solve Path error on Windows (#1627)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit


- **Chores**
- Improved code readability and maintainability through cleanup and
simplification of functions.
	- Streamlined file path construction using the modern `Path` API.
- Removed unnecessary operations related to file handling and training
resources.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Signed-off-by: C. Thang Nguyen <[email protected]>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

dpgen/generator/run.py

@@ -272,8 +272,7 @@ def make_train_dp(iter_index, jdata, mdata):
     # train_param = jdata['train_param']
     train_input_file = default_train_input_file
     numb_models = jdata["numb_models"]
-    init_data_prefix = jdata["init_data_prefix"]
-    init_data_prefix = os.path.abspath(init_data_prefix)
+    init_data_prefix = os.path.abspath(jdata["init_data_prefix"])
     init_data_sys_ = jdata["init_data_sys"]
     fp_task_min = jdata["fp_task_min"]
     model_devi_jobs = jdata["model_devi_jobs"]
@@ -390,14 +389,17 @@ def make_train_dp(iter_index, jdata, mdata):
         sys_paths = expand_sys_str(os.path.join(init_data_prefix, ii))
         for single_sys in sys_paths:
             init_data_sys.append(
-                os.path.normpath(
-                    os.path.join(
-                        "..",
-                        "data.init",
-                        ii,
-                        os.path.relpath(single_sys, os.path.join(init_data_prefix, ii)),
+                Path(
+                    os.path.normpath(
+                        os.path.join(
+                            "../data.init",
+                            ii,
+                            os.path.relpath(
+                                single_sys, os.path.join(init_data_prefix, ii)
+                            ),
+                        )
                     )
-                )
+                ).as_posix()
             )
             init_batch_size.append(detect_batch_size(ss, single_sys))
             if auto_ratio:
@@ -435,7 +437,9 @@ def make_train_dp(iter_index, jdata, mdata):
                     continue
                 for sys_single in sys_paths:
                     init_data_sys.append(
-                        os.path.normpath(os.path.join("..", "data.iters", sys_single))
+                        Path(
+                            os.path.normpath(os.path.join("../data.iters", sys_single))
+                        ).as_posix()
                     )
                     batch_size = (
                         sys_batch_size[sys_idx]
@@ -763,8 +767,6 @@ def run_train_dp(iter_index, jdata, mdata):
     if suffix == ".pth":
         train_command += " --pt"
 
-    train_resources = mdata["train_resources"]
-
     # paths
     iter_name = make_iter_name(iter_index)
     work_path = os.path.join(iter_name, train_name)
@@ -1558,7 +1560,7 @@ def _make_model_devi_native(iter_index, jdata, mdata, conf_systems):
     models = sorted(glob.glob(os.path.join(train_path, f"graph*{suffix}")))
     task_model_list = []
     for ii in models:
-        task_model_list.append(os.path.join("..", os.path.basename(ii)))
+        task_model_list.append(Path(f"../{Path(ii).name}").as_posix())
     work_path = os.path.join(iter_name, model_devi_name)
 
     sys_counter = 0