''' This is a MODIFIED version of arrmansa's low VRAM patch. https://github.com/arrmansa/Basic-UI-for-GPT-J-6B-with-low-vram/blob/main/GPT-J-6B-Low-Vram-UI.ipynb The ORIGINAL version of the patch is released under the Apache License 2.0 Copyright 2021 arrmansa Copyright 2021 finetuneanon Copyright 2018 The Hugging Face team Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. Definitions. "License" shall mean the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 of this document. "Licensor" shall mean the copyright owner or entity authorized by the copyright owner that is granting the License. "Legal Entity" shall mean the union of the acting entity and all other entities that control, are controlled by, or are under common control with that entity. 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''' import torch from torch import nn import torch.cuda.comm import copy import gc import sys import itertools import bisect import random from typing import Optional from transformers.modeling_outputs import BaseModelOutputWithPast, BaseModelOutputWithPastAndCrossAttentions from transformers.utils import logging logger = logging.get_logger(__name__) breakmodel = True gpu_blocks = [] primary_device = 0 # Copied from transformers.models.bart.modeling_bart._expand_mask def _expand_mask(mask: torch.Tensor, dtype: torch.dtype, tgt_len: Optional[int] = None): """ Expands attention_mask from `[bsz, seq_len]` to `[bsz, 1, tgt_seq_len, src_seq_len]`. """ bsz, src_len = mask.size() tgt_len = tgt_len if tgt_len is not None else src_len expanded_mask = mask[:, None, None, :].expand(bsz, 1, tgt_len, src_len).to(dtype) inverted_mask = 1.0 - expanded_mask return inverted_mask.masked_fill(inverted_mask.bool(), torch.finfo(dtype).min) def move_hidden_layers(transformer, h=None): if h is None: h = transformer.h assert len(gpu_blocks) <= torch.cuda.device_count() assert sum(gpu_blocks) <= len(h) ram_blocks = len(h) - sum(gpu_blocks) transformer.extrastorage = {} torch.cuda.empty_cache() able_to_pin_layers = True for i in range(ram_blocks): h[i].to("cpu") transformer.extrastorage[i] = copy.deepcopy(h[i]) smalltensor = torch.tensor(0).to(primary_device) for param1 in h[i].parameters(): param1.data = smalltensor h[i].to(primary_device) for param in transformer.extrastorage[i].parameters(): param.requires_grad = False param.data = param.data.detach() if able_to_pin_layers: try: param.data = param.data.pin_memory() except: able_to_pin_layers = False print(f"WARNING: You only have enough shared GPU memory for {i} out of {ram_blocks} CPU layers. Expect suboptimal speed.", file=sys.stderr) gc.collect() torch.cuda.empty_cache() if ram_blocks: for param1,param2 in zip(h[0].parameters(),transformer.extrastorage[0].parameters()): param1.data = param2.data.to(primary_device, non_blocking=False).detach() for param1,param2 in zip(h[ram_blocks-1].parameters(),transformer.extrastorage[ram_blocks-1].parameters()): param1.data = param2.data.to(primary_device, non_blocking=False).detach() i = ram_blocks for j in range(len(gpu_blocks)): for _ in range(gpu_blocks[j]): h[i].to(j) i += 1 def new_forward_neo( self, input_ids=None, past_key_values=None, attention_mask=None, token_type_ids=None, position_ids=None, head_mask=None, inputs_embeds=None, use_cache=None, output_attentions=None, output_hidden_states=None, return_dict=None, embs=None, ): assert len(gpu_blocks) <= torch.cuda.device_count() assert sum(gpu_blocks) <= len(self.h) ram_blocks = len(self.h) - sum(gpu_blocks) cumulative_gpu_blocks = tuple(itertools.accumulate(gpu_blocks)) output_attentions = output_attentions if output_attentions is not None else self.config.output_attentions output_hidden_states = ( output_hidden_states if output_hidden_states is not None else self.config.output_hidden_states ) use_cache = use_cache if use_cache is not None else self.config.use_cache return_dict = return_dict if return_dict is not None else self.config.use_return_dict if input_ids is not None and inputs_embeds is not None: raise ValueError("You cannot specify both input_ids and inputs_embeds at the same time") elif input_ids is not None: input_shape = input_ids.size() input_ids = input_ids.view(-1, input_shape[-1]) batch_size = input_ids.shape[0] elif inputs_embeds is not None: input_shape = inputs_embeds.size()[:-1] batch_size = inputs_embeds.shape[0] else: raise ValueError("You have to specify either input_ids or inputs_embeds") device = input_ids.device if input_ids is not None else inputs_embeds.device if token_type_ids is not None: token_type_ids = token_type_ids.view(-1, input_shape[-1]) if position_ids is not None: position_ids = position_ids.view(-1, input_shape[-1]) if past_key_values is None: past_length = 0 past_key_values = tuple([None] * len(self.h)) else: past_length = past_key_values[0][0].size(-2) device = primary_device if breakmodel else input_ids.device if input_ids is not None else inputs_embeds.device if position_ids is None: position_ids = torch.arange(past_length, input_shape[-1] + past_length, dtype=torch.long, device=device) position_ids = position_ids.unsqueeze(0).view(-1, input_shape[-1]) # Attention mask. if attention_mask is not None: assert batch_size > 0, "batch_size has to be defined and > 0" attention_mask = attention_mask.view(batch_size, -1) # We create a 3D attention mask from a 2D tensor mask. # Sizes are [batch_size, 1, 1, to_seq_length] # So we can broadcast to [batch_size, num_heads, from_seq_length, to_seq_length] # this attention mask is more simple than the triangular masking of causal attention # used in OpenAI GPT, we just need to prepare the broadcast dimension here. attention_mask = attention_mask[:, None, None, :] # Since attention_mask is 1.0 for positions we want to attend and 0.0 for # masked positions, this operation will create a tensor which is 0.0 for # positions we want to attend and -10000.0 for masked positions. # Since we are adding it to the raw scores before the softmax, this is # effectively the same as removing these entirely. attention_mask = attention_mask.to(dtype=self.dtype) # fp16 compatibility attention_mask = (1.0 - attention_mask) * -10000.0 # Prepare head mask if needed # 1.0 in head_mask indicate we keep the head # attention_probs has shape bsz x num_heads x N x N # head_mask has shape n_layer x batch x num_heads x N x N head_mask = self.get_head_mask(head_mask, getattr(self.config, "num_layers", None) or self.config.n_layer) if inputs_embeds is None: if breakmodel: input_ids = input_ids.to(primary_device) inputs_embeds = self.wte(input_ids) if embs is not None and not (use_cache is not None and use_cache and past_key_values is not None and len(past_key_values) > 0 and past_key_values[0] is not None): offset = 0 for pos, emb in embs: pos += offset if len(emb.shape) == 2: emb = emb.repeat(input_shape[0], 1, 1) inputs_embeds[:, pos:pos+emb.shape[1]] = emb offset += emb.shape[1] if getattr(self, "wpe", None) is None: hidden_states = inputs_embeds else: if breakmodel: position_ids = position_ids.to(primary_device) position_embeds = self.wpe(position_ids) if breakmodel: position_embeds = position_embeds.to(primary_device) hidden_states = inputs_embeds + position_embeds if token_type_ids is not None: token_type_embeds = self.wte(token_type_ids) hidden_states = hidden_states + token_type_embeds hidden_states = self.drop(hidden_states) output_shape = input_shape + (hidden_states.size(-1),) presents = () if use_cache else None all_self_attentions = () if output_attentions else None all_hidden_states = () if output_hidden_states else None if breakmodel and ram_blocks: copystream = torch.cuda.Stream(device=primary_device, priority=-1) for i, (block, layer_past) in enumerate(zip(self.h, past_key_values)): if breakmodel: if i in range(ram_blocks): index1 = (i+1)%ram_blocks for param1,param2 in zip(self.h[index1].parameters(),self.h[(i-1)%ram_blocks].parameters()): param1.data = param2.data for param1,param2 in zip(self.h[index1].parameters(),self.extrastorage[index1].parameters()): with torch.cuda.stream(copystream): torch.cuda.comm.broadcast(param2.data,out = [param1.data]) if output_hidden_states: all_hidden_states = all_hidden_states + (hidden_states.cpu(),) if getattr(self.config, "gradient_checkpointing", False) and self.training: if use_cache: logger.warning( "`use_cache=True` is incompatible with gradient checkpointing. Setting `use_cache=False`..." ) use_cache = False def create_custom_forward(module): def custom_forward(*inputs): # None for past_key_value return module(*inputs, use_cache, output_attentions) return custom_forward outputs = torch.utils.checkpoint.checkpoint( create_custom_forward(block), hidden_states, None, attention_mask, head_mask[i], ) else: if breakmodel: device = primary_device if i < ram_blocks else bisect.bisect_right(cumulative_gpu_blocks, i - ram_blocks) outputs = block( hidden_states.to(device) if breakmodel and hidden_states is not None else hidden_states, layer_past=tuple(v.to(device) for v in layer_past if v is not None) if breakmodel and layer_past is not None and i >= ram_blocks and len(layer_past) and layer_past[0].device.index != device else layer_past, attention_mask=attention_mask.to(device) if breakmodel and attention_mask is not None else attention_mask, head_mask=head_mask[i].to(device) if breakmodel and head_mask[i] is not None else head_mask[i], use_cache=use_cache, output_attentions=output_attentions, ) hidden_states = outputs[0] if use_cache is True: presents = presents + (outputs[1],) if output_attentions: all_self_attentions = all_self_attentions + (outputs[2 if use_cache else 1],) if breakmodel: if i in range(ram_blocks): torch.cuda.synchronize() torch.cuda.empty_cache() if breakmodel: if ram_blocks: del copystream torch.cuda.empty_cache() hidden_states = hidden_states.to(primary_device) hidden_states = self.ln_f(hidden_states) if breakmodel: hidden_states = hidden_states.to(primary_device) hidden_states = hidden_states.view(*output_shape) # Add last hidden state if output_hidden_states: all_hidden_states = all_hidden_states + (hidden_states,) if not return_dict: return tuple(v for v in [hidden_states, presents, all_hidden_states, all_self_attentions] if v is not None) return BaseModelOutputWithPast( last_hidden_state=hidden_states, past_key_values=presents, hidden_states=all_hidden_states, attentions=all_self_attentions, ) def new_forward_xglm( self, input_ids=None, attention_mask=None, encoder_hidden_states=None, encoder_attention_mask=None, head_mask=None, cross_attn_head_mask=None, past_key_values=None, inputs_embeds=None, use_cache=None, output_attentions=None, output_hidden_states=None, return_dict=None, ): assert len(gpu_blocks) <= torch.cuda.device_count() assert sum(gpu_blocks) <= len(self.layers) ram_blocks = len(self.layers) - sum(gpu_blocks) cumulative_gpu_blocks = tuple(itertools.accumulate(gpu_blocks)) output_attentions = output_attentions if output_attentions is not None else self.config.output_attentions output_hidden_states = ( output_hidden_states if output_hidden_states is not None else self.config.output_hidden_states ) use_cache = use_cache if use_cache is not None else self.config.use_cache return_dict = return_dict if return_dict is not None else self.config.use_return_dict # retrieve input_ids and inputs_embeds if input_ids is not None and inputs_embeds is not None: raise ValueError("You cannot specify both input_ids and inputs_embeds at the same time") elif input_ids is not None: input_shape = input_ids.size() input_ids = input_ids.view(-1, input_shape[-1]) elif inputs_embeds is not None: input_shape = inputs_embeds.size()[:-1] else: raise ValueError("You have to specify either input_ids or inputs_embeds") # past_key_values_length past_key_values_length = past_key_values[0][0].shape[2] if past_key_values is not None else 0 if inputs_embeds is None: if breakmodel: input_ids = input_ids.to(primary_device) inputs_embeds = self.embed_tokens(input_ids) * self.embed_scale attention_mask = self._prepare_decoder_attention_mask( attention_mask, input_shape, inputs_embeds, past_key_values_length ) # expand encoder attention mask if encoder_hidden_states is not None and encoder_attention_mask is not None: # [bsz, seq_len] -> [bsz, 1, tgt_seq_len, src_seq_len] encoder_attention_mask = _expand_mask(encoder_attention_mask, inputs_embeds.dtype, tgt_len=input_shape[-1]) # embed positions if breakmodel: inputs_embeds = inputs_embeds.to(primary_device) positions = self.embed_positions(input_ids, inputs_embeds, past_key_values_length) if breakmodel: positions = positions.to(primary_device) hidden_states = inputs_embeds + positions hidden_states = nn.functional.dropout(hidden_states, p=self.dropout, training=self.training) # decoder layers all_hidden_states = () if output_hidden_states else None all_self_attns = () if output_attentions else None all_cross_attentions = () if (output_attentions and encoder_hidden_states is not None) else None next_decoder_cache = () if use_cache else None if breakmodel and ram_blocks: copystream = torch.cuda.Stream(device=primary_device, priority=-1) # check if head_mask/cross_attn_head_mask has a correct number of layers specified if desired for attn_mask, mask_name in zip([head_mask, cross_attn_head_mask], ["head_mask", "cross_attn_head_mask"]): if attn_mask is not None: assert attn_mask.size()[0] == ( len(self.layers) ), f"The `{mask_name}` should be specified for {len(self.layers)} layers, but it is for {head_mask.size()[0]}." for idx, decoder_layer in enumerate(self.layers): i = idx if breakmodel: if i in range(ram_blocks): index1 = (i+1)%ram_blocks for param1,param2 in zip(self.layers[index1].parameters(),self.layers[(i-1)%ram_blocks].parameters()): param1.data = param2.data for param1,param2 in zip(self.layers[index1].parameters(),self.extrastorage[index1].parameters()): with torch.cuda.stream(copystream): torch.cuda.comm.broadcast(param2.data,out = [param1.data]) # add LayerDrop (see https://arxiv.org/abs/1909.11556 for description) if output_hidden_states: all_hidden_states += (hidden_states,) dropout_probability = random.uniform(0, 1) if self.training and (dropout_probability < self.layerdrop): continue past_key_value = past_key_values[idx] if past_key_values is not None else None if self.gradient_checkpointing and self.training: if use_cache: logger.warning( "`use_cache = True` is incompatible with gradient checkpointing`. Setting `use_cache = False`..." ) use_cache = False def create_custom_forward(module): def custom_forward(*inputs): # None for past_key_value return module(*inputs, output_attentions, use_cache) return custom_forward layer_outputs = torch.utils.checkpoint.checkpoint( create_custom_forward(decoder_layer), hidden_states, attention_mask, encoder_hidden_states, encoder_attention_mask, head_mask[idx] if head_mask is not None else None, cross_attn_head_mask[idx] if cross_attn_head_mask is not None else None, None, ) else: if breakmodel: device = primary_device if i < ram_blocks else bisect.bisect_right(cumulative_gpu_blocks, i - ram_blocks) layer_outputs = decoder_layer( hidden_states.to(device) if breakmodel and hidden_states is not None else hidden_states, attention_mask=attention_mask.to(device) if breakmodel and attention_mask is not None else attention_mask, encoder_hidden_states=encoder_hidden_states.to(device) if breakmodel and encoder_hidden_states is not None else encoder_hidden_states, encoder_attention_mask=encoder_attention_mask.to(device) if breakmodel and encoder_attention_mask is not None else encoder_attention_mask, layer_head_mask=((head_mask[idx].to(device) if breakmodel and head_mask[idx] is not None else head_mask[idx]) if head_mask is not None else None), cross_attn_layer_head_mask=( (cross_attn_head_mask[idx].to(device) if breakmodel and cross_attn_head_mask[idx] is not None else cross_attn_head_mask[idx]) if cross_attn_head_mask is not None else None ), past_key_value=tuple(v.to(device) for v in past_key_value if v is not None) if breakmodel and past_key_value is not None and i >= ram_blocks and len(past_key_value) and past_key_value[0].device.index != device else past_key_value, output_attentions=output_attentions, use_cache=use_cache, ) hidden_states = layer_outputs[0] if use_cache: next_decoder_cache += (layer_outputs[3 if output_attentions else 1],) if output_attentions: all_self_attns += (layer_outputs[1],) if encoder_hidden_states is not None: all_cross_attentions += (layer_outputs[2],) if breakmodel: if i in range(ram_blocks): torch.cuda.synchronize() torch.cuda.empty_cache() if breakmodel: if ram_blocks: del copystream torch.cuda.empty_cache() hidden_states = hidden_states.to(primary_device) hidden_states = self.layer_norm(hidden_states) if breakmodel: hidden_states = hidden_states.to(primary_device) # add hidden states from the last decoder layer if output_hidden_states: all_hidden_states += (hidden_states,) next_cache = next_decoder_cache if use_cache else None if not return_dict: return tuple( v for v in [hidden_states, next_cache, all_hidden_states, all_self_attns, all_cross_attentions] if v is not None ) return BaseModelOutputWithPastAndCrossAttentions( last_hidden_state=hidden_states, past_key_values=next_cache, hidden_states=all_hidden_states, attentions=all_self_attns, cross_attentions=all_cross_attentions, ) def new_forward_opt( self, input_ids=None, attention_mask=None, head_mask=None, past_key_values=None, inputs_embeds=None, use_cache=None, output_attentions=None, output_hidden_states=None, return_dict=None, ): assert len(gpu_blocks) <= torch.cuda.device_count() assert sum(gpu_blocks) <= len(self.layers) ram_blocks = len(self.layers) - sum(gpu_blocks) cumulative_gpu_blocks = tuple(itertools.accumulate(gpu_blocks)) output_attentions = output_attentions if output_attentions is not None else self.config.output_attentions output_hidden_states = ( output_hidden_states if output_hidden_states is not None else self.config.output_hidden_states ) use_cache = use_cache if use_cache is not None else self.config.use_cache return_dict = return_dict if return_dict is not None else self.config.use_return_dict # retrieve input_ids and inputs_embeds if input_ids is not None and inputs_embeds is not None: raise ValueError("You cannot specify both decoder_input_ids and decoder_inputs_embeds at the same time") elif input_ids is not None: input_shape = input_ids.size() input_ids = input_ids.view(-1, input_shape[-1]) elif inputs_embeds is not None: input_shape = inputs_embeds.size()[:-1] else: raise ValueError("You have to specify either decoder_input_ids or decoder_inputs_embeds") past_key_values_length = past_key_values[0][0].shape[2] if past_key_values is not None else 0 if inputs_embeds is None: if breakmodel: input_ids = input_ids.to(primary_device) inputs_embeds = self.embed_tokens(input_ids) # embed positions if breakmodel: inputs_embeds = inputs_embeds.to(primary_device) if attention_mask is None: attention_mask = torch.ones(inputs_embeds.shape[:2], dtype=torch.bool, device=inputs_embeds.device) positions = self.embed_positions(attention_mask)[:, past_key_values_length:, :] if breakmodel: positions = positions.to(primary_device) attention_mask = self._prepare_decoder_attention_mask( attention_mask, input_shape, inputs_embeds, past_key_values_length ) if self.project_in is not None: inputs_embeds = self.project_in(inputs_embeds) hidden_states = inputs_embeds + positions hidden_states = nn.functional.dropout(hidden_states, p=self.dropout, training=self.training) # decoder layers all_hidden_states = () if output_hidden_states else None all_self_attns = () if output_attentions else None next_decoder_cache = () if use_cache else None if breakmodel and ram_blocks: copystream = torch.cuda.Stream(device=primary_device, priority=-1) # check if head_mask has a correct number of layers specified if desired for attn_mask, mask_name in zip([head_mask], ["head_mask"]): if attn_mask is not None: if attn_mask.size()[0] != (len(self.layers)): raise ValueError( f"The `{mask_name}` should be specified for {len(self.layers)} layers, but it is for" f" {head_mask.size()[0]}." ) for idx, decoder_layer in enumerate(self.layers): i = idx if breakmodel: if i in range(ram_blocks): index1 = (i+1)%ram_blocks for param1,param2 in zip(self.layers[index1].parameters(),self.layers[(i-1)%ram_blocks].parameters()): param1.data = param2.data for param1,param2 in zip(self.layers[index1].parameters(),self.extrastorage[index1].parameters()): with torch.cuda.stream(copystream): torch.cuda.comm.broadcast(param2.data,out = [param1.data]) # add LayerDrop (see https://arxiv.org/abs/1909.11556 for description) if output_hidden_states: all_hidden_states += (hidden_states,) dropout_probability = random.uniform(0, 1) if self.training and (dropout_probability < self.layerdrop): continue past_key_value = past_key_values[idx] if past_key_values is not None else None if self.gradient_checkpointing and self.training: if use_cache: logger.warning( "`use_cache=True` is incompatible with gradient checkpointing. Setting `use_cache=False`..." ) use_cache = False def create_custom_forward(module): def custom_forward(*inputs): # None for past_key_value return module(*inputs, output_attentions, None) return custom_forward layer_outputs = torch.utils.checkpoint.checkpoint( create_custom_forward(decoder_layer), hidden_states, attention_mask, head_mask[idx] if head_mask is not None else None, None, ) else: if breakmodel: device = primary_device if i < ram_blocks else bisect.bisect_right(cumulative_gpu_blocks, i - ram_blocks) layer_outputs = decoder_layer( hidden_states, attention_mask=attention_mask.to(device) if breakmodel and attention_mask is not None else attention_mask, layer_head_mask=((head_mask[idx].to(device) if breakmodel and head_mask[idx] is not None else head_mask[idx]) if head_mask is not None else None), past_key_value=tuple(v.to(device) for v in past_key_value if v is not None) if breakmodel and past_key_value is not None and i >= ram_blocks and len(past_key_value) and past_key_value[0].device.index != device else past_key_value, output_attentions=output_attentions, use_cache=use_cache, ) hidden_states = layer_outputs[0] if use_cache: next_decoder_cache += (layer_outputs[2 if output_attentions else 1],) if output_attentions: all_self_attns += (layer_outputs[1],) if breakmodel: if i in range(ram_blocks): torch.cuda.synchronize() torch.cuda.empty_cache() if breakmodel: if ram_blocks: del copystream torch.cuda.empty_cache() hidden_states = hidden_states.to(primary_device) if self.project_out is not None: hidden_states = self.project_out(hidden_states) if breakmodel: hidden_states = hidden_states.to(primary_device) # add hidden states from the last decoder layer if output_hidden_states: all_hidden_states += (hidden_states,) next_cache = next_decoder_cache if use_cache else None if not return_dict: return tuple(v for v in [hidden_states, next_cache, all_hidden_states, all_self_attns] if v is not None) return BaseModelOutputWithPast( last_hidden_state=hidden_states, past_key_values=next_cache, hidden_states=all_hidden_states, attentions=all_self_attns, )