mirror of
https://github.com/anapnoe/stable-diffusion-webui-ux.git
synced 2026-09-19 01:05:13 +02:00
update to sdxl
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anapnoe
@@ -3,8 +3,31 @@ import open_clip
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import torch
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import transformers.utils.hub
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from modules import shared
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class DisableInitialization:
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class ReplaceHelper:
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def __init__(self):
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self.replaced = []
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def replace(self, obj, field, func):
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original = getattr(obj, field, None)
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if original is None:
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return None
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self.replaced.append((obj, field, original))
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setattr(obj, field, func)
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return original
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def restore(self):
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for obj, field, original in self.replaced:
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setattr(obj, field, original)
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self.replaced.clear()
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class DisableInitialization(ReplaceHelper):
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"""
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When an object of this class enters a `with` block, it starts:
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- preventing torch's layer initialization functions from working
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@@ -21,7 +44,7 @@ class DisableInitialization:
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"""
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def __init__(self, disable_clip=True):
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self.replaced = []
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super().__init__()
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self.disable_clip = disable_clip
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def replace(self, obj, field, func):
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@@ -86,8 +109,124 @@ class DisableInitialization:
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self.transformers_utils_hub_get_from_cache = self.replace(transformers.utils.hub, 'get_from_cache', transformers_utils_hub_get_from_cache)
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def __exit__(self, exc_type, exc_val, exc_tb):
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for obj, field, original in self.replaced:
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setattr(obj, field, original)
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self.restore()
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self.replaced.clear()
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class InitializeOnMeta(ReplaceHelper):
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"""
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Context manager that causes all parameters for linear/conv2d/mha layers to be allocated on meta device,
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which results in those parameters having no values and taking no memory. model.to() will be broken and
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will need to be repaired by using LoadStateDictOnMeta below when loading params from state dict.
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Usage:
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```
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with sd_disable_initialization.InitializeOnMeta():
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sd_model = instantiate_from_config(sd_config.model)
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```
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"""
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def __enter__(self):
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if shared.cmd_opts.disable_model_loading_ram_optimization:
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return
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def set_device(x):
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x["device"] = "meta"
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return x
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linear_init = self.replace(torch.nn.Linear, '__init__', lambda *args, **kwargs: linear_init(*args, **set_device(kwargs)))
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conv2d_init = self.replace(torch.nn.Conv2d, '__init__', lambda *args, **kwargs: conv2d_init(*args, **set_device(kwargs)))
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mha_init = self.replace(torch.nn.MultiheadAttention, '__init__', lambda *args, **kwargs: mha_init(*args, **set_device(kwargs)))
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self.replace(torch.nn.Module, 'to', lambda *args, **kwargs: None)
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def __exit__(self, exc_type, exc_val, exc_tb):
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self.restore()
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class LoadStateDictOnMeta(ReplaceHelper):
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"""
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Context manager that allows to read parameters from state_dict into a model that has some of its parameters in the meta device.
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As those parameters are read from state_dict, they will be deleted from it, so by the end state_dict will be mostly empty, to save memory.
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Meant to be used together with InitializeOnMeta above.
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Usage:
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```
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with sd_disable_initialization.LoadStateDictOnMeta(state_dict):
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model.load_state_dict(state_dict, strict=False)
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```
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"""
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def __init__(self, state_dict, device, weight_dtype_conversion=None):
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super().__init__()
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self.state_dict = state_dict
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self.device = device
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self.weight_dtype_conversion = weight_dtype_conversion or {}
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self.default_dtype = self.weight_dtype_conversion.get('')
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def get_weight_dtype(self, key):
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key_first_term, _ = key.split('.', 1)
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return self.weight_dtype_conversion.get(key_first_term, self.default_dtype)
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def __enter__(self):
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if shared.cmd_opts.disable_model_loading_ram_optimization:
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return
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sd = self.state_dict
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device = self.device
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def load_from_state_dict(original, module, state_dict, prefix, *args, **kwargs):
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used_param_keys = []
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for name, param in module._parameters.items():
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if param is None:
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continue
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key = prefix + name
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sd_param = sd.pop(key, None)
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if sd_param is not None:
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state_dict[key] = sd_param.to(dtype=self.get_weight_dtype(key))
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used_param_keys.append(key)
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if param.is_meta:
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dtype = sd_param.dtype if sd_param is not None else param.dtype
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module._parameters[name] = torch.nn.parameter.Parameter(torch.zeros_like(param, device=device, dtype=dtype), requires_grad=param.requires_grad)
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for name in module._buffers:
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key = prefix + name
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sd_param = sd.pop(key, None)
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if sd_param is not None:
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state_dict[key] = sd_param
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used_param_keys.append(key)
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original(module, state_dict, prefix, *args, **kwargs)
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for key in used_param_keys:
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state_dict.pop(key, None)
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def load_state_dict(original, module, state_dict, strict=True):
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"""torch makes a lot of copies of the dictionary with weights, so just deleting entries from state_dict does not help
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because the same values are stored in multiple copies of the dict. The trick used here is to give torch a dict with
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all weights on meta device, i.e. deleted, and then it doesn't matter how many copies torch makes.
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In _load_from_state_dict, the correct weight will be obtained from a single dict with the right weights (sd).
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The dangerous thing about this is if _load_from_state_dict is not called, (if some exotic module overloads
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the function and does not call the original) the state dict will just fail to load because weights
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would be on the meta device.
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"""
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if state_dict == sd:
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state_dict = {k: v.to(device="meta", dtype=v.dtype) for k, v in state_dict.items()}
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original(module, state_dict, strict=strict)
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module_load_state_dict = self.replace(torch.nn.Module, 'load_state_dict', lambda *args, **kwargs: load_state_dict(module_load_state_dict, *args, **kwargs))
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module_load_from_state_dict = self.replace(torch.nn.Module, '_load_from_state_dict', lambda *args, **kwargs: load_from_state_dict(module_load_from_state_dict, *args, **kwargs))
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linear_load_from_state_dict = self.replace(torch.nn.Linear, '_load_from_state_dict', lambda *args, **kwargs: load_from_state_dict(linear_load_from_state_dict, *args, **kwargs))
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conv2d_load_from_state_dict = self.replace(torch.nn.Conv2d, '_load_from_state_dict', lambda *args, **kwargs: load_from_state_dict(conv2d_load_from_state_dict, *args, **kwargs))
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mha_load_from_state_dict = self.replace(torch.nn.MultiheadAttention, '_load_from_state_dict', lambda *args, **kwargs: load_from_state_dict(mha_load_from_state_dict, *args, **kwargs))
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layer_norm_load_from_state_dict = self.replace(torch.nn.LayerNorm, '_load_from_state_dict', lambda *args, **kwargs: load_from_state_dict(layer_norm_load_from_state_dict, *args, **kwargs))
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group_norm_load_from_state_dict = self.replace(torch.nn.GroupNorm, '_load_from_state_dict', lambda *args, **kwargs: load_from_state_dict(group_norm_load_from_state_dict, *args, **kwargs))
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def __exit__(self, exc_type, exc_val, exc_tb):
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self.restore()
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