In `@src/megatron/bridge/models/__init__.py`:
- Around line 16-22: Add the missing export for BailingMoeV2Bridge to the
module's public API: update the __all__ list in
src/megatron/bridge/models/__init__.py to include "BailingMoeV2Bridge"
(alongside the already-exported GLM45Bridge, OlMoEBridge, NemotronBridge, and
the provider names Ling1TModelProvider, LingFlash2ModelProvider,
LingMini2ModelProvider) so the imported symbol is actually exported and the
Flake8 F401 is resolved.

In `@src/megatron/bridge/models/bailing/bailing_moe2_bridge.py`:
- Around line 56-62: Fix the typo in the module docstring: change "AutoBrige" to
"AutoBridge" in the example block so the class name matches the actual symbol;
update the docstring in bailing_moe2_bridge.py (the example that references
AutoBrige -> AutoBridge) to ensure the usage snippet correctly references
AutoBridge.

In `@src/megatron/bridge/models/bailing/bailing_moe2_provider.py`:
- Line 58: The variable init_method_std is annotated as int but assigned 0.02;
update its type hint to float (e.g., change init_method_std: int = 0.02 to
init_method_std: float = 0.02) in the BailingMoe2Provider (or the scope where
init_method_std is defined) and run a quick search for other uses or annotations
referencing init_method_std to ensure they expect a float and adjust any
docstrings or tests accordingly.
- Around line 59-73: Remove the duplicate attention_dropout field in the
dataclass: locate both occurrences of the attention_dropout attribute (the one
near the top with other config fields and the second one just above kv_channels)
and delete one so the dataclass only declares attention_dropout once (retain the
intended value, e.g., 0.0). Ensure there are no other duplicate config fields
introduced nearby (e.g., kv_channels) and run a quick lint/type-check to confirm
no references rely on the removed duplicate.

In `@tests/functional_tests/models/bailing/test_bailing_moe2_conversion.py`:
- Around line 160-164: The test currently overwrites the config.json written by
model.save_pretrained(), losing model-generated metadata like auto_map and the
serialized torch_dtype; instead, load the file that model.save_pretrained()
produced (config_path), parse it, merge in only the missing/desired fields from
HF_BAILING_MOE2_TOY_MODEL_CONFIG (or skip the overwrite entirely), and write the
merged config back so fields such as auto_map and the model's serialized
torch_dtype remain intact; reference model.save_pretrained, config_to_save,
HF_BAILING_MOE2_TOY_MODEL_CONFIG and config_path to locate and change the logic.
- Around line 130-133: Remove the debug print in the loop that inspects the
model dtype (the for name, param in model.named_parameters(): print(...) break
block); either delete the print entirely or replace it with the standardized
non-duplicating logger (use print_rank_0 or logging.debug) so tests don't emit
raw prints across ranks—locate the snippet referencing model.named_parameters()
in the test and swap the print for print_rank_0(f"Before save - {name}:
{param.dtype}") or remove the block.
- Around line 108-126: The fallback in the except block currently calls
AutoModelForCausalLM.from_pretrained("inclusionAI/Ling-mini-2.0", ...) which
downloads a huge model to register the class; replace that heavy fallback by
either calling AutoConfig.from_pretrained("inclusionAI/Ling-mini-2.0",
trust_remote_code=True) to fetch only the config and remote code (so
AutoModelForCausalLM.from_config(config, trust_remote_code=True) can succeed) or
skip the test immediately with pytest.skip if class registration fails; update
the block around AutoModelForCausalLM.from_pretrained,
AutoModelForCausalLM.from_config, and pytest.skip to use
AutoConfig.from_pretrained or direct pytest.skip instead of downloading the full
model.
- Around line 311-314: The test currently hardcodes /opt/Megatron-Bridge/ in the
coverage args which breaks non-CI environments; update the arguments to derive
the paths from the repo root already computed as cwd (or from Path(__file__)),
e.g. replace "--data-file=/opt/Megatron-Bridge/.coverage" with "--data-file=" +
str(cwd / ".coverage") and replace "--source=/opt/Megatron-Bridge/" with
"--source=" + str(cwd) so the coverage data file and source path are computed
dynamically (refer to the cwd variable computed in this test file).