refactor and fixing test isolation issues

src/axolotl/cli/integrations/convert_diff_transformer.py

@@ -1,4 +1,5 @@
-"""CLI to convert a transformers model's attns to diff attns."""
+"""CLI to convert a transformers model's attention layers to differential attention layers."""
+
 import logging
 import warnings
 from pathlib import Path
@@ -127,6 +128,7 @@ def convert_diff_transformer(cfg, cli_args, config_path):
         else:
             modified_cfg["plugins"] = [plugin_class]
 
+        # Write out the updated axolotl config while preserving original ordering / formatting
         dump_yaml_preserved_order(
             data=modified_cfg,
             reference_yaml_path=config_path,

src/axolotl/common/cli.py

@@ -12,14 +12,12 @@
 from axolotl.utils.models import load_model, load_tokenizer
 
 configure_logging()
-LOG = logging.getLogger("axolotl.common.cli")
+LOG = logging.getLogger(__name__)
 
 
 @dataclass
 class PreprocessCliArgs:
-    """
-    dataclass with arguments for preprocessing only
-    """
+    """dataclass with arguments for preprocessing only"""
 
     debug: bool = field(default=False)
     debug_text_only: bool = field(default=False)
@@ -30,9 +28,7 @@ class PreprocessCliArgs:
 
 @dataclass
 class TrainerCliArgs:
-    """
-    dataclass with various non-training arguments
-    """
+    """dataclass with various non-training arguments"""
 
     debug: bool = field(default=False)
     debug_text_only: bool = field(default=False)
@@ -45,9 +41,7 @@ class TrainerCliArgs:
 
 @dataclass
 class EvaluateCliArgs:
-    """
-    dataclass with various evaluation arguments
-    """
+    """dataclass with various evaluation arguments"""
 
     debug: bool = field(default=False)
     debug_text_only: bool = field(default=False)
@@ -56,9 +50,7 @@ class EvaluateCliArgs:
 
 @dataclass
 class ConvertDiffTransformerCliArgs:
-    """
-    dataclass with arguments for convert-diff-transformer CLI
-    """
+    """dataclass with arguments for convert-diff-transformer CLI"""
 
     debug: bool = field(default=False)
     zero_init: bool = field(default=False)

src/axolotl/integrations/diff_transformer/convert.py

@@ -98,9 +98,13 @@ def convert_module(module):
 
         # Iterate through module children, convert any attn layers to diff attn
         for name, child in module.named_children():
-            if isinstance(child, tuple(ATTENTION_MAPPING.keys())):
-                # Choose appropriate differential attention class
-                attention_class = ATTENTION_MAPPING[type(child)]
+            child_class_name = type(child).__name__
+            if child_class_name in [k.__name__ for k in ATTENTION_MAPPING]:
+                # Find matching attention class by name
+                for orig_class, diff_class in ATTENTION_MAPPING.items():
+                    if orig_class.__name__ == child_class_name:
+                        attention_class = diff_class
+                        break
 
                 layer_type = type(child).__name__
                 logger.info(

src/axolotl/integrations/diff_transformer/diff_attn.py

@@ -21,7 +21,6 @@
 
 
 def repeat_kv(x: torch.Tensor, n_rep: int) -> torch.Tensor:
-    """torch.repeat_interleave(x, dim=1, repeats=n_rep)"""
     batch_size, n_kv_heads, slen, head_dim = x.shape
     if n_rep == 1:
         return x
@@ -249,6 +248,7 @@ def forward(
 class LlamaDifferentialSdpaAttention(DifferentialAttentionBase):
     """SDPA-based implementation of differential attention."""
 
+    # pylint: disable=duplicate-code
     def forward(
         self,
         hidden_states: torch.Tensor,
@@ -312,6 +312,7 @@ def forward(
 class LlamaDifferentialFlashAttention2(DifferentialAttentionBase):
     """Flash Attention 2-based implementation of differential attention."""
 
+    # pylint: disable=duplicate-code
     def forward(
         self,
         hidden_states: torch.Tensor,

src/axolotl/utils/yaml.py

@@ -84,6 +84,11 @@ class OrderedDumper(yaml.SafeDumper):
     """Custom YAML dumper that maintains dictionary order."""
 
 
+def represent_none(self, _):
+    """Represent None values as empty fields."""
+    return self.represent_scalar("tag:yaml.org,2002:null", "")
+
+
 def ordered_dict_representer(dumper: OrderedDumper, data: Dict) -> Any:
     """Custom representer for dictionaries that maintains order."""
     return dumper.represent_mapping("tag:yaml.org,2002:map", data.items())
@@ -121,7 +126,8 @@ def dump_yaml_preserved_order(
     # Reorder the data
     ordered_data = reorder_dict(data, tracker.structure)
 
-    # Register the custom representer
+    # Register the custom representers
+    OrderedDumper.add_representer(type(None), represent_none)
     OrderedDumper.add_representer(dict, ordered_dict_representer)
     OrderedDumper.add_representer(OrderedDict, ordered_dict_representer)
 

tests/e2e/integrations/convert_diff_transformer/conftest.py

@@ -4,7 +4,7 @@
 from click.testing import CliRunner
 
 
-@pytest.fixture()
+@pytest.fixture(scope="class")
 def base_config():
     """Basic config for testing."""
     return {
@@ -26,6 +26,6 @@ def base_config():
     }
 
 
-@pytest.fixture
+@pytest.fixture(scope="class")
 def cli_runner():
     return CliRunner()