Two new options: truncation length and ban eos token

modules/chat.py

@@ -18,35 +18,35 @@ from modules.text_generation import (encode, generate_reply,
                                      get_max_prompt_length)
 
 
-def generate_chat_prompt(user_input, max_new_tokens, name1, name2, context, chat_prompt_size, **kwargs):
+def generate_chat_prompt(user_input, state, **kwargs):
-    is_instruct = kwargs['is_instruct'] if 'is_instruct' in kwargs else False
-    end_of_turn = kwargs['end_of_turn'] if 'end_of_turn' in kwargs else ''
     impersonate = kwargs['impersonate'] if 'impersonate' in kwargs else False
     _continue = kwargs['_continue'] if '_continue' in kwargs else False
     also_return_rows = kwargs['also_return_rows'] if 'also_return_rows' in kwargs else False
-    rows = [f"{context.strip()}\n"]
+    is_instruct = state['mode'] == 'instruct'
+    rows = [f"{state['context'].strip()}\n"]
 
     # Finding the maximum prompt size
+    chat_prompt_size = state['chat_prompt_size']
     if shared.soft_prompt:
         chat_prompt_size -= shared.soft_prompt_tensor.shape[1]
-    max_length = min(get_max_prompt_length(max_new_tokens), chat_prompt_size)
+    max_length = min(get_max_prompt_length(state), chat_prompt_size)
 
     if is_instruct:
-        prefix1 = f"{name1}\n"
+        prefix1 = f"{state['name1']}\n"
-        prefix2 = f"{name2}\n"
+        prefix2 = f"{state['name2']}\n"
     else:
-        prefix1 = f"{name1}: "
+        prefix1 = f"{state['name1']}: "
-        prefix2 = f"{name2}: "
+        prefix2 = f"{state['name2']}: "
 
     i = len(shared.history['internal']) - 1
-    while i >= 0 and len(encode(''.join(rows), max_new_tokens)[0]) < max_length:
+    while i >= 0 and len(encode(''.join(rows))[0]) < max_length:
         if _continue and i == len(shared.history['internal']) - 1:
             rows.insert(1, f"{prefix2}{shared.history['internal'][i][1]}")
         else:
-            rows.insert(1, f"{prefix2}{shared.history['internal'][i][1].strip()}{end_of_turn}\n")
+            rows.insert(1, f"{prefix2}{shared.history['internal'][i][1].strip()}{state['end_of_turn']}\n")
         string = shared.history['internal'][i][0]
         if string not in ['', '<|BEGIN-VISIBLE-CHAT|>']:
-            rows.insert(1, f"{prefix1}{string.strip()}{end_of_turn}\n")
+            rows.insert(1, f"{prefix1}{string.strip()}{state['end_of_turn']}\n")
         i -= 1
 
     if impersonate:
@@ -58,13 +58,13 @@ def generate_chat_prompt(user_input, max_new_tokens, name1, name2, context, chat
         # Adding the user message
         user_input = fix_newlines(user_input)
         if len(user_input) > 0:
-            rows.append(f"{prefix1}{user_input}{end_of_turn}\n")
+            rows.append(f"{prefix1}{user_input}{state['end_of_turn']}\n")
 
         # Adding the Character prefix
         rows.append(apply_extensions(f"{prefix2.strip() if not is_instruct else prefix2}", "bot_prefix"))
         limit = 3
 
-    while len(rows) > limit and len(encode(''.join(rows), max_new_tokens)[0]) >= max_length:
+    while len(rows) > limit and len(encode(''.join(rows))[0]) >= max_length:
         rows.pop(1)
     prompt = ''.join(rows)
 
@@ -139,15 +139,10 @@ def chatbot_wrapper(text, state, regenerate=False, _continue=False):
         text = apply_extensions(text, "input")
 
     # Generating the prompt
-    kwargs = {
-        'end_of_turn': state['end_of_turn'],
-        'is_instruct': state['mode'] == 'instruct',
-        '_continue': _continue
-    }
     if custom_generate_chat_prompt is None:
-        prompt = generate_chat_prompt(text, state['max_new_tokens'], state['name1'], state['name2'], state['context'], state['chat_prompt_size'], **kwargs)
+        prompt = generate_chat_prompt(text, state)
     else:
-        prompt = custom_generate_chat_prompt(text, state['max_new_tokens'], state['name1'], state['name2'], state['context'], state['chat_prompt_size'], **kwargs)
+        prompt = custom_generate_chat_prompt(text, state)
 
     # Yield *Is typing...*
     if not any((regenerate, _continue)):
@@ -197,7 +192,7 @@ def impersonate_wrapper(text, state):
     # Defining some variables
     cumulative_reply = ''
     eos_token = '\n' if state['stop_at_newline'] else None
-    prompt = generate_chat_prompt(text, state['max_new_tokens'], state['name1'], state['name2'], state['context'], state['chat_prompt_size'], end_of_turn=state['end_of_turn'], impersonate=True)
+    prompt = generate_chat_prompt(text, state, impersonate=True)
     stopping_strings = get_stopping_strings(state)
 
     # Yield *Is typing...*

modules/models.py

@@ -189,7 +189,6 @@ def load_model(model_name):
             pass
     else:
         tokenizer = AutoTokenizer.from_pretrained(Path(f"{shared.args.model_dir}/{shared.model_name}/"))
-    tokenizer.truncation_side = 'left'
 
     print(f"Loaded the model in {(time.time()-t0):.2f} seconds.")
     return model, tokenizer

modules/shared.py

@@ -37,6 +37,10 @@ settings = {
     'custom_stopping_strings': '',
     'stop_at_newline': False,
     'add_bos_token': True,
+    'ban_eos_token': False,
+    'truncation_length': 2048,
+    'truncation_length_min': 0,
+    'truncation_length_max': 4096,
     'chat_prompt_size': 2048,
     'chat_prompt_size_min': 0,
     'chat_prompt_size_max': 2048,

modules/text_generation.py

@@ -15,20 +15,20 @@ from modules.html_generator import generate_4chan_html, generate_basic_html
 from modules.models import clear_torch_cache, local_rank
 
 
-def get_max_prompt_length(tokens):
+def get_max_prompt_length(state):
-    max_length = 2048 - tokens
+    max_length = state['truncation_length'] - state['max_new_tokens']
     if shared.soft_prompt:
         max_length -= shared.soft_prompt_tensor.shape[1]
     return max_length
 
 
-def encode(prompt, tokens_to_generate=0, add_special_tokens=True, add_bos_token=True):
+def encode(prompt, add_special_tokens=True, add_bos_token=True, truncation_length=None):
     if any((shared.is_RWKV, shared.is_llamacpp)):
         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', truncation=True, max_length=get_max_prompt_length(tokens_to_generate), add_special_tokens=add_special_tokens)
+        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:
@@ -39,7 +39,11 @@ def encode(prompt, tokens_to_generate=0, add_special_tokens=True, add_bos_token=
         if type(shared.tokenizer) is transformers.LlamaTokenizer and input_ids[0][0] == 29871:
             input_ids = input_ids[:, 1:]
 
-        if shared.args.cpu:
+    # Handling truncation
+    if truncation_length is not None:
+        input_ids = input_ids[:, -truncation_length:]
+
+    if any((shared.is_RWKV, shared.is_llamacpp, shared.args.cpu)):
         return input_ids
     elif shared.args.flexgen:
         return input_ids.numpy()
@@ -129,12 +133,14 @@ def generate_reply(question, state, eos_token=None, stopping_strings=[]):
     original_question = question
     if not shared.is_chat():
         question = apply_extensions(question, 'input')
-    if shared.args.verbose:
-        print(f'\n\n{question}\n--------------------\n')
 
     # These models are not part of Hugging Face, so we handle them
     # separately and terminate the function call earlier
     if any((shared.is_RWKV, shared.is_llamacpp)):
+
+        if shared.args.verbose:
+            print(f'\n\n{question}\n--------------------\n')
+
         for k in ['temperature', 'top_p', 'top_k', 'repetition_penalty']:
             generate_params[k] = state[k]
         generate_params['token_count'] = state['max_new_tokens']
@@ -166,10 +172,13 @@ def generate_reply(question, state, eos_token=None, stopping_strings=[]):
             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
 
-    input_ids = encode(question, state['max_new_tokens'], add_bos_token=state['add_bos_token'])
+    input_ids = encode(question, add_bos_token=state['add_bos_token'], truncation_length=get_max_prompt_length(state))
     original_input_ids = input_ids
     output = input_ids[0]
 
+    if shared.args.verbose:
+        print(f'\n\n{decode(input_ids[0])}\n--------------------\n')
+
     cuda = not any((shared.args.cpu, shared.args.deepspeed, shared.args.flexgen))
     eos_token_ids = [shared.tokenizer.eos_token_id] if shared.tokenizer.eos_token_id is not None else []
     if eos_token is not None:
@@ -179,7 +188,7 @@ def generate_reply(question, state, eos_token=None, stopping_strings=[]):
     stopping_criteria_list = transformers.StoppingCriteriaList()
     for st in [stopping_strings, state['custom_stopping_strings']]:
         if type(st) is list and len(st) > 0:
-            sentinel_token_ids = [encode(string, 0, add_special_tokens=False) for string in st]
+            sentinel_token_ids = [encode(string, add_special_tokens=False) for string in st]
             stopping_criteria_list.append(_SentinelTokenStoppingCriteria(sentinel_token_ids=sentinel_token_ids, starting_idx=len(input_ids[0])))
             break
 
@@ -188,6 +197,8 @@ def generate_reply(question, state, eos_token=None, stopping_strings=[]):
             generate_params[k] = state[k]
         generate_params['eos_token_id'] = eos_token_ids
         generate_params['stopping_criteria'] = stopping_criteria_list
+        if state['ban_eos_token']:
+            generate_params['suppress_tokens'] = [shared.tokenizer.eos_token_id]
     else:
         for k in ['max_new_tokens', 'do_sample', 'temperature']:
             generate_params[k] = state[k]

server.py

@@ -263,7 +263,7 @@ def create_settings_menus(default_preset):
             with gr.Box():
                 gr.Markdown('Contrastive search')
                 shared.gradio['penalty_alpha'] = gr.Slider(0, 5, value=generate_params['penalty_alpha'], label='penalty_alpha')
-            with gr.Box():
+
                 gr.Markdown('Beam search (uses a lot of VRAM)')
                 with gr.Row():
                     with gr.Column():
@@ -272,10 +272,11 @@ def create_settings_menus(default_preset):
                         shared.gradio['length_penalty'] = gr.Slider(-5, 5, value=generate_params['length_penalty'], label='length_penalty')
                 shared.gradio['early_stopping'] = gr.Checkbox(value=generate_params['early_stopping'], label='early_stopping')
 
+            with gr.Group():
                 with gr.Row():
                     shared.gradio['add_bos_token'] = gr.Checkbox(value=shared.settings['add_bos_token'], label='Add the bos_token to the beginning of prompts', info='Disabling this can make the replies more creative.')
-
+                    shared.gradio['ban_eos_token'] = gr.Checkbox(value=shared.settings['ban_eos_token'], label='Ban the eos token', info='This forces the model to never end the generation prematurely.')
-            with gr.Row():
+                shared.gradio['truncation_length'] = gr.Slider(value=shared.settings['truncation_length'], minimum=shared.settings['truncation_length_min'], maximum=shared.settings['truncation_length_max'], step=1, label='Truncate the prompt up to this length', info='The leftmost tokens are removed if the prompt exceeds this length. Most models require this to be at most 2048.')
                 shared.gradio['custom_stopping_strings'] = gr.Textbox(lines=1, value=shared.settings["custom_stopping_strings"] or None, label='Custom stopping strings', info='In addition to the defaults. Written between "" and separated by commas. For instance: "\\nYour Assistant:", "\\nThe assistant:"')
 
     with gr.Accordion('Soft prompt', open=False):
@@ -361,7 +362,7 @@ title = 'Text generation web UI'
 
 
 def list_interface_input_elements(chat=False):
-    elements = ['max_new_tokens', 'seed', 'temperature', 'top_p', 'top_k', 'typical_p', 'repetition_penalty', 'encoder_repetition_penalty', 'no_repeat_ngram_size', 'min_length', 'do_sample', 'penalty_alpha', 'num_beams', 'length_penalty', 'early_stopping', 'add_bos_token', 'custom_stopping_strings']
+    elements = ['max_new_tokens', 'seed', 'temperature', 'top_p', 'top_k', 'typical_p', 'repetition_penalty', 'encoder_repetition_penalty', 'no_repeat_ngram_size', 'min_length', 'do_sample', 'penalty_alpha', 'num_beams', 'length_penalty', 'early_stopping', 'add_bos_token', 'ban_eos_token', 'truncation_length', 'custom_stopping_strings']
     if chat:
         elements += ['name1', 'name2', 'greeting', 'context', 'end_of_turn', 'chat_prompt_size', 'chat_generation_attempts', 'stop_at_newline', 'mode']
     return elements

settings-template.json

@@ -11,6 +11,10 @@
     "custom_stopping_strings": "",
     "stop_at_newline": false,
     "add_bos_token": true,
+    "ban_eos_token": true,
+    "truncation_length": 2048,
+    "truncation_length_min": 0,
+    "truncation_length_max": 4096,
     "chat_prompt_size": 2048,
     "chat_prompt_size_min": 0,
     "chat_prompt_size_max": 2048,