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# -*- coding: utf-8 -*-
"""StripedHyena custom code port for the Hugging Face Hub"""
import torch
from torch.nn import functional as F
from .configuration_hyena import StripedHyenaConfig
from transformers import PreTrainedModel
from transformers.modeling_outputs import CausalLMOutput, CausalLMOutputWithPast
from transformers.utils import logging
from typing import Optional, Tuple, Union
from .model import StripedHyena
from .utils import dotdict
from .cache import InferenceParams
from .engine import HyenaInferenceEngine
from .layers import RMSNorm
from .utils import dotdict, column_split
logger = logging.get_logger(__name__)
class StripedHyenaPreTrainedModel(PreTrainedModel):
config_class = StripedHyenaConfig
base_model_prefix = "sh"
supports_gradient_checkpointing = False
_no_split_modules = ["AttentionBlock", "ParallelGatedConvBlock"]
_skip_keys_device_placement = "past_key_values"
_keys_to_ignore_on_load_missing = [r"freq"]
_keys_to_ignore_on_load_unexpected = [r"fftconv", r"twiddle_factors"]
_supports_flash_attn_2 = True
class StripedHyenaModelForCausalLM(StripedHyenaPreTrainedModel):
supports_gradient_checkpointing = True
def __init__(self, config, **kwargs):
super().__init__(config, **kwargs)
model_config = dotdict(config.to_dict())
self.backbone = StripedHyena(model_config)
self.backbone.gradient_checkpointing = False
self.config = config
vocab_size = config.vocab_size
if vocab_size % config.make_vocab_size_divisible_by != 0:
vocab_size += config.make_vocab_size_divisible_by - (
vocab_size % config.make_vocab_size_divisible_by
)
self.vocab_size = vocab_size
self.post_init()
self.force_dtype()
def force_dtype(self):
self.backbone.to_bfloat16_except_poles_residues()
def _set_gradient_checkpointing(self, enable, gradient_checkpointing_func):
self.backbone.gradient_checkpointing = enable
def get_input_embeddings(self):
return self.backbone.embedding_layer
def forward(
self,
input_ids: torch.LongTensor = None,
attention_mask: Optional[torch.LongTensor] = None,
labels: Optional[torch.LongTensor] = None,
use_cache: Optional[bool] = None,
output_attentions: Optional[bool] = None,
output_hidden_states: Optional[bool] = None,
past_key_values=None,
return_dict: Optional[bool] = None,
) -> Union[Tuple, CausalLMOutputWithPast]:
return_dict = return_dict if return_dict is not None else self.config.use_return_dict
use_cache = use_cache if use_cache is not None else self.config.use_cache
if use_cache:
if self.backbone.gradient_checkpointing and self.backbone.training:
logger.warning_once(
"`use_cache=True` is incompatible with gradient checkpointing. Setting `use_cache=False`..."
)
use_cache = False
elif labels is not None:
logger.warning_once(
"`use_cache=True` is incompatible with loss calculation. Setting `use_cache=False`..."
)
use_cache = False
inputs = input_ids
if use_cache:
if past_key_values is None:
past_key_values = self.backbone.initialize_inference_params()
batch_size = input_ids.shape[0]
past_key_values["mha"].max_batch_size = batch_size
past_key_values["hyena"].max_batch_size = batch_size
else:
seqlen_offset = past_key_values["mha"].seqlen_offset
if seqlen_offset == 0:
# second loop through generate will have prompt_len + 1 as seqlen
seqlen_offset = input_ids.shape[-1] - 1
past_key_values["hyena"].seqlen_offset = seqlen_offset
past_key_values["mha"].seqlen_offset = seqlen_offset
else:
past_key_values["mha"].seqlen_offset += 1
past_key_values["hyena"].seqlen_offset += 1
inputs = input_ids[
:,
-1:,
]
logits, past_key_values = self.backbone(
inputs,
padding_mask=attention_mask,
inference_params_dict=past_key_values if use_cache else None,
)
loss = None
if labels is not None:
shift_logits = logits[..., :-1, :].contiguous()
shift_labels = labels[..., 1:].contiguous()
shift_logits = shift_logits.view(-1, self.config.vocab_size)
shift_labels = shift_labels.view(-1)
shift_labels = shift_labels.to(shift_logits.device)
loss = F.cross_entropy(shift_logits, shift_labels)
if return_dict:
return CausalLMOutputWithPast(
logits=logits,
hidden_states=None,
past_key_values=past_key_values if use_cache else None,
loss=loss,
)
else:
return logits
@classmethod
def can_generate(cls) -> bool:
return True
def prepare_inputs_for_generation(
self, input_ids, attention_mask=None, past_key_values=None, **kwargs
):
return {
"input_ids": input_ids,
"attention_mask": attention_mask,
"past_key_values": past_key_values,
}
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