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"""
Base framework abstraction providing:
- Pretrained loading (config + normalization stats + weights)
- Action space utilities (dimension, stats, (un)normalization)
- Trainable module discovery helper
Note: No device placement or optimizer concerns handled here (delegated to trainer).
"""
import importlib
import pkgutil
from pathlib import Path
from typing import Any, Dict, List
import numpy as np
import torch
from transformers import PretrainedConfig, PreTrainedModel
from starVLA.model.framework.share_tools import dict_to_namespace, read_mode_config
from starVLA.model.tools import FRAMEWORK_REGISTRY, FrameworkTools, auto_get_trainable_modules
from starVLA.training.trainer_utils import initialize_overwatch
logger = initialize_overwatch(__name__)
_FRAMEWORKS_IMPORTED = False
_FRAMEWORK_IMPORT_ERRORS: dict[str, str] = {}
_OPTIONAL_EXTERNAL_MODULES = {"qwen_vl_utils"}
def _import_optional_framework(module_path: str) -> None:
"""Import a framework plugin without making unrelated extras mandatory."""
try:
importlib.import_module(module_path)
except ModuleNotFoundError as exc:
missing_root = (exc.name or "").split(".", 1)[0]
if missing_root not in _OPTIONAL_EXTERNAL_MODULES:
raise
_FRAMEWORK_IMPORT_ERRORS[module_path] = str(exc)
logger.warning("Skipping optional framework %s: %s", module_path, exc)
def _auto_import_framework_modules() -> None:
global _FRAMEWORKS_IMPORTED
if _FRAMEWORKS_IMPORTED:
return
_SKIP = {"__init__", "base_framework", "share_tools"}
framework_dir = Path(__file__).resolve().parent
# Scan top-level modules (backwards compat)
for _, module_name, is_pkg in pkgutil.iter_modules([str(framework_dir)]):
if module_name in _SKIP:
continue
if is_pkg:
# Scan sub-packages (VLM4A/, WM4A/, etc.)
sub_dir = framework_dir / module_name
for _, sub_name, _ in pkgutil.iter_modules([str(sub_dir)]):
if sub_name.startswith("_"):
continue
_import_optional_framework(
f"starVLA.model.framework.{module_name}.{sub_name}"
)
else:
_import_optional_framework(f"starVLA.model.framework.{module_name}")
_FRAMEWORKS_IMPORTED = True
def build_framework(cfg): # The single entry point for building different model frameworks
"""
Build a framework model from config.
Args:
cfg: Config object containing `cfg.framework.name`.
Returns:
nn.Module: Instantiated framework model.
"""
if not hasattr(cfg, "framework") or not hasattr(cfg.framework, "name"):
raise ValueError("Missing `cfg.framework.name`. The framework API now only accepts `framework.name`.")
_auto_import_framework_modules()
framework_id = cfg.framework.name
if framework_id not in FRAMEWORK_REGISTRY._registry:
available = sorted(FRAMEWORK_REGISTRY._registry.keys())
skipped = "; ".join(
f"{module}: {error}"
for module, error in sorted(_FRAMEWORK_IMPORT_ERRORS.items())
)
raise NotImplementedError(
f"Framework `{framework_id}` is not implemented. Available frameworks: {available}. "
f"Skipped optional frameworks: {skipped or 'none'}"
)
model_class = FRAMEWORK_REGISTRY[framework_id]
return model_class(cfg)
# PreTrainedModel, AutoModel, PretrainedConfig, are so good, find sometime to study them
# Framework construction merges the YAML and transformer configurations.
class baseframework(PreTrainedModel):
"""
Lightweight base class for higher-level VLA model assemblies.
Subclasses are expected to:
- Accept a structured config
- Register components in __init__
- Use provided helpers for action normalization handling
"""
def __init__(self, hf_config=PretrainedConfig()) -> None:
"""
Initialize base nn.Module. Subclasses add components.
"""
super().__init__(hf_config)
# ------------------------------------------------------------------
# Soft-constraint interface: subclasses should override these.
# Default implementations raise NotImplementedError so that IDE
# tooling (e.g. pylance, mypy) flags missing overrides, while
# still allowing PreTrainedModel instantiation (no ABC).
# ------------------------------------------------------------------
def forward(self, examples: List[dict], **kwargs) -> dict:
"""Training forward pass.
Args:
examples: List[dict], each dict requires at least:
- image: List[PIL.Image]
- lang: str
- action: np.ndarray shaped [T, action_dim]
Returns:
dict: Must contain ``"action_loss"`` (torch.Tensor scalar).
May contain extra keys for logging (e.g. ``"kl_loss"``).
"""
raise NotImplementedError(
f"{type(self).__name__} must implement forward(examples) -> dict with 'action_loss' key."
)
def predict_action(self, examples: List[dict], **kwargs) -> dict:
"""Inference: predict future actions from observations.
Args:
examples: Same schema as *forward* (minus ``action`` which is optional).
**kwargs: Framework-specific inference options (e.g. ``use_ddim``).
Returns:
dict: Must contain ``"normalized_actions"`` (np.ndarray [B, T, action_dim]).
"""
raise NotImplementedError(
f"{type(self).__name__} must implement predict_action(examples) -> dict with 'normalized_actions' key."
)
# ------------------------------------------------------------------
# Unified loss interface for Trainer
# ------------------------------------------------------------------
def supports_training_tag(self, tag: str) -> bool:
"""Return whether this framework can consume batches for *tag*."""
if tag == "vla":
return type(self).forward is not baseframework.forward
if tag == "vlm":
return hasattr(self, "qwen_vl_interface") or type(self).forward_vlm is not baseframework.forward_vlm
return False
def compute_loss(self, tag: str, batch, loss_scale: dict = None) -> Dict[str, torch.Tensor] | None:
"""Unified forward entry-point: route to the right forward by *tag*.
The trainer calls ``model.compute_loss(tag, batch)`` for every
``(tag, batch)`` pair produced by :class:`DataLoaderManager`.
The model internally dispatches:
- ``"vla"`` → ``self.forward(batch)``
- ``"vlm"`` → ``self.forward_vlm(batch)``
Subclasses can override this to add more tags (e.g. ``"world"``).
Args:
tag: dataset type tag (``"vla"``, ``"vlm"``, …)
batch: the batch produced by the corresponding DataLoader.
loss_scale: ``{"vla": 1.0, "vlm": 0.1}`` per-tag loss multiplier.
Defaults to 1.0 for unspecified tags.
Returns:
dict[str, Tensor] | None: keyed losses (e.g. ``{"action_loss": ...}``).
Returns ``None`` when this framework does not support the
incoming dataloader tag so the trainer can ``continue``.
"""
if not self.supports_training_tag(tag):
return None
scale = (loss_scale or {}).get(tag, 1.0)
if tag == "vla":
out = self.forward(batch)
elif tag == "vlm":
out = self.forward_vlm(batch)
else:
return None
# Apply loss scale and filter to Tensor values only
return {k: v * scale for k, v in out.items() if isinstance(v, torch.Tensor)}
def forward_vlm(self, batch) -> Dict[str, torch.Tensor]:
"""VLM forward pass (default implementation).
Delegates to ``self.qwen_vl_interface(**batch)`` which is present on
every framework subclass that uses a Qwen VL backbone.
Subclasses may override to add custom VLM logic.
Args:
batch: dict produced by the VLM dataloader.
Returns:
dict: Must contain ``"vlm_loss"`` (torch.Tensor scalar).
"""
if not hasattr(self, "qwen_vl_interface"):
raise NotImplementedError(
f"{type(self).__name__} has no `qwen_vl_interface`. "
"Override forward_vlm() to support VLM training."
)
out = self.qwen_vl_interface(**batch)
return {"vlm_loss": out.loss}
@classmethod
def from_pretrained(
cls,
pretrained_checkpoint: str,
**kwargs,
) -> None:
"""
Restore a model instance from a saved checkpoint.
Workflow:
1. Resolve checkpoint path
2. Load config + dataset normalization statistics
3. Build model with loaded config
4. Load state_dict strictly (reports missing/unexpected keys)
5. Attach normalization stats for later un-normalization
Args:
pretrained_checkpoint: Path to .pt file inside run/checkpoints directory.
**kwargs: Extra constructor overrides passed to subclass.
Returns:
baseframework: Instantiated model (left on CPU; caller decides device).
Raises:
RuntimeError: If state_dict key mismatch occurs under strict=True.
FileNotFoundError: If underlying files are missing (surfaced earlier).
"""
pretrained_checkpoint = Path(pretrained_checkpoint)
model_config, norm_stats = read_mode_config(pretrained_checkpoint) # read config and norm_stats
config = dict_to_namespace(model_config)
model_config = config
model_config.trainer.pretrained_checkpoint = None
FrameworkModel = build_framework(cfg=model_config)
# set for action un-norm
FrameworkModel.norm_stats = norm_stats
# Load from Checkpoint (Custom --> should load both *projector* and *llm* weights)
if pretrained_checkpoint.suffix == ".safetensors":
from safetensors.torch import load_file
model_state_dict = load_file(str(pretrained_checkpoint))
else:
model_state_dict = torch.load(pretrained_checkpoint, map_location="cpu")
# logger.info(f"Loading model weights from `{pretrained_checkpoint}`")
model_keys = set(FrameworkModel.state_dict().keys())
checkpoint_keys = set(model_state_dict.keys())
try:
FrameworkModel.load_state_dict(model_state_dict, strict=True)
except RuntimeError as e:
# must keep all keys matched
common_keys = model_keys.intersection(checkpoint_keys)
missing_keys = model_keys - common_keys
unexpected_keys = checkpoint_keys - common_keys
if missing_keys:
logger.warning(f"Missing keys in state_dict: {missing_keys}")
if unexpected_keys:
logger.warning(f"Unexpected keys in state_dict: {unexpected_keys}")
raise e
# **ensure model is on GPU**
FrameworkModel = FrameworkModel
return FrameworkModel
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