plugin support trainer

Link: https://code.alibaba-inc.com/Ali-MaaS/MaaS-lib/codereview/12311477
* add plugin import before build trainer

modelscope/trainers/builder.py

@@ -1,7 +1,12 @@
 # Copyright (c) Alibaba, Inc. and its affiliates.
 from modelscope.metainfo import Trainers
-from modelscope.utils.config import ConfigDict
-from modelscope.utils.constant import Tasks
+from modelscope.pipelines.builder import normalize_model_input
+from modelscope.pipelines.util import is_official_hub_path
+from modelscope.utils.config import check_config
+from modelscope.utils.constant import DEFAULT_MODEL_REVISION
+from modelscope.utils.hub import read_config
+from modelscope.utils.plugins import (register_modelhub_repo,
+                                      register_plugins_repo)
 from modelscope.utils.registry import Registry, build_from_cfg
 
 TRAINERS = Registry('trainers')
@@ -16,4 +21,19 @@ def build_trainer(name: str = Trainers.default, default_args: dict = None):
         default_args (dict, optional): Default initialization arguments.
     """
     cfg = dict(type=name)
+    model = default_args.get('model', None)
+    model_revision = default_args.get('model_revision', DEFAULT_MODEL_REVISION)
+
+    if isinstance(model, str) \
+            or (isinstance(model, list) and isinstance(model[0], str)):
+        if is_official_hub_path(model, revision=model_revision):
+            # read config file from hub and parse
+            configuration = read_config(
+                model, revision=model_revision) if isinstance(
+                    model, str) else read_config(
+                        model[0], revision=model_revision)
+            model_dir = normalize_model_input(model, model_revision)
+            register_plugins_repo(configuration.safe_get('plugins'))
+            register_modelhub_repo(model_dir,
+                                   configuration.get('allow_remote', False))
     return build_from_cfg(cfg, TRAINERS, default_args=default_args)