text-generation-webui/extensions/openai/script.py

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import base64
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import json
import os
import time
import requests
import yaml
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from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer
from threading import Thread
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import numpy as np
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from modules import shared
from modules.text_generation import encode, generate_reply
params = {
'port': int(os.environ.get('OPENEDAI_PORT')) if 'OPENEDAI_PORT' in os.environ else 5001,
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}
debug = True if 'OPENEDAI_DEBUG' in os.environ else False
# Optional, install the module and download the model to enable
# v1/embeddings
try:
from sentence_transformers import SentenceTransformer
except ImportError:
pass
st_model = os.environ["OPENEDAI_EMBEDDING_MODEL"] if "OPENEDAI_EMBEDDING_MODEL" in os.environ else "all-mpnet-base-v2"
embedding_model = None
standard_stopping_strings = ['\nsystem:', '\nuser:', '\nhuman:', '\nassistant:', '\n###', ]
# little helper to get defaults if arg is present but None and should be the same type as default.
def default(dic, key, default):
val = dic.get(key, default)
if type(val) != type(default):
# maybe it's just something like 1 instead of 1.0
try:
v = type(default)(val)
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if type(val)(v) == val: # if it's the same value passed in, it's ok.
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return v
except:
pass
val = default
return val
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def clamp(value, minvalue, maxvalue):
return max(minvalue, min(value, maxvalue))
def deduce_template():
# Alpaca is verbose so a good default prompt
default_template = (
"Below is an instruction that describes a task, paired with an input that provides further context. "
"Write a response that appropriately completes the request.\n\n"
"### Instruction:\n{instruction}\n\n### Input:\n{input}\n\n### Response:\n"
)
# Use the special instruction/input/response template for anything trained like Alpaca
if shared.settings['instruction_template'] in ['Alpaca', 'Alpaca-Input']:
return default_template
try:
instruct = yaml.safe_load(open(f"characters/instruction-following/{shared.settings['instruction_template']}.yaml", 'r'))
template = instruct['turn_template']
template = template\
.replace('<|user|>', instruct.get('user', ''))\
.replace('<|bot|>', instruct.get('bot', ''))\
.replace('<|user-message|>', '{instruction}\n{input}')
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return instruct.get('context', '') + template[:template.find('<|bot-message|>')].rstrip(' ')
except:
return default_template
def float_list_to_base64(float_list):
# Convert the list to a float32 array that the OpenAPI client expects
float_array = np.array(float_list, dtype="float32")
# Get raw bytes
bytes_array = float_array.tobytes()
# Encode bytes into base64
encoded_bytes = base64.b64encode(bytes_array)
# Turn raw base64 encoded bytes into ASCII
ascii_string = encoded_bytes.decode('ascii')
return ascii_string
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class Handler(BaseHTTPRequestHandler):
def do_GET(self):
if self.path.startswith('/v1/models'):
self.send_response(200)
self.send_header('Content-Type', 'application/json')
self.end_headers()
# TODO: list all models and allow model changes via API? Lora's?
# This API should list capabilities, limits and pricing...
models = [{
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"id": shared.model_name, # The real chat/completions model
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"object": "model",
"owned_by": "user",
"permission": []
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}, {
"id": st_model, # The real sentence transformer embeddings model
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"object": "model",
"owned_by": "user",
"permission": []
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}, { # these are expected by so much, so include some here as a dummy
"id": "gpt-3.5-turbo", # /v1/chat/completions
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"object": "model",
"owned_by": "user",
"permission": []
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}, {
"id": "text-curie-001", # /v1/completions, 2k context
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"object": "model",
"owned_by": "user",
"permission": []
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}, {
"id": "text-davinci-002", # /v1/embeddings text-embedding-ada-002:1536, text-davinci-002:768
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"object": "model",
"owned_by": "user",
"permission": []
}]
response = ''
if self.path == '/v1/models':
response = json.dumps({
"object": "list",
"data": models,
})
else:
the_model_name = self.path[len('/v1/models/'):]
response = json.dumps({
"id": the_model_name,
"object": "model",
"owned_by": "user",
"permission": []
})
self.wfile.write(response.encode('utf-8'))
else:
self.send_error(404)
def do_POST(self):
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if debug:
print(self.headers) # did you know... python-openai sends your linux kernel & python version?
content_length = int(self.headers['Content-Length'])
body = json.loads(self.rfile.read(content_length).decode('utf-8'))
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if debug:
print(body)
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if '/completions' in self.path or '/generate' in self.path:
is_legacy = '/generate' in self.path
is_chat = 'chat' in self.path
resp_list = 'data' if is_legacy else 'choices'
# XXX model is ignored for now
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# model = body.get('model', shared.model_name) # ignored, use existing for now
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model = shared.model_name
created_time = int(time.time())
cmpl_id = "conv-%d" % (created_time)
# Try to use openai defaults or map them to something with the same intent
stopping_strings = default(shared.settings, 'custom_stopping_strings', [])
if 'stop' in body:
if isinstance(body['stop'], str):
stopping_strings = [body['stop']]
elif isinstance(body['stop'], list):
stopping_strings = body['stop']
truncation_length = default(shared.settings, 'truncation_length', 2048)
truncation_length = clamp(default(body, 'truncation_length', truncation_length), 1, truncation_length)
default_max_tokens = truncation_length if is_chat else 16 # completions default, chat default is 'inf' so we need to cap it.
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max_tokens_str = 'length' if is_legacy else 'max_tokens'
max_tokens = default(body, max_tokens_str, default(shared.settings, 'max_new_tokens', default_max_tokens))
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# hard scale this, assuming the given max is for GPT3/4, perhaps inspect the requested model and lookup the context max
while truncation_length <= max_tokens:
max_tokens = max_tokens // 2
req_params = {
'max_new_tokens': max_tokens,
'temperature': default(body, 'temperature', 1.0),
'top_p': default(body, 'top_p', 1.0),
'top_k': default(body, 'best_of', 1),
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# XXX not sure about this one, seems to be the right mapping, but the range is different (-2..2.0) vs 0..2
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# 0 is default in openai, but 1.0 is default in other places. Maybe it's scaled? scale it.
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'repetition_penalty': 1.18, # (default(body, 'presence_penalty', 0) + 2.0 ) / 2.0, # 0 the real default, 1.2 is the model default, but 1.18 works better.
# XXX not sure about this one either, same questions. (-2..2.0), 0 is default not 1.0, scale it.
'encoder_repetition_penalty': 1.0, # (default(body, 'frequency_penalty', 0) + 2.0) / 2.0,
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'suffix': body.get('suffix', None),
'stream': default(body, 'stream', False),
'echo': default(body, 'echo', False),
#####################################################
'seed': shared.settings.get('seed', -1),
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# int(body.get('n', 1)) # perhaps this should be num_beams or chat_generation_attempts? 'n' doesn't have a direct map
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# unofficial, but it needs to get set anyways.
'truncation_length': truncation_length,
# no more args.
'add_bos_token': shared.settings.get('add_bos_token', True),
'do_sample': True,
'typical_p': 1.0,
'epsilon_cutoff': 0, # In units of 1e-4
'eta_cutoff': 0, # In units of 1e-4
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'min_length': 0,
'no_repeat_ngram_size': 0,
'num_beams': 1,
'penalty_alpha': 0.0,
'length_penalty': 1,
'early_stopping': False,
'ban_eos_token': False,
'skip_special_tokens': True,
}
# fixup absolute 0.0's
for par in ['temperature', 'repetition_penalty', 'encoder_repetition_penalty']:
req_params[par] = clamp(req_params[par], 0.001, 1.999)
self.send_response(200)
if req_params['stream']:
self.send_header('Content-Type', 'text/event-stream')
self.send_header('Cache-Control', 'no-cache')
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# self.send_header('Connection', 'keep-alive')
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else:
self.send_header('Content-Type', 'application/json')
self.end_headers()
token_count = 0
completion_token_count = 0
prompt = ''
stream_object_type = ''
object_type = ''
if is_chat:
stream_object_type = 'chat.completions.chunk'
object_type = 'chat.completions'
messages = body['messages']
system_msgs = []
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if 'prompt' in body: # Maybe they sent both? This is not documented in the API, but some clients seem to do this.
system_msgs = [ body['prompt'] ]
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chat_msgs = []
for m in messages:
role = m['role']
content = m['content']
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# name = m.get('name', 'user')
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if role == 'system':
system_msgs.extend([content.strip()])
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else:
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chat_msgs.extend([f"\n{role}: {content.strip()}"]) # Strip content? linefeed?
# You are ChatGPT, a large language model trained by OpenAI. Answer as concisely as possible. Knowledge cutoff: {knowledge_cutoff} Current date: {current_date}
system_msg = 'You are assistant, a large language model. Answer as concisely as possible.'
if system_msgs:
system_msg = '\n'.join(system_msgs)
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system_token_count = len(encode(system_msg)[0])
remaining_tokens = req_params['truncation_length'] - req_params['max_new_tokens'] - system_token_count
chat_msg = ''
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while chat_msgs:
new_msg = chat_msgs.pop()
new_size = len(encode(new_msg)[0])
if new_size <= remaining_tokens:
chat_msg = new_msg + chat_msg
remaining_tokens -= new_size
else:
# TODO: clip a message to fit?
# ie. user: ...<clipped message>
break
if len(chat_msgs) > 0:
print(f"truncating chat messages, dropping {len(chat_msgs)} messages.")
if system_msg:
prompt = 'system: ' + system_msg + '\n' + chat_msg + '\nassistant:'
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else:
prompt = chat_msg + '\nassistant:'
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token_count = len(encode(prompt)[0])
# pass with some expected stop strings.
# some strange cases of "##| Instruction: " sneaking through.
stopping_strings += standard_stopping_strings
req_params['custom_stopping_strings'] = stopping_strings
else:
stream_object_type = 'text_completion.chunk'
object_type = 'text_completion'
# ... encoded as a string, array of strings, array of tokens, or array of token arrays.
if is_legacy:
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prompt = body['context'] # Older engines.generate API
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else:
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prompt = body['prompt'] # XXX this can be different types
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if isinstance(prompt, list):
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prompt = ''.join(prompt) # XXX this is wrong... need to split out to multiple calls?
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token_count = len(encode(prompt)[0])
if token_count >= req_params['truncation_length']:
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new_len = int(len(prompt) * (float(shared.settings['truncation_length']) - req_params['max_new_tokens']) / token_count)
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prompt = prompt[-new_len:]
print(f"truncating prompt to {new_len} characters, was {token_count} tokens. Now: {len(encode(prompt)[0])} tokens.")
# pass with some expected stop strings.
# some strange cases of "##| Instruction: " sneaking through.
stopping_strings += standard_stopping_strings
req_params['custom_stopping_strings'] = stopping_strings
if req_params['stream']:
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shared.args.chat = True
# begin streaming
chunk = {
"id": cmpl_id,
"object": stream_object_type,
"created": created_time,
"model": shared.model_name,
resp_list: [{
"index": 0,
"finish_reason": None,
}],
}
if stream_object_type == 'text_completion.chunk':
chunk[resp_list][0]["text"] = ""
else:
# This is coming back as "system" to the openapi cli, not sure why.
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# So yeah... do both methods? delta and messages.
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chunk[resp_list][0]["message"] = {'role': 'assistant', 'content': ''}
chunk[resp_list][0]["delta"] = {'role': 'assistant', 'content': ''}
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# { "role": "assistant" }
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response = 'data: ' + json.dumps(chunk) + '\n'
self.wfile.write(response.encode('utf-8'))
# generate reply #######################################
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if debug:
print({'prompt': prompt, 'req_params': req_params, 'stopping_strings': stopping_strings})
generator = generate_reply(prompt, req_params, stopping_strings=stopping_strings, is_chat=False)
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answer = ''
seen_content = ''
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longest_stop_len = max([len(x) for x in stopping_strings])
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for a in generator:
answer = a
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stop_string_found = False
len_seen = len(seen_content)
search_start = max(len_seen - longest_stop_len, 0)
for string in stopping_strings:
idx = answer.find(string, search_start)
if idx != -1:
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answer = answer[:idx] # clip it.
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stop_string_found = True
if stop_string_found:
break
# If something like "\nYo" is generated just before "\nYou:"
# is completed, buffer and generate more, don't send it
buffer_and_continue = False
for string in stopping_strings:
for j in range(len(string) - 1, 0, -1):
if answer[-j:] == string[:j]:
buffer_and_continue = True
break
else:
continue
break
if buffer_and_continue:
continue
if req_params['stream']:
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# Streaming
new_content = answer[len_seen:]
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if not new_content or chr(0xfffd) in new_content: # partial unicode character, don't send it yet.
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continue
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seen_content = answer
chunk = {
"id": cmpl_id,
"object": stream_object_type,
"created": created_time,
"model": shared.model_name,
resp_list: [{
"index": 0,
"finish_reason": None,
}],
}
# strip extra leading space off new generated content
if len_seen == 0 and new_content[0] == ' ':
new_content = new_content[1:]
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if stream_object_type == 'text_completion.chunk':
chunk[resp_list][0]['text'] = new_content
else:
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# So yeah... do both methods? delta and messages.
chunk[resp_list][0]['message'] = {'content': new_content}
chunk[resp_list][0]['delta'] = {'content': new_content}
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response = 'data: ' + json.dumps(chunk) + '\n'
self.wfile.write(response.encode('utf-8'))
completion_token_count += len(encode(new_content)[0])
if req_params['stream']:
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chunk = {
"id": cmpl_id,
"object": stream_object_type,
"created": created_time,
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"model": model, # TODO: add Lora info?
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resp_list: [{
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"index": 0,
"finish_reason": "stop",
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}],
"usage": {
"prompt_tokens": token_count,
"completion_tokens": completion_token_count,
"total_tokens": token_count + completion_token_count
}
}
if stream_object_type == 'text_completion.chunk':
chunk[resp_list][0]['text'] = ''
else:
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# So yeah... do both methods? delta and messages.
chunk[resp_list][0]['message'] = {'content': ''}
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chunk[resp_list][0]['delta'] = {}
response = 'data: ' + json.dumps(chunk) + '\ndata: [DONE]\n'
self.wfile.write(response.encode('utf-8'))
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# Finished if streaming.
if debug:
if answer and answer[0] == ' ':
answer = answer[1:]
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print({'response': answer})
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return
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# strip extra leading space off new generated content
if answer and answer[0] == ' ':
answer = answer[1:]
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if debug:
print({'response': answer})
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completion_token_count = len(encode(answer)[0])
stop_reason = "stop"
if token_count + completion_token_count >= req_params['truncation_length']:
stop_reason = "length"
resp = {
"id": cmpl_id,
"object": object_type,
"created": created_time,
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"model": model, # TODO: add Lora info?
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resp_list: [{
"index": 0,
"finish_reason": stop_reason,
}],
"usage": {
"prompt_tokens": token_count,
"completion_tokens": completion_token_count,
"total_tokens": token_count + completion_token_count
}
}
if is_chat:
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resp[resp_list][0]["message"] = {"role": "assistant", "content": answer}
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else:
resp[resp_list][0]["text"] = answer
response = json.dumps(resp)
self.wfile.write(response.encode('utf-8'))
elif '/edits' in self.path:
self.send_response(200)
self.send_header('Content-Type', 'application/json')
self.end_headers()
created_time = int(time.time())
# Using Alpaca format, this may work with other models too.
instruction = body['instruction']
input = body.get('input', '')
instruction_template = deduce_template()
edit_task = instruction_template.format(instruction=instruction, input=input)
truncation_length = default(shared.settings, 'truncation_length', 2048)
token_count = len(encode(edit_task)[0])
max_tokens = truncation_length - token_count
req_params = {
'max_new_tokens': max_tokens,
'temperature': clamp(default(body, 'temperature', 1.0), 0.001, 1.999),
'top_p': clamp(default(body, 'top_p', 1.0), 0.001, 1.0),
'top_k': 1,
'repetition_penalty': 1.18,
'encoder_repetition_penalty': 1.0,
'suffix': None,
'stream': False,
'echo': False,
'seed': shared.settings.get('seed', -1),
# 'n' : default(body, 'n', 1), # 'n' doesn't have a direct map
'truncation_length': truncation_length,
'add_bos_token': shared.settings.get('add_bos_token', True),
'do_sample': True,
'typical_p': 1.0,
'epsilon_cutoff': 0, # In units of 1e-4
'eta_cutoff': 0, # In units of 1e-4
'min_length': 0,
'no_repeat_ngram_size': 0,
'num_beams': 1,
'penalty_alpha': 0.0,
'length_penalty': 1,
'early_stopping': False,
'ban_eos_token': False,
'skip_special_tokens': True,
'custom_stopping_strings': [],
}
if debug:
print({'edit_template': edit_task, 'req_params': req_params, 'token_count': token_count})
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generator = generate_reply(edit_task, req_params, stopping_strings=standard_stopping_strings, is_chat=False)
answer = ''
for a in generator:
answer = a
# some reply's have an extra leading space to fit the instruction template, just clip it off from the reply.
if edit_task[-1] != '\n' and answer and answer[0] == ' ':
answer = answer[1:]
completion_token_count = len(encode(answer)[0])
resp = {
"object": "edit",
"created": created_time,
"choices": [{
"text": answer,
"index": 0,
}],
"usage": {
"prompt_tokens": token_count,
"completion_tokens": completion_token_count,
"total_tokens": token_count + completion_token_count
}
}
if debug:
print({'answer': answer, 'completion_token_count': completion_token_count})
response = json.dumps(resp)
self.wfile.write(response.encode('utf-8'))
elif '/images/generations' in self.path and 'SD_WEBUI_URL' in os.environ:
# Stable Diffusion callout wrapper for txt2img
# Low effort implementation for compatibility. With only "prompt" being passed and assuming DALL-E
# the results will be limited and likely poor. SD has hundreds of models and dozens of settings.
# If you want high quality tailored results you should just use the Stable Diffusion API directly.
# it's too general an API to try and shape the result with specific tags like "masterpiece", etc,
# Will probably work best with the stock SD models.
# SD configuration is beyond the scope of this API.
# At this point I will not add the edits and variations endpoints (ie. img2img) because they
# require changing the form data handling to accept multipart form data, also to properly support
# url return types will require file management and a web serving files... Perhaps later!
self.send_response(200)
self.send_header('Content-Type', 'application/json')
self.end_headers()
width, height = [ int(x) for x in default(body, 'size', '1024x1024').split('x') ] # ignore the restrictions on size
response_format = default(body, 'response_format', 'url') # or b64_json
payload = {
'prompt': body['prompt'], # ignore prompt limit of 1000 characters
'width': width,
'height': height,
'batch_size': default(body, 'n', 1) # ignore the batch limits of max 10
}
resp = {
'created': int(time.time()),
'data': []
}
# TODO: support SD_WEBUI_AUTH username:password pair.
sd_url = f"{os.environ['SD_WEBUI_URL']}/sdapi/v1/txt2img"
response = requests.post(url=sd_url, json=payload)
r = response.json()
# r['parameters']...
for b64_json in r['images']:
if response_format == 'b64_json':
resp['data'].extend([{'b64_json': b64_json}])
else:
resp['data'].extend([{'url': f'data:image/png;base64,{b64_json}'}]) # yeah it's lazy. requests.get() will not work with this
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response = json.dumps(resp)
self.wfile.write(response.encode('utf-8'))
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elif '/embeddings' in self.path and embedding_model is not None:
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self.send_response(200)
self.send_header('Content-Type', 'application/json')
self.end_headers()
input = body['input'] if 'input' in body else body['text']
if type(input) is str:
input = [input]
embeddings = embedding_model.encode(input).tolist()
def enc_emb(emb):
# If base64 is specified, encode. Otherwise, do nothing.
if body.get("encoding_format", "") == "base64":
return float_list_to_base64(emb)
else:
return emb
data = [{"object": "embedding", "embedding": enc_emb(emb), "index": n} for n, emb in enumerate(embeddings)]
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response = json.dumps({
"object": "list",
"data": data,
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"model": st_model, # return the real model
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"usage": {
"prompt_tokens": 0,
"total_tokens": 0,
}
})
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if debug:
print(f"Embeddings return size: {len(embeddings[0])}, number: {len(embeddings)}")
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self.wfile.write(response.encode('utf-8'))
elif '/moderations' in self.path:
# for now do nothing, just don't error.
self.send_response(200)
self.send_header('Content-Type', 'application/json')
self.end_headers()
response = json.dumps({
"id": "modr-5MWoLO",
"model": "text-moderation-001",
"results": [{
"categories": {
"hate": False,
"hate/threatening": False,
"self-harm": False,
"sexual": False,
"sexual/minors": False,
"violence": False,
"violence/graphic": False
},
"category_scores": {
"hate": 0.0,
"hate/threatening": 0.0,
"self-harm": 0.0,
"sexual": 0.0,
"sexual/minors": 0.0,
"violence": 0.0,
"violence/graphic": 0.0
},
"flagged": False
}]
})
self.wfile.write(response.encode('utf-8'))
elif self.path == '/api/v1/token-count':
# NOT STANDARD. lifted from the api extension, but it's still very useful to calculate tokenized length client side.
self.send_response(200)
self.send_header('Content-Type', 'application/json')
self.end_headers()
tokens = encode(body['prompt'])[0]
response = json.dumps({
'results': [{
'tokens': len(tokens)
}]
})
self.wfile.write(response.encode('utf-8'))
else:
print(self.path, self.headers)
self.send_error(404)
def run_server():
global embedding_model
try:
embedding_model = SentenceTransformer(st_model)
print(f"\nLoaded embedding model: {st_model}, max sequence length: {embedding_model.max_seq_length}")
except:
print(f"\nFailed to load embedding model: {st_model}")
pass
server_addr = ('0.0.0.0' if shared.args.listen else '127.0.0.1', params['port'])
server = ThreadingHTTPServer(server_addr, Handler)
if shared.args.share:
try:
from flask_cloudflared import _run_cloudflared
public_url = _run_cloudflared(params['port'], params['port'] + 1)
print(f'Starting OpenAI compatible api at\nOPENAI_API_BASE={public_url}/v1')
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except ImportError:
print('You should install flask_cloudflared manually')
else:
print(f'Starting OpenAI compatible api:\nOPENAI_API_BASE=http://{server_addr[0]}:{server_addr[1]}/v1')
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server.serve_forever()
def setup():
Thread(target=run_server, daemon=True).start()