Initialize tensorboard logger
+def on_pretrain_routine_start(trainer):
     pass
 
 
-def on_epoch_start(trainer):
+def on_pretrain_routine_end(trainer):
     pass
 
 
-def on_batch_start(trainer):
+def on_train_start(trainer):
+    pass
+
+
+def on_train_epoch_start(trainer):
+    pass
+
+
+def on_train_batch_start(trainer):
+    pass
+
+
+def optimizer_step(trainer):
+    pass
+
+
+def on_before_zero_grad(trainer):
+    pass
+
+
+def on_train_batch_end(trainer):
+    pass
+
+
+def on_train_epoch_end(trainer):
     pass
 
 
@@ -15,27 +38,68 @@ def on_val_start(trainer):
     pass
 
 
+def on_val_batch_start(trainer):
+    pass
+
+
+def on_val_image_end(trainer):
+    pass
+
+
+def on_val_batch_end(trainer):
+    pass
+
+
 def on_val_end(trainer):
     pass
 
 
+def on_fit_epoch_end(trainer):
+    pass
+
+
 def on_model_save(trainer):
     pass
 
 
+def on_train_end(trainer):
+    pass
+
+
+def on_params_update(trainer):
+    pass
+
+
+def teardown(trainer):
+    pass
+
+
 default_callbacks = {
-    "before_train": before_train,
-    "on_epoch_start": on_epoch_start,
-    "on_batch_start": on_batch_start,
-    "on_val_start": on_val_start,
-    "on_val_end": on_val_end,
-    "on_model_save": on_model_save}
+    'on_pretrain_routine_start': on_pretrain_routine_start,
+    'on_pretrain_routine_end': on_pretrain_routine_end,
+    'on_train_start': on_train_start,
+    'on_train_epoch_start': on_train_epoch_start,
+    'on_train_batch_start': on_train_batch_start,
+    'optimizer_step': optimizer_step,
+    'on_before_zero_grad': on_before_zero_grad,
+    'on_train_batch_end': on_train_batch_end,
+    'on_train_epoch_end': on_train_epoch_end,
+    'on_val_start': on_val_start,
+    'on_val_batch_start': on_val_batch_start,
+    'on_val_image_end': on_val_image_end,
+    'on_val_batch_end': on_val_batch_end,
+    'on_val_end': on_val_end,
+    'on_fit_epoch_end': on_fit_epoch_end,  # fit = train + val
+    'on_model_save': on_model_save,
+    'on_train_end': on_train_end,
+    'on_params_update': on_params_update,
+    'teardown': teardown}
 
 
 def add_integration_callbacks(trainer):
-    callbacks = {}
+    from .clearml import callbacks as clearml_callbacks
+    from .tb import callbacks as tb_callbacks
 
-    from .clearml import callbacks, clearml
-    if clearml:
-        for callback, func in callbacks.items():
-            trainer.add_callback(callback, func)
+    for x in tb_callbacks, clearml_callbacks:
+        for k, v in x.items():
+            trainer.add_callback(k, v)  # add_callback(name, func)

ultralytics/yolo/utils/callbacks/clearml.py

@@ -9,47 +9,33 @@ except (ImportError, AssertionError):
     clearml = None
 
 
-def _log_scalers(metric_dict, group="", step=0):
-    task = Task.current_task()
-    if task:
-        for k, v in metric_dict.items():
-            task.get_logger().report_scalar(group, k, v, step)
-
-
-def before_train(trainer):
+def on_train_start(trainer):
     # TODO: reuse existing task
-    task = Task.init(project_name=trainer.args.project if trainer.args.project != 'runs/train' else 'YOLOv5',
-                     task_name=trainer.args.name if trainer.args.name != 'exp' else 'Training',
-                     tags=['YOLOv5'],
+    task = Task.init(project_name=trainer.args.project if trainer.args.project != 'runs/train' else 'YOLOv8',
+                     task_name=trainer.args.name,
+                     tags=['YOLOv8'],
                      output_uri=True,
                      reuse_last_task_id=False,
                      auto_connect_frameworks={'pytorch': False})
     task.connect(dict(trainer.args), name='General')
 
 
-def on_batch_end(trainer):
-    _log_scalers(trainer.label_loss_items(trainer.tloss, prefix="train"), "train", trainer.epoch)
-
-
 def on_val_end(trainer):
-    _log_scalers(trainer.label_loss_items(trainer.validator.loss, prefix="val"), "val", trainer.epoch)
-    _log_scalers({k: v for k, v in trainer.metrics.items() if k.startswith("metrics")}, "metrics", trainer.epoch)
     if trainer.epoch == 0:
         model_info = {
-            "inference_speed": trainer.validator.speed[1],
-            "flops@640": get_flops(trainer.model),
-            "params": get_num_params(trainer.model)}
-        Task.current_task().connect(model_info, 'Model')
+            "Inference speed (ms/img)": round(trainer.validator.speed[1], 1),
+            "GFLOPs": round(get_flops(trainer.model), 1),
+            "Parameters": get_num_params(trainer.model)}
+        Task.current_task().connect(model_info, name='Model')
 
 
 def on_train_end(trainer):
-    task = Task.current_task()
-    if task:
-        task.update_output_model(model_path=str(trainer.best), model_name='Best Model', auto_delete_file=False)
+    Task.current_task().update_output_model(model_path=str(trainer.best),
+                                            model_name=trainer.args.name,
+                                            auto_delete_file=False)
 
 
 callbacks = {
-    "before_train": before_train,
+    "on_train_start": on_train_start,
     "on_val_end": on_val_end,
-    "on_batch_end": on_batch_end,
-    "on_train_end": on_train_end}
+    "on_train_end": on_train_end} if clearml else {}

ultralytics/yolo/utils/callbacks/tb.py

@@ -0,0 +1,26 @@
+from torch.utils.tensorboard import SummaryWriter
+
+writer = None  # TensorBoard SummaryWriter instance
+
+
+def _log_scalars(scalars, step=0):
+    for k, v in scalars.items():
+        writer.add_scalar(k, v, step)
+
+
+def on_train_start(trainer):
+    global writer
+    writer = SummaryWriter(str(trainer.save_dir))
+    trainer.console.info(f"Logging results to {trainer.save_dir}\n"
+                         f"Starting training for {trainer.args.epochs} epochs...")
+
+
+def on_batch_end(trainer):
+    _log_scalars(trainer.label_loss_items(trainer.tloss, prefix="train"), trainer.epoch)
+
+
+def on_val_end(trainer):
+    _log_scalars(trainer.metrics, trainer.epoch)
+
+
+callbacks = {"on_train_start": on_train_start, "on_val_end": on_val_end, "on_batch_end": on_batch_end}

ultralytics/yolo/utils/configs/default.yaml

@@ -15,7 +15,7 @@ nosave: False
 cache: False  # True/ram, disk or False
 device: ''  # cuda device, i.e. 0 or 0,1,2,3 or cpu
 workers: 8
-project: 'runs'
+project: 'runs/train'
 name: 'exp'
 exist_ok: False
 pretrained: False