import math from typing import List, Union from typing import Optional, Tuple import rotary_emb import torch import torch.utils.checkpoint import torch.utils.checkpoint from einops import rearrange from flash_attn.layers.rotary import ApplyRotaryEmbQKV_ as LegacyApplyRotaryEmbQKV_ from torch import nn from torch.nn import CrossEntropyLoss from transformers.activations import ACT2FN from transformers.modeling_outputs import BaseModelOutputWithPast, CausalLMOutputWithPast from transformers.modeling_utils import PreTrainedModel from transformers.utils import logging from .configuration_InternLM_XComposer import InternLMXComposerConfig from .modeling_utils import LoRALinear logger = logging.get_logger(__name__) _CONFIG_FOR_DOC = "InternLMXComposerConfig" class ApplyRotaryEmbQKV_(torch.autograd.Function): """ ApplyRotaryEmbQKV_ """ @staticmethod def forward(ctx, qkv, cos, sin, cos_k=None, sin_k=None): """ qkv: (total, 3, nheads, headdim) cos, sin: (seqlen, rotary_dim / 2) cos_k, sin_k: (seqlen, rotary_dim / 2), optional rotary_dim must be <= headdim Apply rotary embedding *inplace* to the first rotary_dim of q and k. """ _, three, _, headdim = qkv.shape assert three == 3 rotary_seqlen, rotary_dim = cos.shape rotary_dim *= 2 assert rotary_dim <= headdim cos_k = cos if cos_k is None else cos_k sin_k = sin if sin_k is None else sin_k assert sin.shape == cos_k.shape == sin_k.shape == (rotary_seqlen, rotary_dim // 2) q1, q2 = qkv[:, 0, :, :rotary_dim].chunk(2, dim=-1) rotary_emb.apply_rotary(q1, q2, rearrange(cos, "s d -> s 1 d"), rearrange(sin, "s d -> s 1 d"), q1, q2, False) k1, k2 = qkv[:, 1, :, :rotary_dim].chunk(2, dim=-1) rotary_emb.apply_rotary(k1, k2, rearrange(cos_k, "s d -> s 1 d"), rearrange(sin_k, "s d -> s 1 d"), k1, k2, False) ctx.save_for_backward(cos, sin, cos_k, sin_k) return qkv @staticmethod def backward(ctx, dqkv): cos, sin, cos_k, sin_k = ctx.saved_tensors rotary_dim = cos.shape[-1] rotary_dim *= 2 dq1, dq2 = dqkv[:, 0, :, :rotary_dim].chunk(2, dim=-1) rotary_emb.apply_rotary(dq1, dq2, rearrange(cos, "s d -> s 1 d"), rearrange(sin, "s d -> s 1 d"), dq1, dq2, True) dk1, dk2 = dqkv[:, 1, :, :rotary_dim].chunk(2, dim=-1) rotary_emb.apply_rotary(dk1, dk2, rearrange(cos_k, "s d -> s 1 d"), rearrange(sin_k, "s d -> s 1 d"), dk1, dk2, True) return dqkv, None, None, None, None class ConvertedInternLMRotaryEmbedding(torch.nn.Module): def __init__(self, dim: int, base=10000, scale_base=0, device=None): """ """ super().__init__() # Generate and save the inverse frequency buffer (non trainable) inv_freq = 1.0 / (base**( torch.arange(0, dim, 2, device=device, dtype=torch.float32) / dim)) self.register_buffer("inv_freq", inv_freq) self.scale_base = scale_base scale = ((torch.arange(0, dim, 2, device=device, dtype=torch.float32) + 0.4 * dim) / (1.4 * dim) if scale_base > 0 else None) self.register_buffer("scale", scale) self._seq_len_cached = 0 self._cos_cached = None self._sin_cached = None self._cos_k_cached = None self._sin_k_cached = None def _update_cos_sin_cache(self, x, indexes): """x: (batch, seqlen, nheads, headdim) or (batch, seqlen, 3, nheads, headdim)""" if not isinstance(indexes, int): seqlen = indexes.max().item() + 1 else: seqlen = indexes + 1 # eval_forward # Reset the tables if the sequence length has changed, # or if we're on a new device (possibly due to tracing for instance) if seqlen > self._seq_len_cached or self._cos_cached.device != x.device or self._cos_cached.dtype != x.dtype: self._seq_len_cached = seqlen t = torch.arange(seqlen, device=x.device, dtype=self.inv_freq.dtype) # Don't do einsum, it converts fp32 to fp16 # freqs = torch.einsum("i,j->ij", t, self.inv_freq) freqs = torch.outer(t, self.inv_freq.to(device=t.device)) if self.scale is None: self._cos_cached = torch.cos(freqs).to(x.dtype) self._sin_cached = torch.sin(freqs).to(x.dtype) else: power = (torch.arange( seqlen, dtype=self.scale.dtype, device=self.scale.device) - seqlen // 2) / self.scale_base scale = self.scale.to(device=power.device)**rearrange( power, "s -> s 1") # We want the multiplication by scale to happen in fp32 self._cos_cached = (torch.cos(freqs) * scale).to(x.dtype) self._sin_cached = (torch.sin(freqs) * scale).to(x.dtype) self._cos_k_cached = (torch.cos(freqs) / scale).to(x.dtype) self._sin_k_cached = (torch.sin(freqs) / scale).to(x.dtype) def forward(self, qkv: torch.Tensor, indexes=0) -> Tuple[torch.Tensor, torch.Tensor]: self._update_cos_sin_cache(qkv, indexes) if self.scale is None: return apply_rotary_emb_qkv_(qkv, self._cos_cached[indexes], self._sin_cached[indexes]).to( qkv.dtype) else: return apply_rotary_emb_qkv_( qkv, self._cos_cached[indexes], self._sin_cached[indexes], self._cos_k_cached[indexes], self._sin_k_cached[indexes], ).to(qkv.dtype) def eval_forward(self, qkv, seqlen_offset=0): """ seqlen_offset: can be used in generation where the qkv being passed in is only the last token in the batch. """ self._update_cos_sin_cache(qkv, seqlen_offset + qkv.shape[1]) if self.scale is None: return legacy_apply_rotary_embed_qkv( qkv, self._cos_cached[seqlen_offset:], self._sin_cached[seqlen_offset:]) else: return legacy_apply_rotary_embed_qkv( qkv, self._cos_cached[seqlen_offset:], self._sin_cached[seqlen_offset:], self._cos_k_cached[seqlen_offset:], self._sin_k_cached[seqlen_offset:], ) apply_rotary_emb_qkv_ = ApplyRotaryEmbQKV_.apply legacy_apply_rotary_embed_qkv = LegacyApplyRotaryEmbQKV_.apply class InternConvertedInternLMAttention(nn.Module): """Multi-headed attention from 'Attention Is All You Need' paper""" def __init__(self, config: InternLMXComposerConfig): super().__init__() self.config = config self.hidden_size = config.hidden_size self.num_heads = config.num_attention_heads self.head_dim = self.hidden_size // self.num_heads self.max_position_embeddings = config.max_position_embeddings if (self.head_dim * self.num_heads) != self.hidden_size: raise ValueError( f"hidden_size must be divisible by num_heads (got `hidden_size`: {self.hidden_size}" f" and `num_heads`: {self.num_heads}).") self.q_proj = nn.Linear(self.hidden_size, self.num_heads * self.head_dim, bias=config.kqvo_bias) self.k_proj = nn.Linear(self.hidden_size, self.num_heads * self.head_dim, bias=config.kqvo_bias) self.v_proj = nn.Linear(self.hidden_size, self.num_heads * self.head_dim, bias=config.kqvo_bias) self.o_proj = nn.Linear(self.num_heads * self.head_dim, self.hidden_size, bias=config.kqvo_bias) self.rotary_emb = ConvertedInternLMRotaryEmbedding(self.head_dim) def _shape(self, tensor: torch.Tensor, seq_len: int, bsz: int): return tensor.view(bsz, seq_len, self.num_heads, self.head_dim).transpose(1, 2).contiguous() 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: bool = False, use_cache: bool = False, ) -> Tuple[torch.Tensor, Optional[torch.Tensor], Optional[Tuple[torch.Tensor]]]: bsz, q_len, _ = hidden_states.size() query_states = self.q_proj(hidden_states) key_states = self.k_proj(hidden_states) value_states = self.v_proj(hidden_states) q = query_states k = key_states v = value_states qkv = torch.cat([q, k, v], dim=2).contiguous() qkv = qkv.view(bsz, q_len, -1) qkv = rearrange(qkv, "b s (three h d) -> b s three h d", three=3, d=self.head_dim) if past_key_value is not None: qkv = self.rotary_emb.eval_forward( qkv, seqlen_offset=past_key_value[0].shape[2]) else: qkv = self.rotary_emb.eval_forward(qkv) query_states, key_states, value_states = qkv.unbind(2) query_states = query_states.transpose(1, 2) key_states = key_states.transpose(1, 2) value_states = value_states.transpose(1, 2) kv_seq_len = key_states.shape[-2] if past_key_value is not None: kv_seq_len += past_key_value[0].shape[-2] # cos, sin = self.rotary_emb(value_states, seq_len=kv_seq_len) # query_states, key_states = apply_rotary_pos_emb(query_states, key_states, cos, sin, position_ids) # [bsz, nh, t, hd] if past_key_value is not None: # reuse k, v, self_attention key_states = torch.cat([past_key_value[0], key_states], dim=2) value_states = torch.cat([past_key_value[1], value_states], dim=2) past_key_value = (key_states, value_states) if use_cache else None attn_weights = torch.matmul(query_states, key_states.transpose( 2, 3)) / math.sqrt(self.head_dim) if attn_weights.size() != (bsz, self.num_heads, q_len, kv_seq_len): raise ValueError( f"Attention weights should be of size {(bsz * self.num_heads, q_len, kv_seq_len)}, but is" f" {attn_weights.size()}") if attention_mask is not None: if attention_mask.size() != (bsz, 1, q_len, kv_seq_len): raise ValueError( f"Attention mask should be of size {(bsz, 1, q_len, kv_seq_len)}, but is {attention_mask.size()}" ) attn_weights = attn_weights + attention_mask attn_weights = torch.max( attn_weights, torch.tensor(torch.finfo(attn_weights.dtype).min)) # upcast attention to fp32 attn_weights = nn.functional.softmax(attn_weights, dim=-1, dtype=torch.float32).to( query_states.dtype) attn_output = torch.matmul(attn_weights, value_states) if attn_output.size() != (bsz, self.num_heads, q_len, self.head_dim): raise ValueError( f"`attn_output` should be of size {(bsz, self.num_heads, q_len, self.head_dim)}, but is" f" {attn_output.size()}") attn_output = attn_output.transpose(1, 2) attn_output = attn_output.reshape(bsz, q_len, self.hidden_size) attn_output = self.o_proj(attn_output) if not output_attentions: attn_weights = None return attn_output, attn_weights, past_key_value # Copied from transformers.models.bart.modeling_bart._make_causal_mask def _make_causal_mask(input_ids_shape: torch.Size, dtype: torch.dtype, device: torch.device, past_key_values_length: int = 0): """ Make causal mask used for bi-directional self-attention. """ bsz, tgt_len = input_ids_shape mask = torch.full((tgt_len, tgt_len), torch.tensor(torch.finfo(dtype).min, device=device), device=device) mask_cond = torch.arange(mask.size(-1), device=device) mask.masked_fill_(mask_cond < (mask_cond + 1).view(mask.size(-1), 1), 0) mask = mask.to(dtype) if past_key_values_length > 0: mask = torch.cat([ torch.zeros( tgt_len, past_key_values_length, dtype=dtype, device=device), mask ], dim=-1) return mask[None, None, :, :].expand(bsz, 1, tgt_len, tgt_len + past_key_values_length) # 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.to(torch.bool), torch.finfo(dtype).min) class InternLMRMSNorm(nn.Module): def __init__(self, hidden_size, eps=1e-6): """ InternLMRMSNorm is equivalent to T5LayerNorm """ super().__init__() self.weight = nn.Parameter(torch.ones(hidden_size)) self.variance_epsilon = eps def forward(self, hidden_states): variance = hidden_states.to(torch.float32).pow(2).mean(-1, keepdim=True) hidden_states = hidden_states * torch.rsqrt(variance + self.variance_epsilon) # convert into half-precision if necessary if self.weight.dtype in [torch.float16, torch.bfloat16]: hidden_states = hidden_states.to(self.weight.dtype) return self.weight * hidden_states def rotate_half(x): """Rotates half the hidden dims of the input.""" x1 = x[..., :x.shape[-1] // 2] x2 = x[..., x.shape[-1] // 2:] return torch.cat((-x2, x1), dim=-1) def apply_rotary_pos_emb(q, k, cos, sin, position_ids): gather_indices = position_ids[:, None, :, None] # [bs, 1, seq_len, 1] gather_indices = gather_indices.repeat(1, cos.shape[1], 1, cos.shape[3]) cos = torch.gather(cos.repeat(gather_indices.shape[0], 1, 1, 1), 2, gather_indices) sin = torch.gather(sin.repeat(gather_indices.shape[0], 1, 1, 1), 2, gather_indices) q_embed = (q * cos) + (rotate_half(q) * sin) k_embed = (k * cos) + (rotate_half(k) * sin) return q_embed, k_embed class InternLMMLP(nn.Module): def __init__(self, hidden_size: int, intermediate_size: int, hidden_act: str, config: InternLMXComposerConfig): super().__init__() self.gate_proj = nn.Linear(hidden_size, intermediate_size, bias=False) self.down_proj = nn.Linear(intermediate_size, hidden_size, bias=False) self.up_proj = nn.Linear(hidden_size, intermediate_size, bias=False) self.act_fn = ACT2FN[hidden_act] def forward(self, x): return self.down_proj(self.act_fn(self.gate_proj(x)) * self.up_proj(x)) class InternLMDecoderLayer(nn.Module): def __init__(self, config: InternLMXComposerConfig): super().__init__() self.hidden_size = config.hidden_size self.self_attn = InternConvertedInternLMAttention(config=config) self.mlp = InternLMMLP( hidden_size=self.hidden_size, intermediate_size=config.intermediate_size, hidden_act=config.hidden_act, config=config, ) self.input_layernorm = InternLMRMSNorm(config.hidden_size, eps=config.rms_norm_eps) self.post_attention_layernorm = InternLMRMSNorm( 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, ) -> 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, 1, tgt_len, src_len)` where padding elements are indicated by very large negative values. 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 """ residual = hidden_states 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, ) 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 outputs = (hidden_states, ) if output_attentions: outputs += (self_attn_weights, ) if use_cache: outputs += (present_key_value, ) return outputs class InternLMPreTrainedModel(PreTrainedModel): config_class = InternLMXComposerConfig base_model_prefix = "model" supports_gradient_checkpointing = True _no_split_modules = ["InternLMDecoderLayer"] _keys_to_ignore_on_load_unexpected = [r"decoder\.version"] 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 _set_gradient_checkpointing(self, module, value=False): if isinstance(module, InternLMModel): module.gradient_checkpointing = value class InternLMModel(InternLMPreTrainedModel): """ Transformer decoder consisting of *config.num_hidden_layers* layers. Each layer is a [`InternLMDecoderLayer`] Args: config: InternLMXComposerConfig """ def __init__(self, config: InternLMXComposerConfig): 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.layers = nn.ModuleList([ InternLMDecoderLayer(config) for _ in range(config.num_hidden_layers) ]) self.norm = InternLMRMSNorm(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 # Copied from transformers.models.bart.modeling_bart.BartDecoder._prepare_decoder_attention_mask def _prepare_decoder_attention_mask(self, attention_mask, input_shape, inputs_embeds, past_key_values_length): # create causal mask # [bsz, seq_len] -> [bsz, 1, tgt_seq_len, src_seq_len] combined_attention_mask = None if input_shape[-1] > 1: combined_attention_mask = _make_causal_mask( input_shape, inputs_embeds.dtype, device=inputs_embeds.device, past_key_values_length=past_key_values_length, ) if attention_mask is not None: # [bsz, seq_len] -> [bsz, 1, tgt_seq_len, src_seq_len] expanded_attn_mask = _expand_mask(attention_mask, inputs_embeds.dtype, tgt_len=input_shape[-1]).to( inputs_embeds.device) combined_attention_mask = (expanded_attn_mask if combined_attention_mask is None else expanded_attn_mask + combined_attention_mask) return combined_attention_mask 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, query_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, ) -> 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 # 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: batch_size, seq_length = input_ids.shape elif inputs_embeds is not None: batch_size, seq_length, _ = inputs_embeds.shape else: raise ValueError( "You have to specify either decoder_input_ids or decoder_inputs_embeds" ) if inputs_embeds is None: inputs_embeds = self.embed_tokens(input_ids) if query_embeds is not None: inputs_embeds = torch.cat([query_embeds, inputs_embeds], dim=1) batch_size, seq_length, _ = inputs_embeds.shape seq_length_with_past = seq_length past_key_values_length = 0 if past_key_values is not None: past_key_values_length = past_key_values[0][0].shape[2] seq_length_with_past = seq_length_with_past + past_key_values_length if position_ids is None: device = input_ids.device if input_ids is not None else inputs_embeds.device position_ids = torch.arange(past_key_values_length, seq_length + past_key_values_length, dtype=torch.long, device=device) position_ids = position_ids.unsqueeze(0).view(-1, seq_length) else: position_ids = position_ids.view(-1, seq_length).long() # embed positions if attention_mask is None: attention_mask = torch.ones((batch_size, seq_length_with_past), dtype=torch.bool, device=inputs_embeds.device) attention_mask = self._prepare_decoder_attention_mask( attention_mask, (batch_size, seq_length), inputs_embeds, past_key_values_length) hidden_states = inputs_embeds if self.gradient_checkpointing and self.training: if use_cache: logger.warning_once( "`use_cache=True` is incompatible with gradient checkpointing. Setting `use_cache=False`..." ) use_cache = False # 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 for idx, decoder_layer in enumerate(self.layers): if output_hidden_states: all_hidden_states += (hidden_states, ) past_key_value = past_key_values[ idx] if past_key_values is not None else None if self.gradient_checkpointing and self.training: 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, position_ids, None, ) else: layer_outputs = decoder_layer( hidden_states, attention_mask=attention_mask, position_ids=position_ids, past_key_value=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], ) 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 = 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, ) class InternLMForCausalLM(InternLMPreTrainedModel): def __init__(self, config): super().__init__(config) # TODO: find a way to explicitly initialize InternLM if hasattr(config, 'kqvo_bias'): setattr(config, 'kqvo_bias', config.kqvo_bias) else: setattr(config, 'kqvo_bias', False) self.model = InternLMModel(config) self.lm_head = nn.Linear(config.hidden_size, config.vocab_size, bias=False) # Initialize weights and apply final processing self.post_init() @classmethod def from_pretrained(cls, pretrained_model_name_or_path, llm_cfg=None, *model_args, **kwargs): if llm_cfg: if 'torch_dtype' in kwargs: llm_cfg.torch_dtype = kwargs['torch_dtype'] if 'load_in_8bit' in kwargs: llm_cfg.load_in_8bit = kwargs['load_in_8bit'] if 'device_map' in kwargs: llm_cfg.device_map = kwargs['device_map'] return cls._from_config(llm_cfg) else: return super().from_pretrained(pretrained_model_name_or_path, *model_args, **kwargs) 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, query_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, 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, InternLMForCausalLM >>> model = InternLMForCausalLM.from_pretrained(PATH_TO_CONVERTED_WEIGHTS) >>> tokenizer = AutoTokenizer.from_pretrained(PATH_TO_CONVERTED_TOKENIZER) >>> prompt = "Hey, are you consciours? 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 consciours? Can you talk to me?\nI'm not consciours, 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, query_embeds=query_embeds, use_cache=use_cache, output_attentions=output_attentions, output_hidden_states=output_hidden_states, return_dict=return_dict, ) hidden_states = outputs[0] logits = self.lm_head(hidden_states) 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) shift_labels = shift_labels.to(shift_logits.device) # Enable model parallelism loss = loss_fct(shift_logits, shift_labels) if not return_dict: output = (logits, ) + outputs[1:] return (loss, ) + output if loss is not None else output return CausalLMOutputWithPast( 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, query_embeds=None, past_key_values=None, attention_mask=None, inputs_embeds=None, **kwargs): if past_key_values: input_ids = input_ids[:, -1:] 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[:, -1].unsqueeze(-1) query_embeds = None # 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: model_inputs = {"input_ids": input_ids} model_inputs.update({ "position_ids": position_ids, "query_embeds": query_embeds, "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) for past_state in layer_past), ) return reordered_past