example workflow code for model implementation (#17)

* upload example code for model implementation

* Refactor Model Implement

* add export

---------

Co-authored-by: Young <afe.young@gmail.com>

rdagent/utils/__init__.py

@@ -0,0 +1,36 @@
+"""
+This is some common utils functions.
+it is not binding to the scenarios or framework (So it is not placed in rdagent.core.utils)
+"""
+# TODO: merge the common utils in `rdagent.core.utils` into this folder
+# TODO: split the utils in this module into different modules in the future.
+
+import importlib
+import re
+import sys
+from types import ModuleType
+from typing import Union
+
+
+def get_module_by_module_path(module_path: Union[str, ModuleType]):
+    """Load module from path like a/b/c/d.py or a.b.c.d
+
+    :param module_path:
+    :return:
+    :raises: ModuleNotFoundError
+    """
+    if module_path is None:
+        raise ModuleNotFoundError("None is passed in as parameters as module_path")
+
+    if isinstance(module_path, ModuleType):
+        module = module_path
+    else:
+        if module_path.endswith(".py"):
+            module_name = re.sub("^[^a-zA-Z_]+", "", re.sub("[^0-9a-zA-Z_]", "", module_path[:-3].replace("/", "_")))
+            module_spec = importlib.util.spec_from_file_location(module_name, module_path)
+            module = importlib.util.module_from_spec(module_spec)
+            sys.modules[module_name] = module
+            module_spec.loader.exec_module(module)
+        else:
+            module = importlib.import_module(module_path)
+    return module