[misc] refactor launch API and tensor constructor (#5666)

* [misc] remove config arg from initialize

* [misc] remove old tensor contrusctor

* [plugin] add npu support for ddp

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* [devops] fix doc test ci

* [test] fix test launch

* [doc] update launch doc

---------

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

applications/ColossalMoE/train.py

@@ -145,7 +145,7 @@ def main():
     args = parse_args()
 
     # Launch ColossalAI
-    colossalai.launch_from_torch(config={}, seed=args.seed)
+    colossalai.launch_from_torch(seed=args.seed)
     coordinator = DistCoordinator()
 
     # Set plugin
@@ -195,9 +195,9 @@ def main():
     lr_scheduler = CosineAnnealingWarmupLR(
         optimizer=optimizer,
         total_steps=args.num_epochs * len(dataloader),
-        warmup_steps=args.warmup_steps
-        if args.warmup_steps is not None
-        else int(args.num_epochs * len(dataloader) * 0.025),
+        warmup_steps=(
+            args.warmup_steps if args.warmup_steps is not None else int(args.num_epochs * len(dataloader) * 0.025)
+        ),
         eta_min=0.1 * args.lr,
     )