Feat: Update validate_config and add tests

src/axolotl/utils/validation.py

@@ -3,24 +3,39 @@ import logging
 
 def validate_config(cfg):
     if cfg.load_4bit:
-        raise ValueError("cfg.load_4bit parameter has been deprecated and replaced by cfg.gptq")
+        raise ValueError(
+            "cfg.load_4bit parameter has been deprecated and replaced by cfg.gptq"
+        )
 
     if cfg.adapter == "qlora":
         if cfg.merge_lora:
             # can't merge qlora if loaded in 8bit or 4bit
-            assert cfg.load_in_8bit is not True
+            if cfg.load_in_8bit:
-            assert cfg.gptq is not True
+                raise ValueError("Can't merge qlora if loaded in 8bit")
-            assert cfg.load_in_4bit is not True
+
+            if cfg.gptq:
+                raise ValueError("Can't merge qlora if gptq")
+
+            if cfg.load_in_4bit:
+                raise ValueError("Can't merge qlora if loaded in 4bit")
+
         else:
-            assert cfg.load_in_8bit is not True
+            if cfg.load_in_8bit:
-            assert cfg.gptq is not True
+                raise ValueError("Can't load qlora in 8bit")
-            assert cfg.load_in_4bit is True
+
+            if cfg.gptq:
+                raise ValueError("Can't load qlora if gptq")
+
+            if not cfg.load_in_4bit:
+                raise ValueError("Require cfg.load_in_4bit to be True for qlora")
 
     if not cfg.load_in_8bit and cfg.adapter == "lora":
         logging.warning("We recommend setting `load_in_8bit: true` for LORA finetuning")
-        
+
     if cfg.trust_remote_code:
-        logging.warning("`trust_remote_code` is set to true. Please make sure that you reviewed the remote code/model.")
+        logging.warning(
+            "`trust_remote_code` is set to true. Please make sure that you reviewed the remote code/model."
+        )
 
     # TODO
     # MPT 7b

tests/test_validation.py

@@ -0,0 +1,95 @@
+import unittest
+
+import pytest
+
+from axolotl.utils.validation import validate_config
+from axolotl.utils.dict import DictDefault
+
+
+class ValidationTest(unittest.TestCase):
+    def test_load_4bit_deprecate(self):
+        cfg = DictDefault(
+            {
+                "load_4bit": True,
+            }
+        )
+
+        with pytest.raises(ValueError):
+            validate_config(cfg)
+
+    def test_qlora(self):
+        base_cfg = DictDefault(
+            {
+                "adapter": "qlora",
+            }
+        )
+
+        cfg = base_cfg | DictDefault(
+            {
+                "load_in_8bit": True,
+            }
+        )
+
+        with pytest.raises(ValueError, match=r".*8bit.*"):
+            validate_config(cfg)
+
+        cfg = base_cfg | DictDefault(
+            {
+                "gptq": True,
+            }
+        )
+
+        with pytest.raises(ValueError, match=r".*gptq.*"):
+            validate_config(cfg)
+
+        cfg = base_cfg | DictDefault(
+            {
+                "load_in_4bit": False,
+            }
+        )
+
+        with pytest.raises(ValueError, match=r".*4bit.*"):
+            validate_config(cfg)
+
+        cfg = base_cfg | DictDefault(
+            {
+                "load_in_4bit": True,
+            }
+        )
+
+        validate_config(cfg)
+
+    def test_qlora_merge(self):
+        base_cfg = DictDefault(
+            {
+                "adapter": "qlora",
+                "merge_lora": True,
+            }
+        )
+
+        cfg = base_cfg | DictDefault(
+            {
+                "load_in_8bit": True,
+            }
+        )
+
+        with pytest.raises(ValueError, match=r".*8bit.*"):
+            validate_config(cfg)
+
+        cfg = base_cfg | DictDefault(
+            {
+                "gptq": True,
+            }
+        )
+
+        with pytest.raises(ValueError, match=r".*gptq.*"):
+            validate_config(cfg)
+
+        cfg = base_cfg | DictDefault(
+            {
+                "load_in_4bit": True,
+            }
+        )
+
+        with pytest.raises(ValueError, match=r".*4bit.*"):
+            validate_config(cfg)