406 lines
17 KiB
Python
406 lines
17 KiB
Python
"""
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Universal model mixin for every model class the toolkit touches (transformers,
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unets, text encoders, VAEs, ...).
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OstrisModelMixin gives a model class one loading entry point, `load_model`, that
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digests any of:
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- a local diffusers checkpoint directory (the model folder itself or a full
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checkpoint that contains it under `aitk_subfolder`)
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- a HuggingFace repo id ("org/repo")
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- a local single .safetensors file in the model's original key layout
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- a remote single .safetensors file ("org/repo/path/file.safetensors")
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plus optional automatic quantization of the loaded weights (`qtype=...`). A
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single-file checkpoint carrying ComfyUI `comfy_quant` markers loads with its
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pre-quantized layers attached to the toolkit's quantization backends
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(convrot8 / nvfp4) automatically. `save_model` writes a single-file
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.safetensors back in the original (comfy) key layout.
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Model specific behavior lives in small overridable hooks (key conversion, config
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source, block names, backend loading), so subclassing for a new model usually means
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setting the `aitk_*` class attrs and overriding one or two hooks. The default
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backend hooks (`aitk_from_pretrained` / `aitk_load_config` / `aitk_from_config`)
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speak the diffusers ModelMixin API; transformers-lib models (text encoders) override
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those three to speak PreTrainedModel/AutoConfig instead.
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"""
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import os
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from typing import Dict, List, Optional
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import torch
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from huggingface_hub import hf_hub_download
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from safetensors.torch import load_file
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from tqdm import tqdm
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from diffusers.configuration_utils import ConfigMixin
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from diffusers.loaders import FromOriginalModelMixin, PeftAdapterMixin
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from diffusers.models.modeling_utils import ModelMixin
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from toolkit.basic import flush
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class BasicModel(ModelMixin, ConfigMixin, PeftAdapterMixin, FromOriginalModelMixin):
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pass
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class OstrisModelMixin:
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# ---- per-model configuration, override in subclasses ----
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# subfolder that holds this model inside a diffusers style checkpoint
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# (e.g. "transformer", "text_encoder", "vae")
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aitk_subfolder: Optional[str] = None
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# hub repo (or local path) to pull the model config from when loading a single
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# .safetensors file and no config_path is given
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aitk_config_repo: Optional[str] = None
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# ---- comfy weight sources (Phase 2 flips the loading default to these) ----
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# hub repo the comfy-format weight files are published in
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aitk_comfy_repo: Optional[str] = None
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# standard name_or_path (hub repo id) -> repo-relative comfy weight file
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# (ComfyUI folder layout: diffusion_models/, text_encoders/, vae/, ...)
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aitk_comfy_weight_names: Dict[str, str] = {}
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# ---- tokenizer/processor source, for text-encoder modules ----
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aitk_tokenizer_repo: Optional[str] = None
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aitk_tokenizer_subfolder: Optional[str] = None
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aitk_processor_repo: Optional[str] = None
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aitk_processor_subfolder: Optional[str] = None
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# ---- state set by the loader / quantizer ----
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aitk_is_quantized: bool = False
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aitk_qtype: Optional[str] = None
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# ------------------------------------------------------------------
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# extendable hooks
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# ------------------------------------------------------------------
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@classmethod
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def convert_state_dict_on_load(cls, state_dict: Dict[str, torch.Tensor]):
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"""Convert a single-file state dict from the model's original key layout to
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this class's layout. Default is a passthrough."""
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return state_dict
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@classmethod
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def convert_state_dict_on_save(cls, state_dict: Dict[str, torch.Tensor]):
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"""Convert this class's state dict back to the original single-file layout.
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Default is a passthrough."""
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return state_dict
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@classmethod
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def get_transformer_block_names(cls) -> Optional[List[str]]:
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"""Names (dotted paths allowed) of the repeated block lists to quantize one
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block at a time so the whole model never has to sit on the gpu at once."""
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return None
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@classmethod
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def get_quantization_exclude_modules(cls) -> Optional[List[str]]:
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"""fnmatch patterns of sensitive modules to keep in full precision."""
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return None
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# ---- backend hooks: default to the diffusers ModelMixin API. transformers-lib
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# models (text encoders) override these three to use PreTrainedModel/AutoConfig.
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@classmethod
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def aitk_from_pretrained(cls, path, subfolder=None, dtype=None, **kwargs):
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return cls.from_pretrained(
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path, subfolder=subfolder, torch_dtype=dtype, **kwargs
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)
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@classmethod
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def aitk_load_config(cls, path, subfolder=None):
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return cls.load_config(path, subfolder=subfolder)
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@classmethod
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def aitk_from_config(cls, config):
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with torch.device("meta"):
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return cls.from_config(config)
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# ------------------------------------------------------------------
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# loading
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# ------------------------------------------------------------------
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@classmethod
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def load_model(
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cls,
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name_or_path: str,
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dtype: torch.dtype = torch.bfloat16,
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device: Optional[torch.device] = None,
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qtype: Optional[str] = None,
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quantize_device: Optional[torch.device] = None,
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exclude_quant_modules: Optional[List[str]] = None,
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config_path: Optional[str] = None,
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subfolder: Optional[str] = None,
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**kwargs,
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):
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"""Load a model universally from a given name or path.
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name_or_path can be a local diffusers directory, a hub repo id, a local
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single .safetensors file, or a remote single file
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("org/repo/file.safetensors").
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qtype: quantize the weights after loading. quantize_device: where to run the
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quantization math; blocks are moved there one at a time and returned to where
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they were.
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config_path: config source for single-file loads, overriding aitk_config_repo.
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device: move the finished model there before returning.
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"""
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if subfolder is None:
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subfolder = cls.aitk_subfolder
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if name_or_path.endswith(".safetensors"):
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file_path = cls._resolve_single_file(name_or_path)
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model = cls._load_single_file(
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file_path, dtype=dtype, config_path=config_path, subfolder=subfolder
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)
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else:
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if os.path.isdir(name_or_path):
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# a local dir may be the model folder itself or a full checkpoint
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# that nests it under the subfolder
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if subfolder is not None and not os.path.isdir(
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os.path.join(name_or_path, subfolder)
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):
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subfolder = None
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model = cls.aitk_from_pretrained(
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name_or_path, subfolder=subfolder, dtype=dtype, **kwargs
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)
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if qtype is not None:
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model.quantize_(
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qtype, device=quantize_device, exclude=exclude_quant_modules
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)
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if device is not None:
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model.to(device)
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return model
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@staticmethod
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def _resolve_single_file(name_or_path: str) -> str:
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"""Resolve a .safetensors reference to a local file, downloading
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'org/repo/path/file.safetensors' hub references as needed."""
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if os.path.isfile(name_or_path):
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return name_or_path
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parts = name_or_path.split("/")
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if len(parts) < 3:
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raise ValueError(
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f"'{name_or_path}' is not a local file or a hub file reference "
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"('org/repo/filename.safetensors')."
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)
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return hf_hub_download(
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repo_id="/".join(parts[:2]), filename="/".join(parts[2:])
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)
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@classmethod
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def _load_single_file_config(
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cls, config_path: Optional[str], subfolder: Optional[str]
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):
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config_source = config_path if config_path is not None else cls.aitk_config_repo
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if config_source is None:
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raise ValueError(
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f"{cls.__name__} cannot load a single-file checkpoint without a "
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"config source; pass config_path or set aitk_config_repo."
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)
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if (
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subfolder is not None
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and os.path.isdir(config_source)
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and not os.path.isdir(os.path.join(config_source, subfolder))
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):
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subfolder = None
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return cls.aitk_load_config(config_source, subfolder=subfolder)
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@classmethod
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def _load_single_file(
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cls,
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file_path: str,
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dtype: torch.dtype,
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config_path: Optional[str] = None,
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subfolder: Optional[str] = None,
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):
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config = cls._load_single_file_config(config_path, subfolder)
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state_dict = load_file(file_path)
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state_dict = cls.convert_state_dict_on_load(state_dict)
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has_quant_markers = any(k.endswith(".comfy_quant") for k in state_dict)
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model = cls.aitk_from_config(config)
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if has_quant_markers:
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# pre-quantized comfy checkpoint: attach the quantized linears onto
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# the toolkit's backends, load the rest at its stored precision
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# (the checkpoint's bf16/fp16/fp32 mix is deliberate)
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from toolkit.util.comfy_quant_import import import_comfy_quantized_layers
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state_dict, num_quantized = import_comfy_quantized_layers(
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model, state_dict, orig_dtype=dtype
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)
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cls._load_state_dict_with_quantized(model, state_dict)
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model.aitk_is_quantized = True
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else:
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for key, value in state_dict.items():
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state_dict[key] = value.to(dtype=dtype)
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model.load_state_dict(state_dict, assign=True)
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model.to(dtype=dtype)
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del state_dict
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flush()
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return model
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@staticmethod
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def _load_state_dict_with_quantized(model, state_dict):
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"""Load a state dict onto a (meta-built) model whose quantized linears
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were already attached by import_comfy_quantized_layers: their weight
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(and importer-assigned bias) legitimately report as missing keys."""
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from toolkit.util.ostris_quant import OstrisLinear
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result = model.load_state_dict(state_dict, assign=True, strict=False)
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quantized_param_keys = set()
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for name, m in model.named_modules():
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if isinstance(m, OstrisLinear):
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quantized_param_keys.add(f"{name}.weight")
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if m.bias is not None:
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quantized_param_keys.add(f"{name}.bias")
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bad_missing = [k for k in result.missing_keys if k not in quantized_param_keys]
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if bad_missing or result.unexpected_keys:
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raise ValueError(
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f"{type(model).__name__} load mismatch: missing {bad_missing[:8]}, "
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f"unexpected {result.unexpected_keys[:8]}"
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)
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leftover_meta = [n for n, p in model.named_parameters() if p.is_meta]
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if leftover_meta:
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raise ValueError(
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f"{type(model).__name__} load left meta parameters: "
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f"{leftover_meta[:8]}"
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)
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# ------------------------------------------------------------------
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# comfy weight sources
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# ------------------------------------------------------------------
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@classmethod
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def find_comfy_weights(cls, name_or_path: str) -> Optional[str]:
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"""Local comfy-format weight file registered for a standard
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``name_or_path``, or None. Never downloads — Phase 2 flips the loading
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default to comfy sources; until then callers opt in explicitly."""
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from toolkit.models.v2.resolver import resolve_comfy_file
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rel_path = cls.aitk_comfy_weight_names.get(name_or_path)
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if rel_path is None:
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return None
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return resolve_comfy_file(
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rel_path, repo_id=cls.aitk_comfy_repo, local_only=True
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)
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# ------------------------------------------------------------------
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# tokenizer / processor (text-encoder modules)
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# ------------------------------------------------------------------
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@classmethod
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def load_tokenizer(cls, **kwargs):
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from transformers import AutoTokenizer
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if cls.aitk_tokenizer_repo is None:
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raise ValueError(f"{cls.__name__} does not declare aitk_tokenizer_repo")
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return AutoTokenizer.from_pretrained(
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cls.aitk_tokenizer_repo, subfolder=cls.aitk_tokenizer_subfolder, **kwargs
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)
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@classmethod
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def load_processor(cls, **kwargs):
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from transformers import AutoProcessor
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if cls.aitk_processor_repo is None:
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raise ValueError(f"{cls.__name__} does not declare aitk_processor_repo")
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return AutoProcessor.from_pretrained(
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cls.aitk_processor_repo, subfolder=cls.aitk_processor_subfolder, **kwargs
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)
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# ------------------------------------------------------------------
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# saving
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# ------------------------------------------------------------------
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@torch.no_grad()
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def save_model(
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self,
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output_path: str,
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dtype: Optional[torch.dtype] = None,
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metadata: Optional[Dict[str, str]] = None,
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):
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"""Save as a single-file .safetensors in the model's original (comfy)
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key layout, via convert_state_dict_on_save. Quantized weights are
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dequantized to full precision; dtype, when given, casts the floating
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point tensors. (Quantized-storage saves — comfy_quant markers — come
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with Phase 2.)"""
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from safetensors.torch import save_file
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from toolkit.util.quantize import dequantize_if_quantized
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state_dict = {}
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for key, value in self.state_dict().items():
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value = dequantize_if_quantized(value)
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if dtype is not None and value.is_floating_point():
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value = value.to(dtype=dtype)
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state_dict[key] = value.detach().to("cpu").contiguous()
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state_dict = self.convert_state_dict_on_save(state_dict)
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parent = os.path.dirname(output_path)
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if parent:
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os.makedirs(parent, exist_ok=True)
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save_file(state_dict, output_path, metadata=metadata)
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del state_dict
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flush()
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# ------------------------------------------------------------------
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# quantization
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# ------------------------------------------------------------------
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@torch.no_grad()
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def quantize_(
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self,
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qtype: str,
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device: Optional[torch.device] = None,
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exclude: Optional[List[str]] = None,
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):
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"""Quantize the model weights in place. When device is given, the repeated
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blocks (get_transformer_block_names) are moved there one at a time for the
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quantization math and returned to their original device, so the whole model
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never has to fit on the gpu in full precision."""
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from optimum.quanto import freeze
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from toolkit.dequantize import patch_dequantization_on_save
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from toolkit.util.quantize import get_qtype, quantize
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# make full-model saves emit plain full precision weights
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patch_dequantization_on_save(self)
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quantization_type = get_qtype(qtype)
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exclude = list(exclude or []) + list(
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self.get_quantization_exclude_modules() or []
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)
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blocks: List[torch.nn.Module] = []
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for name in self.get_transformer_block_names() or []:
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# name may be a dotted path for models that nest their blocks
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block_list = self
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for part in name.split("."):
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block_list = getattr(block_list, part, None)
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if block_list is None:
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break
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if block_list is not None:
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blocks += list(block_list)
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for block in tqdm(blocks, desc=f"Quantizing blocks ({qtype})"):
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first_param = next(block.parameters(), None)
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orig_device = first_param.device if first_param is not None else None
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if device is not None and orig_device is not None:
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block.to(device, non_blocking=True)
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quantize(block, weights=quantization_type)
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freeze(block)
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if device is not None and orig_device is not None:
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# NOT non_blocking: an async D2H allocates the cpu destination in pinned
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# memory, which the caching host allocator keeps forever (with power-of-2
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# bucket rounding on top) — that silently retained a model-sized chunk of
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# host ram after the weights moved back to the gpu for training
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block.to(orig_device)
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# everything the block pass did not cover (embedders, norms, projections, ...)
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quantize(self, weights=quantization_type, exclude=exclude)
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freeze(self)
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self.aitk_is_quantized = True
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self.aitk_qtype = qtype
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flush()
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return self
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