import ast import random import re import time import traceback import numpy as np import torch import transformers import modules.shared as shared from modules.callbacks import (Iteratorize, Stream, _StopEverythingStoppingCriteria) from modules.extensions import apply_extensions from modules.html_generator import generate_4chan_html, generate_basic_html from modules.logging_colors import logger from modules.models import clear_torch_cache, local_rank def generate_reply(*args, **kwargs): shared.generation_lock.acquire() try: for result in _generate_reply(*args, **kwargs): yield result finally: shared.generation_lock.release() def get_max_prompt_length(state): return state['truncation_length'] - state['max_new_tokens'] def encode(prompt, add_special_tokens=True, add_bos_token=True, truncation_length=None): if shared.model.__class__.__name__ in ['LlamaCppModel', 'RWKVModel']: input_ids = shared.tokenizer.encode(str(prompt)) input_ids = np.array(input_ids).reshape(1, len(input_ids)) return input_ids else: input_ids = shared.tokenizer.encode(str(prompt), return_tensors='pt', add_special_tokens=add_special_tokens) # This is a hack for making replies more creative. if not add_bos_token and input_ids[0][0] == shared.tokenizer.bos_token_id: input_ids = input_ids[:, 1:] # Handling truncation if truncation_length is not None: input_ids = input_ids[:, -truncation_length:] if shared.model.__class__.__name__ in ['LlamaCppModel', 'RWKVModel', 'ExllamaModel'] or shared.args.cpu: return input_ids elif shared.args.flexgen: return input_ids.numpy() elif shared.args.deepspeed: return input_ids.to(device=local_rank) elif torch.has_mps: device = torch.device('mps') return input_ids.to(device) else: return input_ids.cuda() def get_encoded_length(prompt): length_after_extensions = apply_extensions('tokenized_length', prompt) if length_after_extensions is not None: return length_after_extensions return len(encode(prompt)[0]) def decode(output_ids, skip_special_tokens=True): return shared.tokenizer.decode(output_ids, skip_special_tokens) # Removes empty replies from gpt4chan outputs def fix_gpt4chan(s): for i in range(10): s = re.sub("--- [0-9]*\n>>[0-9]*\n---", "---", s) s = re.sub("--- [0-9]*\n *\n---", "---", s) s = re.sub("--- [0-9]*\n\n\n---", "---", s) return s # Fix the LaTeX equations in galactica def fix_galactica(s): s = s.replace(r'\[', r'$') s = s.replace(r'\]', r'$') s = s.replace(r'\(', r'$') s = s.replace(r'\)', r'$') s = s.replace(r'$$', r'$') s = re.sub(r'\n', r'\n\n', s) s = re.sub(r"\n{3,}", "\n\n", s) return s def get_reply_from_output_ids(output_ids, input_ids, original_question, state, is_chat=False): if shared.is_seq2seq: reply = decode(output_ids, state['skip_special_tokens']) else: new_tokens = len(output_ids) - len(input_ids[0]) reply = decode(output_ids[-new_tokens:], state['skip_special_tokens']) # Prevent LlamaTokenizer from skipping a space if type(shared.tokenizer) in [transformers.LlamaTokenizer, transformers.LlamaTokenizerFast] and len(output_ids) > 0: if shared.tokenizer.convert_ids_to_tokens(int(output_ids[-new_tokens])).startswith('▁'): reply = ' ' + reply return reply def formatted_outputs(reply, model_name): if any(s in model_name for s in ['gpt-4chan', 'gpt4chan']): reply = fix_gpt4chan(reply) return reply, generate_4chan_html(reply) else: return reply, generate_basic_html(reply) def set_manual_seed(seed): seed = int(seed) if seed == -1: seed = random.randint(1, 2**31) torch.manual_seed(seed) if torch.cuda.is_available(): torch.cuda.manual_seed_all(seed) return seed def stop_everything_event(): shared.stop_everything = True def generate_reply_wrapper(question, state, stopping_strings=None): reply = question if not shared.is_seq2seq else '' yield formatted_outputs(reply, shared.model_name) for reply in generate_reply(question, state, stopping_strings, is_chat=False): if not shared.is_seq2seq: reply = question + reply yield formatted_outputs(reply, shared.model_name) def apply_stopping_strings(reply, all_stop_strings): stop_found = False for string in all_stop_strings: idx = reply.find(string) if idx != -1: reply = reply[:idx] stop_found = True break if not stop_found: # If something like "\nYo" is generated just before "\nYou:" # is completed, trim it for string in all_stop_strings: for j in range(len(string) - 1, 0, -1): if reply[-j:] == string[:j]: reply = reply[:-j] break else: continue break return reply, stop_found def _generate_reply(question, state, stopping_strings=None, is_chat=False): generate_func = apply_extensions('custom_generate_reply') if generate_func is None: if shared.model_name == 'None' or shared.model is None: logger.error("No model is loaded! Select one in the Model tab.") yield '' return if shared.model.__class__.__name__ in ['LlamaCppModel', 'RWKVModel', 'ExllamaModel']: generate_func = generate_reply_custom elif shared.args.flexgen: generate_func = generate_reply_flexgen else: generate_func = generate_reply_HF # Preparing the input original_question = question if not is_chat: state = apply_extensions('state', state) question = apply_extensions('input', question) # Finding the stopping strings all_stop_strings = [] for st in (stopping_strings, ast.literal_eval(f"[{state['custom_stopping_strings']}]")): if type(st) is list and len(st) > 0: all_stop_strings += st if shared.args.verbose: print(f'\n\n{question}\n--------------------\n') shared.stop_everything = False clear_torch_cache() seed = set_manual_seed(state['seed']) last_update = -1 reply = '' is_stream = state['stream'] if len(all_stop_strings) > 0 and not state['stream']: state['stream'] = True for reply in generate_func(question, original_question, seed, state, stopping_strings, is_chat=is_chat): reply, stop_found = apply_stopping_strings(reply, all_stop_strings) if is_stream: cur_time = time.time() if cur_time - last_update > 0.041666666666666664: # Limit streaming to 24 fps last_update = cur_time yield reply if stop_found: break if not is_chat: reply = apply_extensions('output', reply) yield reply def generate_reply_HF(question, original_question, seed, state, stopping_strings=None, is_chat=False): generate_params = {} for k in ['max_new_tokens', 'do_sample', 'temperature', 'top_p', 'typical_p', 'repetition_penalty', 'encoder_repetition_penalty', 'top_k', 'min_length', 'no_repeat_ngram_size', 'num_beams', 'penalty_alpha', 'length_penalty', 'early_stopping', 'tfs', 'top_a', 'mirostat_mode', 'mirostat_tau', 'mirostat_eta']: generate_params[k] = state[k] for k in ['epsilon_cutoff', 'eta_cutoff']: if state[k] > 0: generate_params[k] = state[k] * 1e-4 if state['ban_eos_token']: generate_params['suppress_tokens'] = [shared.tokenizer.eos_token_id] if shared.args.no_cache: generate_params.update({'use_cache': False}) if shared.args.deepspeed: generate_params.update({'synced_gpus': True}) # Encode the input input_ids = encode(question, add_bos_token=state['add_bos_token'], truncation_length=get_max_prompt_length(state)) output = input_ids[0] cuda = not any((shared.args.cpu, shared.args.deepspeed)) # Add the encoded tokens to generate_params question, input_ids, inputs_embeds = apply_extensions('tokenizer', state, question, input_ids, None) original_input_ids = input_ids generate_params.update({'inputs': input_ids}) if inputs_embeds is not None: generate_params.update({'inputs_embeds': inputs_embeds}) # Stopping criteria / eos token eos_token_ids = [shared.tokenizer.eos_token_id] if shared.tokenizer.eos_token_id is not None else [] generate_params['eos_token_id'] = eos_token_ids generate_params['stopping_criteria'] = transformers.StoppingCriteriaList() generate_params['stopping_criteria'].append(_StopEverythingStoppingCriteria()); t0 = time.time() try: if not is_chat and not shared.is_seq2seq: yield '' # Generate the entire reply at once. if not state['stream']: with torch.no_grad(): output = shared.model.generate(**generate_params)[0] if cuda: output = output.cuda() yield get_reply_from_output_ids(output, input_ids, original_question, state, is_chat=is_chat) # Stream the reply 1 token at a time. # This is based on the trick of using 'stopping_criteria' to create an iterator. else: def generate_with_callback(callback=None, *args, **kwargs): kwargs['stopping_criteria'].append(Stream(callback_func=callback)) clear_torch_cache() with torch.no_grad(): shared.model.generate(**kwargs) def generate_with_streaming(**kwargs): return Iteratorize(generate_with_callback, [], kwargs, callback=None) with generate_with_streaming(**generate_params) as generator: for output in generator: yield get_reply_from_output_ids(output, input_ids, original_question, state, is_chat=is_chat) if output[-1] in eos_token_ids: break except Exception: traceback.print_exc() finally: t1 = time.time() original_tokens = len(original_input_ids[0]) new_tokens = len(output) - (original_tokens if not shared.is_seq2seq else 0) print(f'Output generated in {(t1-t0):.2f} seconds ({new_tokens/(t1-t0):.2f} tokens/s, {new_tokens} tokens, context {original_tokens}, seed {seed})') return def generate_reply_custom(question, original_question, seed, state, stopping_strings=None, is_chat=False): seed = set_manual_seed(state['seed']) t0 = time.time() reply = '' try: if not is_chat: yield '' if not state['stream']: reply = shared.model.generate(question, state) yield reply else: for reply in shared.model.generate_with_streaming(question, state): yield reply except Exception: traceback.print_exc() finally: t1 = time.time() original_tokens = len(encode(original_question)[0]) new_tokens = len(encode(original_question + reply)[0]) - original_tokens print(f'Output generated in {(t1-t0):.2f} seconds ({new_tokens/(t1-t0):.2f} tokens/s, {new_tokens} tokens, context {original_tokens}, seed {seed})') return def generate_reply_flexgen(question, original_question, seed, state, stopping_strings=None, is_chat=False): generate_params = {} for k in ['max_new_tokens', 'do_sample', 'temperature']: generate_params[k] = state[k] if state['stream']: generate_params['max_new_tokens'] = 8 # Encode the input input_ids = encode(question, add_bos_token=state['add_bos_token'], truncation_length=get_max_prompt_length(state)) output = input_ids[0] # Find the eos tokens eos_token_ids = [shared.tokenizer.eos_token_id] if shared.tokenizer.eos_token_id is not None else [] if not state['ban_eos_token']: generate_params['stop'] = eos_token_ids[-1] # Add the encoded tokens to generate_params question, input_ids, inputs_embeds = apply_extensions('tokenizer', state, question, input_ids, None) original_input_ids = input_ids generate_params.update({'inputs': input_ids}) if inputs_embeds is not None: generate_params.update({'inputs_embeds': inputs_embeds}) t0 = time.time() try: if not is_chat: yield '' # Generate the entire reply at once. if not state['stream']: with torch.no_grad(): output = shared.model.generate(**generate_params)[0] yield get_reply_from_output_ids(output, input_ids, original_question, state, is_chat=is_chat) # Stream the output naively for FlexGen since it doesn't support 'stopping_criteria' else: for i in range(state['max_new_tokens'] // 8 + 1): if shared.stop_everything: break clear_torch_cache() with torch.no_grad(): output = shared.model.generate(**generate_params)[0] if np.count_nonzero(np.isin(input_ids[0], eos_token_ids)) < np.count_nonzero(np.isin(output, eos_token_ids)): break yield get_reply_from_output_ids(output, original_input_ids, original_question, state) input_ids = np.reshape(output, (1, output.shape[0])) generate_params.update({'inputs': input_ids}) except Exception: traceback.print_exc() finally: t1 = time.time() original_tokens = len(original_input_ids[0]) new_tokens = len(output) - (original_tokens if not shared.is_seq2seq else 0) print(f'Output generated in {(t1-t0):.2f} seconds ({new_tokens/(t1-t0):.2f} tokens/s, {new_tokens} tokens, context {original_tokens}, seed {seed})') return