diff --git a/README.md b/README.md
index f6fed90..087fd3b 100644
--- a/README.md
+++ b/README.md
@@ -37,6 +37,7 @@ ONNX → BIE → NEF。系統以 Scheduler 為控制面，搭配 Worker Pool 與
 ## 備註
 - docs/Design.md 為唯一真實設計文件。
 - apps/ 與 infra 為實作中的目錄，後續可能變動。
+- ktc 有本地 patch 紀錄，見 docs/KTC_PATCHES.md（若 ktc 更新需重新套用並測試）。
 
 ## 目錄結構（概要）
 ```
diff --git a/docs/Design.md b/docs/Design.md
index 23ef914..274bd67 100644
--- a/docs/Design.md
+++ b/docs/Design.md
@@ -144,6 +144,44 @@ error:
 
 ---
 
+## 4.1 工作目錄與 Worker I/O 規格（落地版）
+
+以下為實作落地時的檔案布局與 worker 互動規格（與 MinIO 路徑可一對一對應）：
+
+### 4.1.1 工作目錄
+- API 取號後建立 `task_id`
+- API 將使用者上傳檔案放入工作目錄：
+  - `{base_path}/{task_id}/`
+  - 參考圖片固定放在 `ref_images/`
+
+```
+{base_path}/{task_id}/
+  <single_input_file>   # 唯一輸入檔（副檔名不固定）
+  ref_images/
+    <image files...>
+```
+
+### 4.1.2 ONNX Worker
+- 輸入：工作目錄下的唯一檔案（不假設檔名 / 副檔名）
+- 輸出：`out.onnx`
+- 輸出位置：同一工作目錄
+
+### 4.1.3 BIE Worker
+- 輸入：`out.onnx` + `ref_images/*`
+- 輸出：`out.bie`
+- 輸出位置：同一工作目錄
+
+### 4.1.4 NEF Worker
+- 輸入：`out.bie`
+- 輸出：`out.nef`
+- 輸出位置：同一工作目錄
+
+### 4.1.5 Core / Toolchain 路徑一致性
+- Worker 需將工作目錄 path 傳給 core
+- Core 需設定 toolchain 相關 path（輸出與中間檔）都指向該工作目錄
+
+---
+
 ## 5. 失敗行為（簡化）
 
 - Worker 例外 → 回報 fail
diff --git a/docs/KTC_PATCHES.md b/docs/KTC_PATCHES.md
new file mode 100644
index 0000000..05d218f
--- /dev/null
+++ b/docs/KTC_PATCHES.md
@@ -0,0 +1,37 @@
+# KTC Local Patch Notes
+
+This file records local changes made to `ktc` so future updates can be re-applied and re-tested.
+
+## 2026-01-28: Prefer prebuild toolchain binaries when USE_PREBUILD is set
+
+### Why
+- Toolchain binaries/scripts were hard-coded to `/workspace/libs_V2` or `/workspace/libs`.
+- In this repo, we want to use `toolchain/prebuild` without modifying those system paths.
+
+### Changes
+1) **Add `_resolve_compiler_paths()` helper**  
+   File: `ktc/toolchain.py`  
+   - If `USE_PREBUILD` exists and is a directory, uses:
+     - `prebuild/gen_config.py`
+     - `prebuild/batch_compile`
+     - `prebuild/kneron_nef_utils`
+     - `prebuild/opt_compile` (via `OPT_COMPILE_DIR`)
+   - Otherwise falls back to `LIBS_V1_FOLDER`/`LIBS_V2_FOLDER`.
+
+2) **Use `_resolve_compiler_paths()` in these functions:**
+   - `gen_config_for_single_model()` → uses `gen_config.py` from resolved path and sets `OPT_COMPILE_DIR`.
+   - `generate_batch_conf()` → uses `gen_config.py` from resolved path.
+   - `encrypt_compile()` → uses `batch_compile` (both 520 and non-520 cases) and `kneron_nef_utils` (for 730).
+
+### Reapply checklist (if KTC updated)
+- Re-add `_resolve_compiler_paths()` helper to `ktc/toolchain.py`.
+- Rewire the call sites listed above to use the helper.
+
+### Tests to run
+```
+pytest -s ./tests/workers/test_bie_core.py
+pytest -s ./tests/workers/test_nef_core.py
+```
+
+### Notes
+- `kneron_nef_utils` must exist in `toolchain/prebuild/`. If missing, copy it from `libs_V2/compiler/`.
diff --git a/ktc/onnx_optimizer_1_13.py b/ktc/onnx_optimizer_1_13.py
index 225ac66..1e48fd9 100644
--- a/ktc/onnx_optimizer_1_13.py
+++ b/ktc/onnx_optimizer_1_13.py
@@ -1,5 +1,8 @@
 import onnx
 import kneronnxopt
+import os
+import sys
+from pathlib import Path
 
 # Create a dummy function to print a message when the function is not defined in the current environment.
 def print_function_not_defined_message(*args, **kwargs):
@@ -8,9 +11,91 @@ def print_function_not_defined_message(*args, **kwargs):
     )
     return None
 
-kera2onnx_flow = print_function_not_defined_message
-caffe2onnx_flow = print_function_not_defined_message
-tflite2onnx_flow = print_function_not_defined_message
+def kera2onnx_flow(keras_model_path: str, optimize: int = 0, input_shape=None) -> onnx.ModelProto:
+    converter_root = Path(__file__).resolve().parents[1] / "libs" / "ONNX_Convertor" / "keras-onnx"
+    if not converter_root.exists():
+        raise FileNotFoundError(f"keras-onnx converter not found: {converter_root}")
+
+    converter_path = str(converter_root)
+    if converter_path not in sys.path:
+        sys.path.insert(0, converter_path)
+
+    try:
+        import onnx_keras  # type: ignore
+    except Exception as exc:
+        raise RuntimeError(
+            "kera2onnx_flow requires the keras-onnx converter and its dependencies (keras/tensorflow)."
+        ) from exc
+
+    onnx_keras.set_duplicate_weights(True)
+    converter = onnx_keras.frontend.KerasFrontend()
+    converter.loadFromFile(keras_model_path)
+    return converter.convertToOnnx(optimize, input_shape)
+
+
+def caffe2onnx_flow(caffe_prototxt_path: str, caffe_model_path: str) -> onnx.ModelProto:
+    converter_root = Path(__file__).resolve().parents[1] / "libs" / "ONNX_Convertor" / "caffe-onnx"
+    if not converter_root.exists():
+        raise FileNotFoundError(f"caffe-onnx converter not found: {converter_root}")
+
+    converter_path = str(converter_root)
+    if converter_path not in sys.path:
+        sys.path.insert(0, converter_path)
+
+    try:
+        import onnx_caffe  # type: ignore
+    except Exception as exc:
+        raise RuntimeError(
+            "caffe2onnx_flow requires the caffe-onnx converter and its dependencies (caffe)."
+        ) from exc
+
+    converter = onnx_caffe.frontend.CaffeFrontend()
+    converter.loadFromFile(caffe_prototxt_path, caffe_model_path)
+    return converter.convertToOnnx()
+def tflite2onnx_flow(tflite_path: str, release_mode: bool = True, bottom_nodes=None) -> onnx.ModelProto:
+    if bottom_nodes is None:
+        bottom_nodes = []
+
+    converter_root = Path(__file__).resolve().parents[1] / "libs" / "ONNX_Convertor" / "tflite-onnx" / "onnx_tflite"
+    if not converter_root.exists():
+        raise FileNotFoundError(f"tflite2onnx converter not found: {converter_root}")
+
+    converter_path = str(converter_root)
+    if converter_path not in sys.path:
+        sys.path.insert(0, converter_path)
+
+    try:
+        import tflite2onnx  # type: ignore
+    except Exception as exc:
+        raise RuntimeError(
+            "tflite2onnx_flow requires the tflite-onnx converter and its dependencies (tensorflow)."
+        ) from exc
+
+    # Compatibility: newer TF requires subgraph_index in _get_tensor_details.
+    try:
+        import tensorflow as tf  # type: ignore
+
+        if not getattr(tf.lite.Interpreter, "_ktc_compat_patched", False):
+            _orig_get_tensor_details = tf.lite.Interpreter._get_tensor_details
+
+            def _get_tensor_details_compat(self, tensor_index, *args, **kwargs):
+                if args or "subgraph_index" in kwargs:
+                    return _orig_get_tensor_details(self, tensor_index, *args, **kwargs)
+                try:
+                    return _orig_get_tensor_details(self, tensor_index)
+                except TypeError:
+                    return _orig_get_tensor_details(self, tensor_index, 0)
+
+            tf.lite.Interpreter._get_tensor_details = _get_tensor_details_compat  # type: ignore
+            tf.lite.Interpreter._ktc_compat_patched = True  # type: ignore
+    except Exception:
+        pass
+
+    output_dir = os.environ.get("KTC_WORKDIR") or os.environ.get("KTC_OUTPUT_DIR") or "/tmp"
+    os.makedirs(output_dir, exist_ok=True)
+    output_path = str(Path(output_dir) / "tflite_converted.onnx")
+
+    return tflite2onnx.main(tflite_path, output_path, add_transpose_for_channel_last_first_issue=not release_mode, bottom_nodes_name=bottom_nodes)
 
 def torch_exported_onnx_flow(
     m: onnx.ModelProto, disable_fuse_bn=False
diff --git a/ktc/toolchain.py b/ktc/toolchain.py
index f6ac391..d7f7c8d 100644
--- a/ktc/toolchain.py
+++ b/ktc/toolchain.py
@@ -26,6 +26,28 @@ from sys_flow.run import gen_fx_model as gen_fx_model_v1
 from sys_flow_v2.run import gen_fx_model as gen_fx_model_v2
 from sys_flow_v2.run import gen_opt_model_v2
 
+
+def _resolve_compiler_paths(platform: str):
+    """Resolve compiler binary/script paths, preferring USE_PREBUILD when set."""
+    prebuild = os.environ.get("USE_PREBUILD")
+    if prebuild and os.path.isdir(prebuild):
+        return {
+            "bin_dir": prebuild,
+            "opt_dir": os.path.join(prebuild, "opt_compile"),
+            "gen_config": os.path.join(prebuild, "gen_config.py"),
+            "batch_compile": os.path.join(prebuild, "batch_compile"),
+            "kneron_nef_utils": os.path.join(prebuild, "kneron_nef_utils"),
+        }
+    libs_folder = LIBS_V2_FOLDER if platform == "730" else LIBS_V1_FOLDER
+    compiler_dir = os.path.join(libs_folder, "compiler")
+    return {
+        "bin_dir": compiler_dir,
+        "opt_dir": os.path.join(compiler_dir, "opt_compile"),
+        "gen_config": os.path.join(compiler_dir, "gen_config.py"),
+        "batch_compile": os.path.join(compiler_dir, "batch_compile"),
+        "kneron_nef_utils": os.path.join(compiler_dir, "kneron_nef_utils"),
+    }
+
 if onnx.__version__ == "1.7.0":
     SUPPORTED_PLATFORMS = ["520", "720", "530", "630"]
 else:
@@ -98,16 +120,17 @@ class ModelConfig:
         self.debug = debug
         self.input_fmt = input_fmt
         if onnx_model is not None:
-            self.onnx_path = os.path.join(RESULT_FOLDER, "input.onnx")
-            if os.path.isfile(RESULT_FOLDER):
+            output_dir = os.environ.get("KTC_OUTPUT_DIR", RESULT_FOLDER)
+            self.onnx_path = os.path.join(output_dir, "input.onnx")
+            if os.path.isfile(output_dir):
                 logging.error(
-                    f"Folder {RESULT_FOLDER} cannot be created. File with same name exists."
+                    f"Folder {output_dir} cannot be created. File with same name exists."
                 )
                 raise ValueError(
-                    f"Folder {RESULT_FOLDER} cannot be created. File with same name exists."
+                    f"Folder {output_dir} cannot be created. File with same name exists."
                 )
-            elif not os.path.isdir(RESULT_FOLDER):
-                os.makedirs(RESULT_FOLDER)
+            elif not os.path.isdir(output_dir):
+                os.makedirs(output_dir)
             onnx.save(onnx_model, self.onnx_path)
         if self.onnx_path is None and self.bie_path is None:
             logging.error(
@@ -383,16 +406,12 @@ def gen_config_for_single_model(platform: str, model: str, id: str, hw_cut_opt=F
         else:
             logging.error("input_fmt should be str or dict.")
             exit(1)
-    # select libs folder based on platform
-    if platform == "730":
-        LIBS_FOLDER = LIBS_V2_FOLDER
-    else:
-        LIBS_FOLDER = LIBS_V1_FOLDER
-    os.environ["OPT_COMPILE_DIR"] = LIBS_FOLDER + "/compiler/opt_compile"
+    compiler_paths = _resolve_compiler_paths(platform)
+    os.environ["OPT_COMPILE_DIR"] = compiler_paths["opt_dir"]
     additional_json = json.dumps(additional_config)
     commands = [
         "python",
-        LIBS_FOLDER + "/compiler/gen_config.py",
+        compiler_paths["gen_config"],
         "-t",
         platform,
         "-v",
@@ -451,14 +470,11 @@ def generate_batch_conf(
         raise ValueError("Invalid version for batch compiler: " + platform)
 
     # Generate config file using compiler gen_config.py script
-    if platform == "730":
-        LIBS_FOLDER = LIBS_V2_FOLDER
-    else:
-        LIBS_FOLDER = LIBS_V1_FOLDER
+    compiler_paths = _resolve_compiler_paths(platform)
     subprocess.run(
         [
             "python",
-            LIBS_FOLDER + "/compiler/gen_config.py",
+            compiler_paths["gen_config"],
             "-t",
             platform,
             "-v",
@@ -618,6 +634,7 @@ def encrypt_compile(
 
     # Generate config and run
     if platform == "520":
+        compiler_paths = _resolve_compiler_paths(platform)
         generate_batch_conf(
             enc_config,
             "520",
@@ -635,7 +652,7 @@ def encrypt_compile(
         )
         os.chdir(output_dir)
         commands = [
-            LIBS_V1_FOLDER + "/compiler/batch_compile",
+            compiler_paths["batch_compile"],
             "-T",
             "520",
             output_dir + "/batch_compile_bconfig.json",
@@ -660,12 +677,9 @@ def encrypt_compile(
             hw_cut_opt=hardware_cut_opt,
         )
         os.chdir(output_dir)
-        if platform == "730":
-            LIBS_FOLDER = LIBS_V2_FOLDER
-        else:
-            LIBS_FOLDER = LIBS_V1_FOLDER
+        compiler_paths = _resolve_compiler_paths(platform)
         commands = [
-            LIBS_FOLDER + "/compiler/batch_compile",
+            compiler_paths["batch_compile"],
             "-T",
             platform,
             output_dir + "/batch_compile_bconfig.json",
@@ -679,7 +693,7 @@ def encrypt_compile(
             # Use kne to generate nef file
             subprocess.run(
                 [
-                    LIBS_V2_FOLDER + "/compiler/kneron_nef_utils",
+                    compiler_paths["kneron_nef_utils"],
                     "-G",
                     "--kne",
                     output_dir + "/models_730.kne",
@@ -693,7 +707,7 @@ def encrypt_compile(
             # Update model info
             subprocess.run(
                 [
-                    LIBS_V2_FOLDER + "/compiler/kneron_nef_utils",
+                    compiler_paths["kneron_nef_utils"],
                     "-U",
                     output_dir + "/models_730.nef",
                     "--model_info_version",
diff --git a/ktc/utils.py b/ktc/utils.py
index 134cdf9..e5dd038 100644
--- a/ktc/utils.py
+++ b/ktc/utils.py
@@ -11,8 +11,8 @@ if onnx.__version__ == '1.7.0':
 else:
     from extract_bie_info import extract_bie_ioinfo
 
-RESULT_FOLDER = "/data1/kneron_flow"
-TMP_FOLDER = "/workspace/.tmp"
+RESULT_FOLDER = os.environ.get("KTC_OUTPUT_DIR", "/data1/kneron_flow")
+TMP_FOLDER = os.environ.get("KTC_WORKDIR", "/workspace/.tmp")
 LIBS_V1_FOLDER = "/workspace/libs"
 LIBS_V2_FOLDER = "/workspace/libs_V2"
 SCRIPT_FOLDER = "/workspace/scripts"
diff --git a/libs/ONNX_Convertor/tflite-onnx/onnx_tflite/tflite2onnx.py b/libs/ONNX_Convertor/tflite-onnx/onnx_tflite/tflite2onnx.py
index 39870ee..052212b 100644
--- a/libs/ONNX_Convertor/tflite-onnx/onnx_tflite/tflite2onnx.py
+++ b/libs/ONNX_Convertor/tflite-onnx/onnx_tflite/tflite2onnx.py
@@ -401,7 +401,8 @@ def main(model_path, model_save_path=None, add_transpose_for_channel_last_first_
     # add generated time to model meta data
     helper.set_model_props(cnn_model, {'Generated Time': datetime.utcnow().strftime("%m/%d/%Y, %H:%M:%S") + " (UTC+0)"})
 
-    cnn_model = onnx.utils.polish_model(cnn_model)
+    if hasattr(onnx.utils, "polish_model"):
+        cnn_model = onnx.utils.polish_model(cnn_model)
 
     # save
     if model_save_path is not None:
@@ -454,4 +455,3 @@ if __name__ == '__main__':
         logging.getLogger('tflite2onnx').error(e)
 
     logging.info('------------   end   ------------------------')
-
diff --git a/libs/ONNX_Convertor/tflite-onnx/onnx_tflite/tflite_utils.py b/libs/ONNX_Convertor/tflite-onnx/onnx_tflite/tflite_utils.py
index 9c4583c..0446594 100644
--- a/libs/ONNX_Convertor/tflite-onnx/onnx_tflite/tflite_utils.py
+++ b/libs/ONNX_Convertor/tflite-onnx/onnx_tflite/tflite_utils.py
@@ -124,10 +124,10 @@ def create_constant_node(node_name, shape, data):
     # default data type
     data_type = onnx.helper.TensorProto.FLOAT
 
-    if data.dtype == np.int or data.dtype == np.int64:
+    if np.issubdtype(data.dtype, np.integer):
         data_type = onnx.helper.TensorProto.INT64
 
-    elif data.dtype == np.float or data.dtype == np.float64:
+    elif np.issubdtype(data.dtype, np.floating):
         data_type = onnx.helper.TensorProto.FLOAT
 
     else:
diff --git a/requirements.txt b/requirements.txt
index 59635f1..3143476 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,16 +12,17 @@ httpx
 python-multipart
 pyzipper
 
-# Model processing dependencies
-onnx
-onnxruntime
-onnxoptimizer
-tf2onnx
-tflite2onnx
-keras2onnx
-onnxsim; python_version < "3.12"
-onnx-tf
-onnx2torch
+# Model processing dependencies
+onnx==1.14.1
+onnxruntime
+onnxoptimizer
+tf2onnx
+tflite2onnx
+tensorflow==2.16.2
+keras2onnx
+onnxsim; python_version < "3.12"
+onnx-tf
+onnx2torch
 
 # Image processing
 Pillow
@@ -33,8 +34,9 @@ scipy
 matplotlib
 seaborn
 
-# Utilities
-python-dotenv
+# Utilities
+python-dotenv
+python-igraph
 
 # Development dependencies
 pytest
diff --git a/services/workers/bie/core.py b/services/workers/bie/core.py
index 2080992..8ee8677 100644
--- a/services/workers/bie/core.py
+++ b/services/workers/bie/core.py
@@ -2,7 +2,6 @@ import os
 import shutil
 from typing import Dict, Any
 
-import ktc
 import onnx
 
 try:
@@ -24,9 +23,17 @@ def process_bie_core(
     if not os.path.isdir(data_dir):
         raise FileNotFoundError(f"Data directory not found: {data_dir}")
 
-    output_dir = os.path.dirname(output_path)
-    if output_dir:
-        os.makedirs(output_dir, exist_ok=True)
+    output_dir = os.path.dirname(output_path)
+    if output_dir:
+        os.makedirs(output_dir, exist_ok=True)
+        work_root = parameters.get("work_dir") or output_dir
+        work_dir = os.path.join(work_root, "_work")
+        res_dir = os.path.join(work_root, "res")
+        os.environ.setdefault("KTC_OUTPUT_DIR", work_root)
+        os.environ.setdefault("KTC_WORKDIR", work_dir)
+        os.environ.setdefault("KTC_SCRIPT_RES", res_dir)
+
+    import ktc
 
     model = onnx.load(onnx_file_path)
     model = ktc.onnx_optimizer.onnx2onnx_flow(model, eliminate_tail=True, opt_matmul=True)
@@ -59,10 +66,11 @@ def process_bie_core(
             )
             img_list.append(img_data)
 
-    bie_model_path = km.analysis({input_node_name: img_list}, output_dir=output_dir or ".")
-
-    if os.path.abspath(bie_model_path) != os.path.abspath(output_path):
-        shutil.copy2(str(bie_model_path), output_path)
+    bie_model_path = km.analysis({input_node_name: img_list}, output_dir=output_dir or ".")
+
+    if os.path.abspath(bie_model_path) != os.path.abspath(output_path):
+        # Move to avoid keeping duplicate large binaries on disk.
+        shutil.move(str(bie_model_path), output_path)
 
     return {
         "file_path": output_path,
diff --git a/services/workers/nef/core.py b/services/workers/nef/core.py
index 1d39793..1be650f 100644
--- a/services/workers/nef/core.py
+++ b/services/workers/nef/core.py
@@ -2,7 +2,6 @@ import os
 import shutil
 from typing import Dict, Any
 
-import ktc
 
 
 def process_nef_core(
@@ -14,9 +13,17 @@ def process_nef_core(
     if not os.path.exists(bie_file_path):
         raise FileNotFoundError(f"BIE file not found: {bie_file_path}")
 
-    output_dir = os.path.dirname(output_path)
-    if output_dir:
-        os.makedirs(output_dir, exist_ok=True)
+    output_dir = os.path.dirname(output_path)
+    if output_dir:
+        os.makedirs(output_dir, exist_ok=True)
+        work_root = parameters.get("work_dir") or output_dir
+        work_dir = os.path.join(work_root, "_work")
+        res_dir = os.path.join(work_root, "res")
+        os.environ.setdefault("KTC_OUTPUT_DIR", work_root)
+        os.environ.setdefault("KTC_WORKDIR", work_dir)
+        os.environ.setdefault("KTC_SCRIPT_RES", res_dir)
+
+    import ktc
 
     km = ktc.ModelConfig(
         parameters["model_id"],
@@ -25,8 +32,10 @@ def process_nef_core(
         bie_path=bie_file_path,
     )
 
-    nef_model_path = ktc.compile([km])
-    shutil.copy2(str(nef_model_path), output_path)
+    nef_model_path = ktc.compile([km], output_dir=output_dir or None)
+    if os.path.abspath(nef_model_path) != os.path.abspath(output_path):
+        # Move to avoid keeping duplicate large binaries on disk.
+        shutil.move(str(nef_model_path), output_path)
 
     return {
         "file_path": output_path,
diff --git a/services/workers/onnx/core.py b/services/workers/onnx/core.py
index 7d68a4c..a56f597 100644
--- a/services/workers/onnx/core.py
+++ b/services/workers/onnx/core.py
@@ -1,8 +1,7 @@
 import os
 from typing import Dict, Any
 
-import ktc
-import onnx
+import onnx
 
 
 def process_onnx_core(
@@ -14,9 +13,17 @@ def process_onnx_core(
     if not os.path.exists(file_path):
         raise FileNotFoundError(f"Input file not found: {file_path}")
 
-    output_dir = os.path.dirname(output_path)
-    if output_dir:
-        os.makedirs(output_dir, exist_ok=True)
+    output_dir = os.path.dirname(output_path)
+    if output_dir:
+        os.makedirs(output_dir, exist_ok=True)
+        work_root = parameters.get("work_dir") or output_dir
+        work_dir = os.path.join(work_root, "_work")
+        res_dir = os.path.join(work_root, "res")
+        os.environ.setdefault("KTC_OUTPUT_DIR", work_root)
+        os.environ.setdefault("KTC_WORKDIR", work_dir)
+        os.environ.setdefault("KTC_SCRIPT_RES", res_dir)
+
+    import ktc
 
     file_extension = os.path.splitext(file_path)[1].lower()
     if file_extension == ".tflite":
diff --git a/tests/conftest.py b/tests/conftest.py
index ecf4cec..b10439d 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -31,3 +31,18 @@ if e2e_flow_path.is_dir():
 prebuild_path = repo_root / "toolchain" / "prebuild"
 if prebuild_path.is_dir():
     os.environ.setdefault("USE_PREBUILD", str(prebuild_path))
+    prebuild_lib = prebuild_path / "lib"
+    if prebuild_lib.is_dir():
+        existing_ld = os.environ.get("LD_LIBRARY_PATH", "")
+        ld_parts = [str(prebuild_lib)]
+        if existing_ld:
+            ld_parts.append(existing_ld)
+        os.environ["LD_LIBRARY_PATH"] = ":".join(ld_parts)
+
+# Force pytest/tempfile to use repo-local temp dir instead of system /tmp.
+repo_tmp = repo_root / ".tmp"
+repo_tmp.mkdir(parents=True, exist_ok=True)
+os.environ.setdefault("TMPDIR", str(repo_tmp))
+
+# Avoid multiprocessing Manager sockets in restricted test environments.
+os.environ.setdefault("KTC_DISABLE_MP", "1")
diff --git a/tests/fixtures/bie/input.bie b/tests/fixtures/bie/input.bie
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index 0000000..c24b98c
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diff --git a/tests/fixtures/bie_images/99.jpg b/tests/fixtures/bie_images/99.jpg
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diff --git a/tests/fixtures/onnx/input.tflite b/tests/fixtures/onnx/input.tflite
new file mode 100644
index 0000000..ee6fd4a
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diff --git a/tests/workers/test_flow_e2e.py b/tests/workers/test_flow_e2e.py
new file mode 100644
index 0000000..2370bdc
--- /dev/null
+++ b/tests/workers/test_flow_e2e.py
@@ -0,0 +1,79 @@
+from pathlib import Path
+import random
+import shutil
+import sys
+
+ROOT = Path(__file__).resolve().parents[2]
+sys.path.insert(0, str(ROOT))
+
+from services.workers.onnx.core import process_onnx_core
+from services.workers.bie.core import process_bie_core
+from services.workers.nef.core import process_nef_core
+
+
+def test_worker_flow_e2e_uses_single_workdir():
+    base_outputs = ROOT / "tests" / "fixtures" / "outputs"
+    base_outputs.mkdir(parents=True, exist_ok=True)
+
+    task_id = None
+    work_dir = None
+    for _ in range(50):
+        candidate = random.randint(100, 999)
+        candidate_dir = base_outputs / str(candidate)
+        if not candidate_dir.exists():
+            task_id = candidate
+            work_dir = candidate_dir
+            break
+    assert task_id is not None, "Unable to allocate a unique task id"
+
+    work_dir.mkdir(parents=True, exist_ok=False)
+
+    src_onnx_dir = ROOT / "tests" / "fixtures" / "onnx"
+    src_images_dir = ROOT / "tests" / "fixtures" / "bie_images"
+    ref_images_dir = work_dir / "ref_images"
+
+    onnx_files = [p for p in src_onnx_dir.iterdir() if p.is_file() and p.suffix == ".onnx"]
+    assert len(onnx_files) == 1, "Expected a single ONNX fixture file"
+    input_file = work_dir / onnx_files[0].name
+    shutil.copy2(onnx_files[0], input_file)
+    shutil.copytree(src_images_dir, ref_images_dir)
+
+    work_inputs = [p for p in work_dir.iterdir() if p.is_file()]
+    assert len(work_inputs) == 1, "Working directory must contain a single input file"
+    work_input_file = work_inputs[0]
+
+    onnx_output = work_dir / "out.onnx"
+    onnx_params = {"model_id": 10, "version": "e2e", "platform": "520", "work_dir": str(work_dir)}
+    onnx_result = process_onnx_core(
+        {"file_path": str(work_input_file)},
+        str(onnx_output),
+        onnx_params,
+    )
+
+    assert onnx_output.exists()
+    assert onnx_result["file_path"] == str(onnx_output)
+    assert onnx_result["file_size"] > 0
+
+    bie_output = work_dir / "out.bie"
+    bie_params = {"model_id": 11, "version": "e2e", "platform": "530", "work_dir": str(work_dir)}
+    bie_result = process_bie_core(
+        {"onnx_file_path": str(onnx_output), "data_dir": str(ref_images_dir)},
+        str(bie_output),
+        bie_params,
+    )
+
+    assert bie_output.exists()
+    assert bie_result["file_path"] == str(bie_output)
+    assert bie_result["file_size"] > 0
+
+    nef_output = work_dir / "out.nef"
+    nef_params = {"model_id": 12, "version": "e2e", "platform": "730", "work_dir": str(work_dir)}
+    nef_result = process_nef_core(
+        {"bie_file_path": str(bie_output)},
+        str(nef_output),
+        nef_params,
+    )
+
+    assert nef_output.exists()
+    assert nef_result["file_path"] == str(nef_output)
+    assert nef_result["file_size"] > 0
diff --git a/tests/workers/test_flow_e2e_tflite.py b/tests/workers/test_flow_e2e_tflite.py
new file mode 100644
index 0000000..7edf4d2
--- /dev/null
+++ b/tests/workers/test_flow_e2e_tflite.py
@@ -0,0 +1,79 @@
+from pathlib import Path
+import random
+import shutil
+import sys
+
+ROOT = Path(__file__).resolve().parents[2]
+sys.path.insert(0, str(ROOT))
+
+from services.workers.onnx.core import process_onnx_core
+from services.workers.bie.core import process_bie_core
+from services.workers.nef.core import process_nef_core
+
+
+def test_worker_flow_e2e_tflite_uses_single_workdir():
+    base_outputs = ROOT / "tests" / "fixtures" / "outputs"
+    base_outputs.mkdir(parents=True, exist_ok=True)
+
+    task_id = None
+    work_dir = None
+    for _ in range(50):
+        candidate = random.randint(100, 999)
+        candidate_dir = base_outputs / str(candidate)
+        if not candidate_dir.exists():
+            task_id = candidate
+            work_dir = candidate_dir
+            break
+    assert task_id is not None, "Unable to allocate a unique task id"
+
+    work_dir.mkdir(parents=True, exist_ok=False)
+
+    src_onnx_dir = ROOT / "tests" / "fixtures" / "onnx"
+    src_images_dir = ROOT / "tests" / "fixtures" / "bie_images"
+    ref_images_dir = work_dir / "ref_images"
+
+    tflite_files = [p for p in src_onnx_dir.iterdir() if p.is_file() and p.suffix == ".tflite"]
+    assert len(tflite_files) == 1, "Expected a single TFLite fixture file"
+    input_file = work_dir / tflite_files[0].name
+    shutil.copy2(tflite_files[0], input_file)
+    shutil.copytree(src_images_dir, ref_images_dir)
+
+    work_inputs = [p for p in work_dir.iterdir() if p.is_file()]
+    assert len(work_inputs) == 1, "Working directory must contain a single input file"
+    work_input_file = work_inputs[0]
+
+    onnx_output = work_dir / "out.onnx"
+    onnx_params = {"model_id": 20, "version": "e2e-tflite", "platform": "520", "work_dir": str(work_dir)}
+    onnx_result = process_onnx_core(
+        {"file_path": str(work_input_file)},
+        str(onnx_output),
+        onnx_params,
+    )
+
+    assert onnx_output.exists()
+    assert onnx_result["file_path"] == str(onnx_output)
+    assert onnx_result["file_size"] > 0
+
+    bie_output = work_dir / "out.bie"
+    bie_params = {"model_id": 21, "version": "e2e-tflite", "platform": "530", "work_dir": str(work_dir)}
+    bie_result = process_bie_core(
+        {"onnx_file_path": str(onnx_output), "data_dir": str(ref_images_dir)},
+        str(bie_output),
+        bie_params,
+    )
+
+    assert bie_output.exists()
+    assert bie_result["file_path"] == str(bie_output)
+    assert bie_result["file_size"] > 0
+
+    nef_output = work_dir / "out.nef"
+    nef_params = {"model_id": 22, "version": "e2e-tflite", "platform": "730", "work_dir": str(work_dir)}
+    nef_result = process_nef_core(
+        {"bie_file_path": str(bie_output)},
+        str(nef_output),
+        nef_params,
+    )
+
+    assert nef_output.exists()
+    assert nef_result["file_path"] == str(nef_output)
+    assert nef_result["file_size"] > 0
diff --git a/tests/workers/test_onnx_core.py b/tests/workers/test_onnx_core.py
index 84e85ae..589ffc8 100644
--- a/tests/workers/test_onnx_core.py
+++ b/tests/workers/test_onnx_core.py
@@ -7,7 +7,7 @@ sys.path.insert(0, str(ROOT))
 from services.workers.onnx.core import process_onnx_core
 
 
-def test_process_onnx_core_creates_output():
+def test_process_onnx_core_creates_output():
     input_file = ROOT / "tests" / "fixtures" / "onnx" / "input.onnx"
     output_file = ROOT / "tests" / "fixtures" / "outputs" / "out.onnx"
 
@@ -21,6 +21,6 @@ def test_process_onnx_core_creates_output():
         params,
     )
 
-    assert output_file.exists()
-    assert result["file_path"] == str(output_file)
-    assert result["file_size"] > 0
+    assert output_file.exists()
+    assert result["file_path"] == str(output_file)
+    assert result["file_size"] > 0
diff --git a/tests/workers/test_onnx_core_tflite.py b/tests/workers/test_onnx_core_tflite.py
new file mode 100644
index 0000000..231d9c4
--- /dev/null
+++ b/tests/workers/test_onnx_core_tflite.py
@@ -0,0 +1,26 @@
+from pathlib import Path
+import sys
+
+ROOT = Path(__file__).resolve().parents[2]
+sys.path.insert(0, str(ROOT))
+
+from services.workers.onnx.core import process_onnx_core
+
+
+def test_process_tflite_core_creates_output():
+    input_file = ROOT / "tests" / "fixtures" / "onnx" / "input.tflite"
+    output_file = ROOT / "tests" / "fixtures" / "outputs" / "out_from_tflite.onnx"
+
+    assert input_file.exists(), f"Missing input file: {input_file}"
+
+    params = {"model_id": 4, "version": "tflite", "platform": "520"}
+
+    result = process_onnx_core(
+        {"file_path": str(input_file)},
+        str(output_file),
+        params,
+    )
+
+    assert output_file.exists()
+    assert result["file_path"] == str(output_file)
+    assert result["file_size"] > 0
diff --git a/toolchain/prebuild/batch_compile b/toolchain/prebuild/batch_compile
old mode 100644
new mode 100755
diff --git a/toolchain/prebuild/compile b/toolchain/prebuild/compile
old mode 100644
new mode 100755
diff --git a/toolchain/prebuild/dataConverter b/toolchain/prebuild/dataConverter
old mode 100644
new mode 100755
diff --git a/toolchain/prebuild/gen_config.py b/toolchain/prebuild/gen_config.py
old mode 100644
new mode 100755
diff --git a/toolchain/prebuild/get_run_val.py b/toolchain/prebuild/get_run_val.py
old mode 100644
new mode 100755
diff --git a/toolchain/prebuild/kneron_nef_utils b/toolchain/prebuild/kneron_nef_utils
new file mode 100755
index 0000000..80eb7bc
Binary files /dev/null and b/toolchain/prebuild/kneron_nef_utils differ
diff --git a/toolchain/prebuild/lib/libbfd-2.34-system.so b/toolchain/prebuild/lib/libbfd-2.34-system.so
new file mode 100644
index 0000000..559bb55
Binary files /dev/null and b/toolchain/prebuild/lib/libbfd-2.34-system.so differ
diff --git a/toolchain/prebuild/lib/libgfortran.so.5 b/toolchain/prebuild/lib/libgfortran.so.5
new file mode 100644
index 0000000..78702ea
Binary files /dev/null and b/toolchain/prebuild/lib/libgfortran.so.5 differ
diff --git a/toolchain/prebuild/lib/libopenblas.so.0 b/toolchain/prebuild/lib/libopenblas.so.0
new file mode 100644
index 0000000..2e6aa26
Binary files /dev/null and b/toolchain/prebuild/lib/libopenblas.so.0 differ
diff --git a/toolchain/prebuild/model_converter b/toolchain/prebuild/model_converter
old mode 100644
new mode 100755
diff --git a/toolchain/prebuild/run_fix_inference b/toolchain/prebuild/run_fix_inference
old mode 100644
new mode 100755
diff --git a/toolchain/prebuild/run_updater b/toolchain/prebuild/run_updater
old mode 100644
new mode 100755
diff --git a/vendor/sys_flow/flow_constants.py b/vendor/sys_flow/flow_constants.py
index 2a2f54a..9092fb8 100644
--- a/vendor/sys_flow/flow_constants.py
+++ b/vendor/sys_flow/flow_constants.py
@@ -162,7 +162,8 @@ def binary_in_toolchain():
 
     d_binary["ip_eval"] = {}
     for platform in MODE_HARDWARE:
-        d_binary["ip_eval"][platform] = f"/workspace/scripts/res/ip_config_{platform}.json"
+        res_dir = os.environ.get("KTC_SCRIPT_RES", "/workspace/scripts/res")
+        d_binary["ip_eval"][platform] = f"{res_dir}/ip_config_{platform}.json"
 
     d_binary["csim"] = {}
     for platform in MODE_HW_LIMIT["inc_in_toolchain"]:
diff --git a/vendor/sys_flow/run.py b/vendor/sys_flow/run.py
index 49791ad..a56bee2 100644
--- a/vendor/sys_flow/run.py
+++ b/vendor/sys_flow/run.py
@@ -262,11 +262,16 @@ class report:
 
     def __init__(self):
         self.err_log = defaultdict(dict)
-        manager = multiprocessing.Manager()
-        # below are mutli-process safe.
+        manager = None
+        if os.environ.get("KTC_DISABLE_MP") != "1":
+            try:
+                manager = multiprocessing.Manager()
+            except Exception:
+                manager = None
+        # below are mutli-process safe when manager is available.
         # but don't use dict of dict, or complex object. which is not safe.
-        self.info_collection = manager.list()  # collect snr, FPS ...
-        self.time_collection = manager.list()
+        self.info_collection = manager.list() if manager else []  # collect snr, FPS ...
+        self.time_collection = manager.list() if manager else []
 
     def add_err_record(self, err):
         """Used as callback after multi-processing.
@@ -735,10 +740,14 @@ def gen_fx_model(
 
     # working directory
     # NOTE: p_working must be same as specified in template/regression_tc.json/path/cases
-    p_working = pathlib.Path("/workspace/.tmp/models")
+    env_workdir = os.environ.get("KTC_WORKDIR")
+    p_working = pathlib.Path(env_workdir or "/workspace/.tmp/models")
     p_working.mkdir(parents=True, exist_ok=True)
 
     # prepare working_model_folder
+    env_output = os.environ.get("KTC_OUTPUT_DIR")
+    if env_output and p_output == "/data1/kneron_flow":
+        p_output = env_output
     p_export = pathlib.Path(p_output)
     p_export.mkdir(parents=True, exist_ok=True)
 
@@ -774,6 +783,10 @@ def gen_fx_model(
     p_template = p_script / "template" / "regression_tc.json"
     with open(p_template, "r") as f:
         template = json.load(f)
+    if env_workdir:
+        path_cfg = template.setdefault("path", {})
+        path_cfg["cases"] = str(p_working)
+        path_cfg["report"] = str(p_working / "report")
 
     # verify knerex parameters
     # choose from mmse / percentage
@@ -837,7 +850,9 @@ def gen_fx_model(
         # override the ip_evaluator in toolchain.
         # s1.json will based on this file. if necessary.
         ip_config = gen_ip_config(platform, weight_bandwidth, dma_bandwidth)
-        fn_ip_config = "/workspace/scripts/res/ip_config_{}.json".format(platform)
+        res_dir = os.environ.get("KTC_SCRIPT_RES", "/workspace/scripts/res")
+        os.makedirs(res_dir, exist_ok=True)
+        fn_ip_config = os.path.join(res_dir, f"ip_config_{platform}.json")
         with open(fn_ip_config, "w") as f:
             json.dump(ip_config, f, indent=4, sort_keys=True)
 
@@ -901,9 +916,10 @@ def gen_fx_model(
         try:
             p_model = prepare_model_ip_eval_only()
             rfs, success_list = run_flow(p_json, [m_name])
-            fn_to_release = rfs[0]  # only one model
+            fn_to_release = rfs[0] if rfs else {}
             success = True, fn_to_release
         except Exception as e:
+            print(f"[ip_eval_only] exception: {e}")
             success = False, None
 
         return success
diff --git a/vendor/sys_flow_v2/flow_constants.py b/vendor/sys_flow_v2/flow_constants.py
index 40a8784..62ca512 100644
--- a/vendor/sys_flow_v2/flow_constants.py
+++ b/vendor/sys_flow_v2/flow_constants.py
@@ -158,7 +158,8 @@ def binary_in_toolchain():
 
     d_binary["ip_eval"] = {}
     for platform in MODE_HARDWARE:
-        d_binary["ip_eval"][platform] = f"/workspace/scripts/res/ip_config_{platform}.json"
+        res_dir = os.environ.get("KTC_SCRIPT_RES", "/workspace/scripts/res")
+        d_binary["ip_eval"][platform] = f"{res_dir}/ip_config_{platform}.json"
 
     d_binary["csim"] = {}
     for platform in MODE_HW_LIMIT["inc_in_toolchain"]:
diff --git a/vendor/sys_flow_v2/run.py b/vendor/sys_flow_v2/run.py
index 69c45d5..fec3cde 100644
--- a/vendor/sys_flow_v2/run.py
+++ b/vendor/sys_flow_v2/run.py
@@ -145,6 +145,9 @@ def gen_opt_model(
         generate a new user_config.json and run -> final.opt.onnx
     """
     
+    env_output = os.environ.get("KTC_OUTPUT_DIR")
+    if env_output and p_output == "/data1/kneron_flow":
+        p_output = env_output
     assert platform == 730, f"Only platform 730 is supported."
     assert optimize == "o0", f"Only optimize o0 is supported."
     
@@ -173,7 +176,8 @@ def gen_opt_model(
         msg = f"Given onnx {p_onnx} does not exist!"
         raise FileExistsError(msg)
 
-    p_working = Path("/workspace/.tmp/models")
+    env_workdir = os.environ.get("KTC_WORKDIR")
+    p_working = Path(env_workdir or "/workspace/.tmp/models")
     p_model = p_working / m_name / m_name
     p_model_16 = p_working / f"{m_name}_16" / f"{m_name}_16"
     p_model_light = p_working / f"{m_name}_light" / f"{m_name}_light"
@@ -343,6 +347,12 @@ def gen_opt_model_v2(
     使用15bit的conv浮点运算量占比，flops_ratio=0, 所有conv使用8bit，flops_ratio=1.0， 所有conv使用15bit.
     """
     
+    env_output = os.environ.get("KTC_OUTPUT_DIR")
+    env_workdir = os.environ.get("KTC_WORKDIR")
+    if env_output and p_output == "/data1/kneron_flow":
+        p_output = env_output
+    if env_workdir and p_cache == "/workspace/.tmp/models":
+        p_cache = env_workdir
     gen_fx_model_params = {
         "p_onnx": p_onnx,
         "np_txt": np_txt,
@@ -783,10 +793,16 @@ def gen_fx_model(
 
     # working directory
     # NOTE: p_working must be same as specified in template/regression_tc.json/path/cases
+    env_workdir = os.environ.get("KTC_WORKDIR")
+    if env_workdir and p_cache == "/workspace/.tmp/models":
+        p_cache = env_workdir
     p_working = Path(p_cache)
     p_working.mkdir(parents=True, exist_ok=True)
 
     # prepare working_model_folder
+    env_output = os.environ.get("KTC_OUTPUT_DIR")
+    if env_output and p_output == "/data1/kneron_flow":
+        p_output = env_output
     p_export = Path(p_output)
     p_export.mkdir(parents=True, exist_ok=True)
 
@@ -905,7 +921,9 @@ def gen_fx_model(
         # override the ip_evaluator in toolchain.
         # s1.json will based on this file. if necessary.
         ip_config = gen_ip_config(platform, weight_bandwidth, dma_bandwidth)
-        fn_ip_config = f"/workspace/scripts/res/ip_config_{platform}.json"
+        res_dir = os.environ.get("KTC_SCRIPT_RES", "/workspace/scripts/res")
+        os.makedirs(res_dir, exist_ok=True)
+        fn_ip_config = os.path.join(res_dir, f"ip_config_{platform}.json")
         futils.dict2json(ip_config, fn_ip_config)
 
     update_config_ip_val(weight_bandwidth, dma_bandwidth, platform)