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Optimize ExLlamav2 (non-HF) loader

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oobabooga 2023-12-20 07:31:42 -08:00
parent 258c695ead
commit b15f510154
1 changed files with 8 additions and 28 deletions
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36
modules/exllamav2.py
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@ -1,4 +1,3 @@
import random
import traceback
from pathlib import Path
@ -10,7 +9,7 @@ from exllamav2 import (
ExLlamaV2Config,
ExLlamaV2Tokenizer
)
from exllamav2.generator import ExLlamaV2BaseGenerator, ExLlamaV2Sampler
from exllamav2.generator import ExLlamaV2Sampler, ExLlamaV2StreamingGenerator
from modules import shared
from modules.logging_colors import logger
@ -64,7 +63,7 @@ class Exllamav2Model:
else:
cache = ExLlamaV2Cache(model)
generator = ExLlamaV2BaseGenerator(model, cache, tokenizer)
generator = ExLlamaV2StreamingGenerator(model, cache, tokenizer)
result = self()
result.model = model
@ -115,41 +114,22 @@ class Exllamav2Model:
ids = self.tokenizer.encode(prompt, add_bos=state['add_bos_token'], encode_special_tokens=True)
ids = ids[:, -get_max_prompt_length(state):]
initial_len = ids.shape[-1]
if state['auto_max_new_tokens']:
max_new_tokens = state['truncation_length'] - ids.shape[-1]
else:
max_new_tokens = state['max_new_tokens']
# _gen_begin_base
self.cache.current_seq_len = 0
self.model.forward(ids[:, :-1], self.cache, input_mask=None, preprocess_only=True, loras=self.loras)
self.generator.set_stop_conditions([])
self.generator.begin_stream(ids, settings, loras=self.loras)
has_leading_space = False
decoded_text = ''
for i in range(max_new_tokens):
logits = self.model.forward(ids[:, -1:], self.cache, input_mask=None, loras=self.loras).float().cpu()
token, _, _ = ExLlamaV2Sampler.sample(logits, settings, ids, random.random(), self.tokenizer)
ids = torch.cat([ids, token], dim=1)
if i == 0 and self.tokenizer.tokenizer.id_to_piece(int(token)).startswith('▁'):
has_leading_space = True
decoded_text = self.tokenizer.decode(ids[:, initial_len:], decode_special_tokens=not state['skip_special_tokens'])[0]
if has_leading_space:
decoded_text = ' ' + decoded_text
# Check the partial unicode character
if chr(0xfffd) in decoded_text:
is_last = i == max_new_tokens - 1
is_stopping = token.item() == self.tokenizer.eos_token_id or shared.stop_everything
# If we are not at the end of the generation, we skip this token
if not (is_last or is_stopping):
continue
if token.item() == self.tokenizer.eos_token_id or shared.stop_everything:
chunk, eos, _ = self.generator.stream()
if eos or shared.stop_everything:
break
decoded_text += chunk
yield decoded_text
def generate(self, prompt, state):