# coding=utf-8 # Copyright 2022 EleutherAI and the HuggingFace Inc. team. All rights reserved. # # This code is based on EleutherAI's GPT-NeoX library and the GPT-NeoX # and OPT implementations in this library. It has been modified from its # original forms to accommodate minor architectural differences compared # to GPT-NeoX and OPT used by the Meta AI team that trained the model. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. """PyTorch LLaMA model.""" import json import math import warnings from typing import List, Optional, Tuple, Union import torch import torch.nn.functional as F import torch.utils.checkpoint from torch import nn from torch.nn import BCEWithLogitsLoss, CrossEntropyLoss, MSELoss from transformers.activations import ACT2FN from transformers.cache_utils import Cache, DynamicCache, StaticCache from transformers.modeling_attn_mask_utils import AttentionMaskConverter from transformers.modeling_outputs import ( BaseModelOutputWithPast, CausalLMOutputWithPast, MoeModelOutputWithPast, MoeCausalLMOutputWithPast, QuestionAnsweringModelOutput, SequenceClassifierOutputWithPast, ) from transformers.modeling_utils import PreTrainedModel from transformers.pytorch_utils import ALL_LAYERNORM_LAYERS from transformers.utils import ( add_start_docstrings, add_start_docstrings_to_model_forward, is_flash_attn_2_available, is_flash_attn_greater_or_equal_2_10, logging, replace_return_docstrings, ) # we just reuse everything we don't modified from transformers.models.llama.modeling_llama import ( LlamaRMSNorm, LlamaRotaryEmbedding, LlamaLinearScalingRotaryEmbedding, LlamaDynamicNTKScalingRotaryEmbedding, LlamaAttention, LlamaMLP, LlamaFlashAttention2, LlamaSdpaAttention, LlamaDecoderLayer ) from .configuration_llama import LlamaMoDConfig if is_flash_attn_2_available(): from flash_attn import flash_attn_func, flash_attn_varlen_func from flash_attn.bert_padding import index_first_axis, pad_input, unpad_input # noqa logger = logging.get_logger(__name__) _CONFIG_FOR_DOC = "LlamaMoDConfig" def _get_unpad_data(attention_mask): seqlens_in_batch = attention_mask.sum(dim=-1, dtype=torch.int32) indices = torch.nonzero(attention_mask.flatten(), as_tuple=False).flatten() max_seqlen_in_batch = seqlens_in_batch.max().item() cu_seqlens = F.pad(torch.cumsum(seqlens_in_batch, dim=0, dtype=torch.int32), (1, 0)) return ( indices, cu_seqlens, max_seqlen_in_batch, ) ALL_LAYERNORM_LAYERS.append(LlamaRMSNorm) LLAMA_ATTENTION_CLASSES = { "eager": LlamaAttention, "flash_attention_2": LlamaFlashAttention2, "sdpa": LlamaSdpaAttention, } def dual_router_aux_loss( gate_logits: torch.Tensor, num_experts: torch.Tensor = 40, capacity_load=5, attention_mask: Optional[torch.Tensor] = None ) -> float: r""" Computes auxiliary load balancing loss as in Layer wise mode - implemented in Pytorch. Modified from Switch Transformer (https://arxiv.org/abs/2101.03961), I mean mixtral model. This function implements the loss function presented in equations (4) - (6) of the paper. It aims at penalizing cases where the routing between experts is too unbalanced. Args: gate_logits (Union[`torch.Tensor`, Tuple[torch.Tensor]): Logits from the `gate`, should be a tuple of model.config.num_hidden_layers tensors of shape [batch_size X sequence_length, num_experts]. attention_mask (`torch.Tensor`, None): The attention_mask used in forward function shape [batch_size X sequence_length] if not None. num_experts (`int`): Number of layers top_k (`int`): Number of experts (capacility load * num_experts) Returns: The auxiliary loss. """ if gate_logits is None or not isinstance(gate_logits, tuple): return 0 bce_loss = nn.BCEWithLogitsLoss() if isinstance(gate_logits, tuple): compute_device = gate_logits[0].device concatenated_gate_logits = torch.cat([layer_gate.unsqueeze(-1).to(compute_device) for layer_gate in gate_logits], dim=-1) seq_len = concatenated_gate_logits.shape[1] top_k = int(capacity_load*seq_len) bs = concatenated_gate_logits.shape[0] # concatenated_gate_logits : bs x seq_len x [ route logits, mlp router pred ] x layers routing_weights = torch.nn.functional.softmax(concatenated_gate_logits[:, :, 0, :], dim=1) # routing_weights = routing_weights _, selected_tokens = torch.topk(routing_weights, top_k, dim=1) pred_logits = concatenated_gate_logits[:, :, 1, :] router_targets = torch.zeros_like(pred_logits).view(-1) router_targets[selected_tokens.view(-1)] = 1.0 loss = bce_loss(pred_logits, router_targets.view(bs, seq_len, -1)) return loss class LlamaMoDDuaRouter(nn.Module): # implement the prediction inside this instead to make sure weights are transferable # Implement method 1 def __init__(self, config: LlamaMoDConfig, layer_idx: int): super().__init__() self.hidden_size = config.hidden_size self.layer_idx = layer_idx self.capacity_factor = config.capacity_load self.dynamic_skip = config.setup_layer_mod[layer_idx] if self.dynamic_skip: self.mod_router = nn.Linear(self.hidden_size, 1, bias=False) # used in inference instead self.mlp_router = nn.Sequential( nn.Linear(self.hidden_size, self.hidden_size//2), nn.SiLU(), nn.Linear(self.hidden_size//2, 1, bias=False) ) self.self_attn = LLAMA_ATTENTION_CLASSES[config._attn_implementation](config=config, layer_idx=layer_idx) self.mlp = LlamaMLP(config) self.input_layernorm = LlamaRMSNorm(config.hidden_size, eps=config.rms_norm_eps) self.post_attention_layernorm = LlamaRMSNorm(config.hidden_size, eps=config.rms_norm_eps) def forward( self, hidden_states: torch.Tensor, attention_mask: Optional[torch.Tensor] = None, position_ids: Optional[torch.LongTensor] = None, past_key_value: Optional[Tuple[torch.Tensor]] = None, output_attentions: Optional[bool] = False, use_cache: Optional[bool] = False, cache_position: Optional[torch.LongTensor] = None, **kwargs, ) -> Tuple[torch.FloatTensor, Optional[Tuple[torch.FloatTensor, torch.FloatTensor]]]: """ Args: hidden_states (`torch.FloatTensor`): input to the layer of shape `(batch, seq_len, embed_dim)` attention_mask (`torch.FloatTensor`, *optional*): attention mask of size `(batch_size, sequence_length)` if flash attention is used or `(batch_size, 1, query_sequence_length, key_sequence_length)` if default attention is used. output_attentions (`bool`, *optional*): Whether or not to return the attentions tensors of all attention layers. See `attentions` under returned tensors for more detail. use_cache (`bool`, *optional*): If set to `True`, `past_key_values` key value states are returned and can be used to speed up decoding (see `past_key_values`). past_key_value (`Tuple(torch.FloatTensor)`, *optional*): cached past key and value projection states """ if "padding_mask" in kwargs: warnings.warn( "Passing `padding_mask` is deprecated and will be removed in v4.37. Please make sure use `attention_mask` instead.`" ) initial_residual = hidden_states if self.dynamic_skip: residual = hidden_states seq_len = hidden_states.shape[1] route = torch.softmax(self.mod_router(hidden_states), dim=1) mlp_router_logits = self.mlp_router(hidden_states) if not self.training: # use mlp for during inference _old_router = route route = torch.sigmoid(mlp_router_logits) hidden_states = self.input_layernorm(hidden_states) if not self.training and hidden_states.shape[1] == 1 and hidden_states.shape[0] == 1: # TODO: fix this broke when batch is > 1 if route[-1] > 0.5: hidden_states, self_attn_weights, present_key_value = self.self_attn( hidden_states=hidden_states, attention_mask=attention_mask, position_ids=position_ids, past_key_value=past_key_value, output_attentions=output_attentions, use_cache=use_cache, **kwargs, ) hidden_states = residual + hidden_states # Fully Connected residual = hidden_states hidden_states = self.post_attention_layernorm(hidden_states) hidden_states = self.mlp(hidden_states) hidden_states = residual + hidden_states hidden_states *= route else: hidden_states = initial_residual self_attn_weights = None present_key_value = None else: # There should be a sigmoid version where we sample the route based on > 0.5 # but this doesn't really work mainly in batch inference acc_route_choice = torch.cumsum(route > 0.5, dim=-1) min_top_k = max(int(self.capacity_factor*seq_len), 2) top_k = max(torch.max(acc_route_choice), min_top_k) weights, selected_tokens = torch.topk(route, top_k, dim=1, sorted=False) # reorder back to original position? selected_tokens, index = torch.sort(selected_tokens, dim=1) weights = torch.gather(weights, dim=1, index=index) indices_expanded = selected_tokens.expand(-1, -1, self.hidden_size) sub_hidden_states = torch.gather(hidden_states, 1, indices_expanded) sub_position_ids = position_ids[: , :top_k] if len(attention_mask.shape) == 4: sub_attention_mask = attention_mask[:, :, :top_k,:top_k] else: sub_attention_mask = attention_mask[:, :top_k] residual = sub_hidden_states sub_hidden_states, attn_weights, present_key_value = self.self_attn( hidden_states=sub_hidden_states, attention_mask=sub_attention_mask, position_ids=sub_position_ids, past_key_value=past_key_value, output_attentions=output_attentions, use_cache=use_cache, **kwargs, ) if not self.training: print(int(top_k), seq_len, self.layer_idx) print(selected_tokens.flatten()) print(_old_router.flatten()) print(route.flatten()) sub_hidden_states = residual + sub_hidden_states sub_residual = sub_hidden_states # MLP sub_hidden_states = self.post_attention_layernorm(sub_hidden_states) sub_hidden_states = self.mlp(sub_hidden_states) sub_hidden_states = sub_residual + sub_hidden_states hidden_states = torch.scatter( initial_residual, dim=1, index=indices_expanded, src=sub_hidden_states * weights, ) else: residual = initial_residual hidden_states = self.input_layernorm(hidden_states) # Self Attention hidden_states, self_attn_weights, present_key_value = self.self_attn( hidden_states=hidden_states, attention_mask=attention_mask, position_ids=position_ids, past_key_value=past_key_value, output_attentions=output_attentions, use_cache=use_cache, **kwargs, ) hidden_states = residual + hidden_states # Fully Connected residual = hidden_states hidden_states = self.post_attention_layernorm(hidden_states) hidden_states = self.mlp(hidden_states) hidden_states = residual + hidden_states # this section must be modified during inference, otherwise no speedup outputs = (hidden_states,) if output_attentions: outputs += (self_attn_weights,) if use_cache: outputs += (present_key_value,) if self.dynamic_skip: outputs += (torch.concat([route, mlp_router_logits], dim=-1), ) return outputs def load_balancing_loss_func( gate_logits: torch.Tensor, num_experts: torch.Tensor = 40, capacity_load=0.125, attention_mask: Optional[torch.Tensor] = None ) -> float: r""" Computes auxiliary load balancing loss as in Layer wise mode - implemented in Pytorch. The original paper of mixture of depth didn't specify beyond one word : use aux loss I would assume its from this: Modified from Switch Transformer (https://arxiv.org/abs/2101.03961), I mean mixtral model. This function implements the loss function presented in equations (4) - (6) of the paper. It aims at penalizing cases where the routing between experts is too unbalanced. Args: gate_logits (Union[`torch.Tensor`, Tuple[torch.Tensor]): Logits from the `gate`, should be a tuple of model.config.num_hidden_layers tensors of shape [batch_size X sequence_length, num_experts]. attention_mask (`torch.Tensor`, None): The attention_mask used in forward function shape [batch_size X sequence_length] if not None. num_experts (`int`): Number of layers top_k (`int`): Number of experts (capacility load * num_experts) Returns: The auxiliary loss. """ if gate_logits is None or not isinstance(gate_logits, tuple): return 0 if isinstance(gate_logits, tuple): compute_device = gate_logits[0].device concatenated_gate_logits = torch.cat([layer_gate.to(compute_device) for layer_gate in gate_logits], dim=-1) batch_size, sequence_length, num_hidden_layers = concatenated_gate_logits.shape top_k = int(capacity_load*sequence_length) # bs x seq_length x layers routing_weights = torch.nn.functional.sigmoid(concatenated_gate_logits) # bs x layers x seq_length routing_weights = routing_weights.permute(0, 2, 1) _, selected_experts = torch.topk(routing_weights, top_k, dim=-1) expert_mask = torch.nn.functional.one_hot(selected_experts, sequence_length) expert_mask = expert_mask.reshape(-1, top_k, sequence_length) # bs x num_layers x top_k x sequence length if attention_mask is None: # Compute the percentage of tokens routed to each experts tokens_per_expert = torch.mean(expert_mask.float(), dim=0) # Compute the average probability of routing to these experts router_prob_per_expert = torch.mean(routing_weights, dim=0) else: # Compute the mask that masks all padding tokens as 0 with the same shape of expert_mask expert_attention_mask = ( attention_mask[:, :, None, None] .expand((batch_size, sequence_length, top_k, num_experts)) .permute(0, 3, 2, 1) .reshape(-1, top_k, sequence_length) .to(compute_device) ) # Compute the percentage of tokens routed to each position id tokens_per_expert = torch.sum(expert_mask.float() * expert_attention_mask, dim=0) / torch.sum( expert_attention_mask, dim=0 ) # Compute the mask that masks all padding tokens as 0 with the same shape of tokens_per_expert router_per_expert_attention_mask = ( attention_mask[:, :, None] .expand((batch_size, sequence_length, num_experts)) .reshape(-1, sequence_length) .to(compute_device) ) # Compute the average probability of routing to these experts router_prob_per_expert = torch.sum(routing_weights.reshape(-1, sequence_length) * router_per_expert_attention_mask, dim=0) / torch.sum( router_per_expert_attention_mask, dim=0 ) overall_loss = torch.sum(tokens_per_expert * router_prob_per_expert.unsqueeze(0)) return overall_loss class LlamaMoDBalanceAux(nn.Module): # implement the prediction inside this instead to make sure weights are transferable # Implement method 1 def __init__(self, config: LlamaMoDConfig, layer_idx: int): super().__init__() self.hidden_size = config.hidden_size self.layer_idx = layer_idx self.capacity_factor = config.capacity_load self.dynamic_skip = config.setup_layer_mod[layer_idx] if self.dynamic_skip: self.mod_router = nn.Linear(self.hidden_size, 1, bias=True) self.self_attn = LLAMA_ATTENTION_CLASSES[config._attn_implementation](config=config, layer_idx=layer_idx) self.mlp = LlamaMLP(config) self.input_layernorm = LlamaRMSNorm(config.hidden_size, eps=config.rms_norm_eps) self.post_attention_layernorm = LlamaRMSNorm(config.hidden_size, eps=config.rms_norm_eps) def forward( self, hidden_states: torch.Tensor, attention_mask: Optional[torch.Tensor] = None, position_ids: Optional[torch.LongTensor] = None, past_key_value: Optional[Tuple[torch.Tensor]] = None, output_attentions: Optional[bool] = False, use_cache: Optional[bool] = False, cache_position: Optional[torch.LongTensor] = None, **kwargs, ) -> Tuple[torch.FloatTensor, Optional[Tuple[torch.FloatTensor, torch.FloatTensor]]]: """ Args: hidden_states (`torch.FloatTensor`): input to the layer of shape `(batch, seq_len, embed_dim)` attention_mask (`torch.FloatTensor`, *optional*): attention mask of size `(batch_size, sequence_length)` if flash attention is used or `(batch_size, 1, query_sequence_length, key_sequence_length)` if default attention is used. output_attentions (`bool`, *optional*): Whether or not to return the attentions tensors of all attention layers. See `attentions` under returned tensors for more detail. use_cache (`bool`, *optional*): If set to `True`, `past_key_values` key value states are returned and can be used to speed up decoding (see `past_key_values`). past_key_value (`Tuple(torch.FloatTensor)`, *optional*): cached past key and value projection states """ if "padding_mask" in kwargs: warnings.warn( "Passing `padding_mask` is deprecated and will be removed in v4.37. Please make sure use `attention_mask` instead.`" ) initial_residual = hidden_states if self.dynamic_skip: residual = hidden_states seq_len = hidden_states.shape[1] route = torch.sigmoid(self.mod_router(hidden_states)) if not self.training and (hidden_states.shape[1] == 1 and hidden_states.shape[0] == 1): # TODO: fix this broke when batch is > 1 # single inference mode if route[-1] > 0.5: hidden_states = self.input_layernorm(hidden_states) hidden_states, self_attn_weights, present_key_value = self.self_attn( hidden_states=hidden_states, attention_mask=attention_mask, position_ids=position_ids, past_key_value=past_key_value, output_attentions=output_attentions, use_cache=use_cache, **kwargs, ) hidden_states = residual + hidden_states # Fully Connected residual = hidden_states hidden_states = self.post_attention_layernorm(hidden_states) hidden_states = self.mlp(hidden_states) hidden_states = residual + hidden_states else: hidden_states = initial_residual self_attn_weights = None present_key_value = None else: acc_route_choice = torch.cumsum(route > 0.5, dim=1) min_top_k = max(int(self.capacity_factor*seq_len), 2) top_k = max(torch.max(acc_route_choice), min_top_k) # with open('experiments_bias_0.1_aux_0.001.jsonl', 'a') as fout: # fout.write(json.dumps({'idx': self.layer_idx, 'top_k': int(top_k), 'seq_len': seq_len})+'\n') weights, selected_tokens = torch.topk(route, top_k, dim=1, sorted=False) # reorder back to original position? selected_tokens, index = torch.sort(selected_tokens, dim=1) if not self.training: print(int(top_k), seq_len, self.layer_idx) print(selected_tokens.flatten()) weights = torch.gather(weights, dim=1, index=index) indices_expanded = selected_tokens.expand(-1, -1, self.hidden_size) sub_hidden_states = torch.gather(hidden_states, 1, indices_expanded) sub_position_ids = position_ids[: , :top_k] if len(attention_mask.shape) == 4: sub_attention_mask = attention_mask[:, :, :top_k,:top_k] else: sub_attention_mask = attention_mask[:, :top_k] residual = sub_hidden_states sub_hidden_states = self.input_layernorm(sub_hidden_states) sub_hidden_states, attn_weights, present_key_value = self.self_attn( hidden_states=sub_hidden_states, attention_mask=sub_attention_mask, position_ids=sub_position_ids, past_key_value=past_key_value, output_attentions=output_attentions, use_cache=use_cache, **kwargs, ) sub_hidden_states = residual + sub_hidden_states sub_residual = sub_hidden_states # MLP sub_hidden_states = self.post_attention_layernorm(sub_hidden_states) sub_hidden_states = self.mlp(sub_hidden_states) sub_hidden_states = sub_residual + sub_hidden_states hidden_states = sub_hidden_states hidden_states = torch.scatter( initial_residual, dim=1, index=indices_expanded, src=sub_hidden_states, ) else: residual = initial_residual hidden_states = self.input_layernorm(hidden_states) # Self Attention hidden_states, self_attn_weights, present_key_value = self.self_attn( hidden_states=hidden_states, attention_mask=attention_mask, position_ids=position_ids, past_key_value=past_key_value, output_attentions=output_attentions, use_cache=use_cache, **kwargs, ) hidden_states = residual + hidden_states # Fully Connected residual = hidden_states hidden_states = self.post_attention_layernorm(hidden_states) hidden_states = self.mlp(hidden_states) hidden_states = residual + hidden_states # this section must be modified during inference, otherwise no speedup outputs = (hidden_states,) if output_attentions: outputs += (self_attn_weights,) if use_cache: outputs += (present_key_value,) if self.dynamic_skip: outputs += (route, ) return outputs class LlamaPreTrainedModel(PreTrainedModel): config_class = LlamaMoDConfig base_model_prefix = "model" supports_gradient_checkpointing = True _no_split_modules = ["LlamaDecoderLayer"] _skip_keys_device_placement = ["past_key_values"] _supports_flash_attn_2 = True _supports_sdpa = True _supports_cache_class = True def _init_weights(self, module): std = self.config.initializer_range if isinstance(module, nn.Linear): module.weight.data.normal_(mean=0.0, std=std) if module.bias is not None: module.bias.data.zero_() elif isinstance(module, nn.Embedding): module.weight.data.normal_(mean=0.0, std=std) if module.padding_idx is not None: module.weight.data[module.padding_idx].zero_() def _setup_cache(self, cache_cls, max_batch_size, max_cache_len: Optional[int] = None): if self.config._attn_implementation == "flash_attention_2" and cache_cls == StaticCache: raise ValueError( "`static` cache implementation is not compatible with `attn_implementation==flash_attention_2` " "make sure to use `sdpa` in the mean time, and open an issue at https://github.com/huggingface/transformers" ) for layer in self.model.layers: device = layer.input_layernorm.weight.device if hasattr(self.config, "_pre_quantization_dtype"): dtype = self.config._pre_quantization_dtype else: dtype = layer.self_attn.o_proj.weight.dtype layer.self_attn.past_key_value = cache_cls( self.config, max_batch_size, max_cache_len, device=device, dtype=dtype ) def _reset_cache(self): for layer in self.model.layers: layer.self_attn.past_key_value = None LLAMA_DECODER_LAYER = { 'none': LlamaDecoderLayer, 'mod_1aux': LlamaMoDBalanceAux, 'mod_dual': LlamaMoDDuaRouter } AUX_LOSS = { 'mod_1aux': load_balancing_loss_func, 'mod_dual': dual_router_aux_loss } class LlamaMoDModel(LlamaPreTrainedModel): """ Transformer decoder consisting of *config.num_hidden_layers* layers. Each layer is a [`LlamaDecoderLayer`] Args: config: LlamaMoDConfig """ def __init__(self, config: LlamaMoDConfig): super().__init__(config) self.padding_idx = config.pad_token_id self.vocab_size = config.vocab_size self.embed_tokens = nn.Embedding(config.vocab_size, config.hidden_size, self.padding_idx) self.has_router = config.mod_method != 'none' self.layers = nn.ModuleList( [LLAMA_DECODER_LAYER[config.mod_method](config, layer_idx) for layer_idx in range(config.num_hidden_layers)] ) self.norm = LlamaRMSNorm(config.hidden_size, eps=config.rms_norm_eps) self.gradient_checkpointing = False # Initialize weights and apply final processing self.post_init() def get_input_embeddings(self): return self.embed_tokens def set_input_embeddings(self, value): self.embed_tokens = value def forward( self, input_ids: torch.LongTensor = None, attention_mask: Optional[torch.Tensor] = None, position_ids: Optional[torch.LongTensor] = None, past_key_values: Optional[List[torch.FloatTensor]] = None, inputs_embeds: Optional[torch.FloatTensor] = None, use_cache: Optional[bool] = None, output_attentions: Optional[bool] = None, output_hidden_states: Optional[bool] = None, return_dict: Optional[bool] = None, cache_position: Optional[torch.LongTensor] = None, output_router_logits: Optional[bool] = None, ) -> Union[Tuple, BaseModelOutputWithPast]: 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 None) ^ (inputs_embeds is not None): raise ValueError( "You cannot specify both input_ids and inputs_embeds at the same time, and must specify either one" ) if self.gradient_checkpointing and self.training and use_cache: logger.warning_once( "`use_cache=True` is incompatible with gradient checkpointing. Setting `use_cache=False`." ) use_cache = False if inputs_embeds is None: inputs_embeds = self.embed_tokens(input_ids) past_seen_tokens = 0 if use_cache: # kept for BC (cache positions) if not isinstance(past_key_values, StaticCache): past_key_values = DynamicCache.from_legacy_cache(past_key_values) past_seen_tokens = past_key_values.get_seq_length() if cache_position is None: if isinstance(past_key_values, StaticCache): raise ValueError("cache_position is a required argument when using StaticCache.") cache_position = torch.arange( past_seen_tokens, past_seen_tokens + inputs_embeds.shape[1], device=inputs_embeds.device ) if position_ids is None: position_ids = cache_position.unsqueeze(0) causal_mask = self._update_causal_mask( attention_mask, inputs_embeds, cache_position, past_seen_tokens + inputs_embeds.shape[1] ) # embed positions hidden_states = inputs_embeds # decoder layers all_hidden_states = () if output_hidden_states else None all_self_attns = () if output_attentions else None all_router_logits = () if output_router_logits else None next_decoder_cache = None for decoder_layer in self.layers: if output_hidden_states: all_hidden_states += (hidden_states,) if self.gradient_checkpointing and self.training: layer_outputs = self._gradient_checkpointing_func( decoder_layer.__call__, hidden_states, causal_mask, position_ids, past_key_values, output_attentions, use_cache, cache_position, ) else: layer_outputs = decoder_layer( hidden_states, attention_mask=causal_mask, position_ids=position_ids, past_key_value=past_key_values, output_attentions=output_attentions, use_cache=use_cache, cache_position=cache_position, ) 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 self.has_router and decoder_layer.dynamic_skip and output_router_logits: all_router_logits += (layer_outputs[-1],) hidden_states = self.norm(hidden_states) # add hidden states from the last decoder layer if output_hidden_states: all_hidden_states += (hidden_states,) next_cache = None if use_cache: next_cache = ( next_decoder_cache.to_legacy_cache() if isinstance(next_decoder_cache, Cache) else next_decoder_cache ) 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 MoeModelOutputWithPast( last_hidden_state=hidden_states, past_key_values=next_cache, hidden_states=all_hidden_states, attentions=all_self_attns, router_logits=all_router_logits ) # TODO: As of torch==2.2.0, the `attention_mask` passed to the model in `generate` is 2D and of dynamic length even when the static # KV cache is used. This is an issue for torch.compile which then recaptures cudagraphs at each decode steps due to the dynamic shapes. # (`recording cudagraph tree for symint key 13`, etc.), which is VERY slow. A workaround is `@torch.compiler.disable`, but this prevents using # `fullgraph=True`. See more context in https://github.com/huggingface/transformers/pull/29114 def _update_causal_mask(self, attention_mask, input_tensor, cache_position, current_length): if self.config._attn_implementation == "flash_attention_2": if attention_mask is not None and 0.0 in attention_mask: return attention_mask return None dtype, device = input_tensor.dtype, input_tensor.device min_dtype = torch.finfo(dtype).min sequence_length = input_tensor.shape[1] if hasattr(getattr(self.layers[0], "self_attn", {}), "past_key_value"): # static cache target_length = self.config.max_position_embeddings else: # dynamic cache target_length = ( attention_mask.shape[-1] if isinstance(attention_mask, torch.Tensor) else current_length + 1 ) causal_mask = torch.full((sequence_length, target_length), fill_value=min_dtype, dtype=dtype, device=device) if sequence_length != 1: causal_mask = torch.triu(causal_mask, diagonal=1) causal_mask *= torch.arange(target_length, device=device) > cache_position.reshape(-1, 1) causal_mask = causal_mask[None, None, :, :].expand(input_tensor.shape[0], 1, -1, -1) if attention_mask is not None: causal_mask = causal_mask.clone() # copy to contiguous memory for in-place edit if attention_mask.dim() == 2: mask_length = attention_mask.shape[-1] padding_mask = causal_mask[..., :mask_length].eq(0.0) * attention_mask[:, None, None, :].eq(0.0) causal_mask[..., :mask_length] = causal_mask[..., :mask_length].masked_fill(padding_mask, min_dtype) elif attention_mask.dim() == 4: # backwards compatibility: we allow passing a 4D attention mask shorter than the input length with # cache. In that case, the 4D attention mask attends to the newest tokens only. if attention_mask.shape[-2] < cache_position[0] + sequence_length: offset = cache_position[0] else: offset = 0 mask_shape = attention_mask.shape mask_slice = (attention_mask.eq(0.0)).to(dtype=dtype) * min_dtype causal_mask[ : mask_shape[0], : mask_shape[1], offset : mask_shape[2] + offset, : mask_shape[3] ] = mask_slice if ( self.config._attn_implementation == "sdpa" and attention_mask is not None and attention_mask.device.type == "cuda" ): # Attend to all tokens in fully masked rows in the causal_mask, for example the relevant first rows when # using left padding. This is required by F.scaled_dot_product_attention memory-efficient attention path. # Details: https://github.com/pytorch/pytorch/issues/110213 causal_mask = AttentionMaskConverter._unmask_unattended(causal_mask, min_dtype) return causal_mask class LlamaMoDForCausalLM(LlamaPreTrainedModel): _tied_weights_keys = ["lm_head.weight"] def __init__(self, config): super().__init__(config) self.model = LlamaMoDModel(config) self.vocab_size = config.vocab_size self.route_method = config.mod_method self.router_aux_loss_coef = config.router_aux_loss_coef if config.mod_method != 'none': self.num_experts = sum(config.setup_layer_mod) self.capacity_load = config.capacity_load self.lm_head = nn.Linear(config.hidden_size, config.vocab_size, bias=False) # Initialize weights and apply final processing self.post_init() def get_input_embeddings(self): return self.model.embed_tokens def set_input_embeddings(self, value): self.model.embed_tokens = value def get_output_embeddings(self): return self.lm_head def set_output_embeddings(self, new_embeddings): self.lm_head = new_embeddings def set_decoder(self, decoder): self.model = decoder def get_decoder(self): return self.model def forward( self, input_ids: torch.LongTensor = None, attention_mask: Optional[torch.Tensor] = None, position_ids: Optional[torch.LongTensor] = None, past_key_values: Optional[List[torch.FloatTensor]] = None, inputs_embeds: Optional[torch.FloatTensor] = None, labels: Optional[torch.LongTensor] = None, use_cache: Optional[bool] = None, output_attentions: Optional[bool] = None, output_hidden_states: Optional[bool] = None, return_dict: Optional[bool] = None, cache_position: Optional[torch.LongTensor] = None, output_router_logits: Optional[bool] = None, ) -> Union[Tuple, CausalLMOutputWithPast]: r""" Args: labels (`torch.LongTensor` of shape `(batch_size, sequence_length)`, *optional*): Labels for computing the masked language modeling loss. Indices should either be in `[0, ..., config.vocab_size]` or -100 (see `input_ids` docstring). Tokens with indices set to `-100` are ignored (masked), the loss is only computed for the tokens with labels in `[0, ..., config.vocab_size]`. Returns: Example: ```python >>> from transformers import AutoTokenizer, LlamaForCausalLM >>> model = LlamaForCausalLM.from_pretrained("meta-llama/Llama-2-7b-hf") >>> tokenizer = AutoTokenizer.from_pretrained("meta-llama/Llama-2-7b-hf") >>> prompt = "Hey, are you conscious? Can you talk to me?" >>> inputs = tokenizer(prompt, return_tensors="pt") >>> # Generate >>> generate_ids = model.generate(inputs.input_ids, max_length=30) >>> tokenizer.batch_decode(generate_ids, skip_special_tokens=True, clean_up_tokenization_spaces=False)[0] "Hey, are you conscious? Can you talk to me?\nI'm not conscious, but I can talk to you." ```""" 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 ) return_dict = return_dict if return_dict is not None else self.config.use_return_dict # decoder outputs consists of (dec_features, layer_state, dec_hidden, dec_attn) outputs = self.model( input_ids=input_ids, attention_mask=attention_mask, position_ids=position_ids, past_key_values=past_key_values, inputs_embeds=inputs_embeds, use_cache=use_cache, output_attentions=output_attentions, output_hidden_states=output_hidden_states, return_dict=return_dict, cache_position=cache_position, output_router_logits=output_router_logits ) hidden_states = outputs[0] if self.config.pretraining_tp > 1: lm_head_slices = self.lm_head.weight.split(self.vocab_size // self.config.pretraining_tp, dim=0) logits = [F.linear(hidden_states, lm_head_slices[i]) for i in range(self.config.pretraining_tp)] logits = torch.cat(logits, dim=-1) else: logits = self.lm_head(hidden_states) logits = logits.float() loss = None if labels is not None: # Shift so that tokens < n predict n shift_logits = logits[..., :-1, :].contiguous() shift_labels = labels[..., 1:].contiguous() # Flatten the tokens loss_fct = CrossEntropyLoss() shift_logits = shift_logits.view(-1, self.config.vocab_size) shift_labels = shift_labels.view(-1) # Enable model parallelism shift_labels = shift_labels.to(shift_logits.device) loss = loss_fct(shift_logits, shift_labels) if output_router_logits: aux_loss = AUX_LOSS[self.route_method]( outputs.router_logits if return_dict else outputs[-1], self.num_experts, self.capacity_load, attention_mask, ) if labels is not None: loss += self.router_aux_loss_coef * aux_loss.to(loss.device) if not return_dict: output = (logits,) + outputs[1:] return (loss,) + output if loss is not None else output return MoeCausalLMOutputWithPast( loss=loss, logits=logits, past_key_values=outputs.past_key_values, hidden_states=outputs.hidden_states, attentions=outputs.attentions, ) def prepare_inputs_for_generation( self, input_ids, past_key_values=None, attention_mask=None, inputs_embeds=None, cache_position=None, **kwargs ): # With static cache, the `past_key_values` is None # TODO joao: standardize interface for the different Cache classes and remove of this if has_static_cache = False if past_key_values is None: past_key_values = getattr(getattr(self.model.layers[0], "self_attn", {}), "past_key_value", None) has_static_cache = past_key_values is not None past_length = 0 if past_key_values is not None: if isinstance(past_key_values, Cache): past_length = cache_position[0] if cache_position is not None else past_key_values.get_seq_length() max_cache_length = ( torch.tensor(past_key_values.get_max_length(), device=input_ids.device) if past_key_values.get_max_length() is not None else None ) cache_length = past_length if max_cache_length is None else torch.min(max_cache_length, past_length) # TODO joao: remove this `else` after `generate` prioritizes `Cache` objects else: cache_length = past_length = past_key_values[0][0].shape[2] max_cache_length = None # Keep only the unprocessed tokens: # 1 - If the length of the attention_mask exceeds the length of input_ids, then we are in a setting where # some of the inputs are exclusively passed as part of the cache (e.g. when passing input_embeds as # input) if attention_mask is not None and attention_mask.shape[1] > input_ids.shape[1]: input_ids = input_ids[:, -(attention_mask.shape[1] - past_length) :] # 2 - If the past_length is smaller than input_ids', then input_ids holds all input tokens. We can discard # input_ids based on the past_length. elif past_length < input_ids.shape[1]: input_ids = input_ids[:, past_length:] # 3 - Otherwise (past_length >= input_ids.shape[1]), let's assume input_ids only has unprocessed tokens. # If we are about to go beyond the maximum cache length, we need to crop the input attention mask. if ( max_cache_length is not None and attention_mask is not None and cache_length + input_ids.shape[1] > max_cache_length ): attention_mask = attention_mask[:, -max_cache_length:] position_ids = kwargs.get("position_ids", None) if attention_mask is not None and position_ids is None: # create position_ids on the fly for batch generation position_ids = attention_mask.long().cumsum(-1) - 1 position_ids.masked_fill_(attention_mask == 0, 1) if past_key_values: position_ids = position_ids[:, -input_ids.shape[1] :] # if `inputs_embeds` are passed, we only want to use them in the 1st generation step if inputs_embeds is not None and past_key_values is None: model_inputs = {"inputs_embeds": inputs_embeds} else: # The `contiguous()` here is necessary to have a static stride during decoding. torchdynamo otherwise # recompiles graphs as the stride of the inputs is a guard. Ref: https://github.com/huggingface/transformers/pull/29114 # TODO: use `next_tokens` directly instead. model_inputs = {"input_ids": input_ids.contiguous()} input_length = position_ids.shape[-1] if position_ids is not None else input_ids.shape[-1] if cache_position is None: cache_position = torch.arange(past_length, past_length + input_length, device=input_ids.device) else: cache_position = cache_position[-input_length:] if has_static_cache: past_key_values = None model_inputs.update( { "position_ids": position_ids, "cache_position": cache_position, "past_key_values": past_key_values, "use_cache": kwargs.get("use_cache"), "attention_mask": attention_mask, } ) return model_inputs @staticmethod def _reorder_cache(past_key_values, beam_idx): reordered_past = () for layer_past in past_key_values: reordered_past += ( tuple(past_state.index_select(0, beam_idx.to(past_state.device)) for past_state in layer_past), ) return reordered_past class LlamaForSequenceClassification(LlamaPreTrainedModel): def __init__(self, config): super().__init__(config) self.num_labels = config.num_labels self.model = LlamaModel(config) self.score = nn.Linear(config.hidden_size, self.num_labels, bias=False) # Initialize weights and apply final processing self.post_init() def get_input_embeddings(self): return self.model.embed_tokens def set_input_embeddings(self, value): self.model.embed_tokens = value def forward( self, input_ids: torch.LongTensor = None, attention_mask: Optional[torch.Tensor] = None, position_ids: Optional[torch.LongTensor] = None, past_key_values: Optional[List[torch.FloatTensor]] = None, inputs_embeds: Optional[torch.FloatTensor] = None, labels: Optional[torch.LongTensor] = None, use_cache: Optional[bool] = None, output_attentions: Optional[bool] = None, output_hidden_states: Optional[bool] = None, return_dict: Optional[bool] = None, ) -> Union[Tuple, SequenceClassifierOutputWithPast]: r""" labels (`torch.LongTensor` of shape `(batch_size,)`, *optional*): Labels for computing the sequence classification/regression loss. Indices should be in `[0, ..., config.num_labels - 1]`. If `config.num_labels == 1` a regression loss is computed (Mean-Square loss), If `config.num_labels > 1` a classification loss is computed (Cross-Entropy). """ return_dict = return_dict if return_dict is not None else self.config.use_return_dict transformer_outputs = self.model( input_ids, attention_mask=attention_mask, position_ids=position_ids, past_key_values=past_key_values, inputs_embeds=inputs_embeds, use_cache=use_cache, output_attentions=output_attentions, output_hidden_states=output_hidden_states, return_dict=return_dict, ) hidden_states = transformer_outputs[0] logits = self.score(hidden_states) if input_ids is not None: batch_size = input_ids.shape[0] else: batch_size = inputs_embeds.shape[0] if self.config.pad_token_id is None and batch_size != 1: raise ValueError("Cannot handle batch sizes > 1 if no padding token is defined.") if self.config.pad_token_id is None: sequence_lengths = -1 else: if input_ids is not None: # if no pad token found, use modulo instead of reverse indexing for ONNX compatibility sequence_lengths = torch.eq(input_ids, self.config.pad_token_id).int().argmax(-1) - 1 sequence_lengths = sequence_lengths % input_ids.shape[-1] sequence_lengths = sequence_lengths.to(logits.device) else: sequence_lengths = -1 pooled_logits = logits[torch.arange(batch_size, device=logits.device), sequence_lengths] loss = None if labels is not None: labels = labels.to(logits.device) if self.config.problem_type is None: if self.num_labels == 1: self.config.problem_type = "regression" elif self.num_labels > 1 and (labels.dtype == torch.long or labels.dtype == torch.int): self.config.problem_type = "single_label_classification" else: self.config.problem_type = "multi_label_classification" if self.config.problem_type == "regression": loss_fct = MSELoss() if self.num_labels == 1: loss = loss_fct(pooled_logits.squeeze(), labels.squeeze()) else: loss = loss_fct(pooled_logits, labels) elif self.config.problem_type == "single_label_classification": loss_fct = CrossEntropyLoss() loss = loss_fct(pooled_logits.view(-1, self.num_labels), labels.view(-1)) elif self.config.problem_type == "multi_label_classification": loss_fct = BCEWithLogitsLoss() loss = loss_fct(pooled_logits, labels) if not return_dict: output = (pooled_logits,) + transformer_outputs[1:] return ((loss,) + output) if loss is not None else output return SequenceClassifierOutputWithPast( loss=loss, logits=pooled_logits, past_key_values=transformer_outputs.past_key_values, hidden_states=transformer_outputs.hidden_states, attentions=transformer_outputs.attentions, ) class LlamaForQuestionAnswering(LlamaPreTrainedModel): base_model_prefix = "transformer" # Copied from transformers.models.bloom.modeling_bloom.BloomForQuestionAnswering.__init__ with Bloom->Llama def __init__(self, config): super().__init__(config) self.transformer = LlamaModel(config) self.qa_outputs = nn.Linear(config.hidden_size, 2) # Initialize weights and apply final processing self.post_init() def get_input_embeddings(self): return self.transformer.embed_tokens def set_input_embeddings(self, value): self.transformer.embed_tokens = value def forward( self, input_ids: Optional[torch.LongTensor] = None, attention_mask: Optional[torch.FloatTensor] = None, position_ids: Optional[torch.LongTensor] = None, past_key_values: Optional[List[torch.FloatTensor]] = None, inputs_embeds: Optional[torch.FloatTensor] = None, start_positions: Optional[torch.LongTensor] = None, end_positions: Optional[torch.LongTensor] = None, output_attentions: Optional[bool] = None, output_hidden_states: Optional[bool] = None, return_dict: Optional[bool] = None, ) -> Union[Tuple, QuestionAnsweringModelOutput]: r""" start_positions (`torch.LongTensor` of shape `(batch_size,)`, *optional*): Labels for position (index) of the start of the labelled span for computing the token classification loss. Positions are clamped to the length of the sequence (`sequence_length`). Position outside of the sequence are not taken into account for computing the loss. end_positions (`torch.LongTensor` of shape `(batch_size,)`, *optional*): Labels for position (index) of the end of the labelled span for computing the token classification loss. Positions are clamped to the length of the sequence (`sequence_length`). Position outside of the sequence are not taken into account for computing the loss. """ return_dict = return_dict if return_dict is not None else self.config.use_return_dict outputs = self.transformer( input_ids, attention_mask=attention_mask, position_ids=position_ids, past_key_values=past_key_values, inputs_embeds=inputs_embeds, output_attentions=output_attentions, output_hidden_states=output_hidden_states, return_dict=return_dict, ) sequence_output = outputs[0] logits = self.qa_outputs(sequence_output) start_logits, end_logits = logits.split(1, dim=-1) start_logits = start_logits.squeeze(-1).contiguous() end_logits = end_logits.squeeze(-1).contiguous() total_loss = None if start_positions is not None and end_positions is not None: # If we are on multi-GPU, split add a dimension if len(start_positions.size()) > 1: start_positions = start_positions.squeeze(-1).to(start_logits.device) if len(end_positions.size()) > 1: end_positions = end_positions.squeeze(-1).to(end_logits.device) # sometimes the start/end positions are outside our model inputs, we ignore these terms ignored_index = start_logits.size(1) start_positions = start_positions.clamp(0, ignored_index) end_positions = end_positions.clamp(0, ignored_index) loss_fct = CrossEntropyLoss(ignore_index=ignored_index) start_loss = loss_fct(start_logits, start_positions) end_loss = loss_fct(end_logits, end_positions) total_loss = (start_loss + end_loss) / 2 if not return_dict: output = (start_logits, end_logits) + outputs[2:] return ((total_loss,) + output) if total_loss is not None else output return QuestionAnsweringModelOutput( loss=total_loss, start_logits=start_logits, end_logits=end_logits, hidden_states=outputs.hidden_states, attentions=outputs.attentions, )