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predict.py

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+"""
+Copied from https://github.com/lm-sys/FastChat.
+Later we will contribute our changes into it.
+"""
+import dataclasses
+from enum import auto, IntEnum
+from typing import List, Any, Dict
+import math
+from typing import List, Optional, Tuple, Union
+import random
+import numpy as np
+
+import torch
+import torch.utils.checkpoint
+from torch import nn
+from torch.nn import BCEWithLogitsLoss, CrossEntropyLoss, MSELoss
+
+from transformers.activations import ACT2FN
+from transformers.modeling_outputs import BaseModelOutputWithPast, CausalLMOutputWithPast, SequenceClassifierOutputWithPast
+from transformers.modeling_utils import PreTrainedModel
+from transformers.utils import add_start_docstrings, add_start_docstrings_to_model_forward, logging, replace_return_docstrings
+from transformers import (
+    LogitsProcessorList,
+    MinLengthLogitsProcessor,
+    TopKLogitsWarper,
+    TemperatureLogitsWarper,
+    TopPLogitsWarper,
+    StoppingCriteriaList,
+    MaxLengthCriteria,
+    BitsAndBytesConfig,
+)
+
+
+
+class SeparatorStyle(IntEnum):
+    """Separator styles."""
+
+    ADD_COLON_SINGLE = auto()
+    ADD_COLON_TWO = auto()
+    ADD_COLON_SPACE_SINGLE = auto()
+    NO_COLON_SINGLE = auto()
+    NO_COLON_TWO = auto()
+    ADD_NEW_LINE_SINGLE = auto()
+
+
+@dataclasses.dataclass
+class Conversation:
+    """A class that manages prompt templates and keeps all conversation history."""
+
+    # The name of this template
+    name: str
+    # The template of the system prompt
+    system_template: str = "{system_message}"
+    # The system message
+    system_message: str = ""
+    # The names of two roles
+    roles: List[str] = (("USER", "ASSISTANT"),)
+    # All messages. Each item is (role, message).
+    messages: List[List[str]] = ()
+    # The number of few shot examples
+    offset: int = 0
+    # The separator style and configurations
+    sep_style: SeparatorStyle = SeparatorStyle.ADD_COLON_SINGLE
+    sep: str = "\n"
+    sep2: str = None
+    # Stop criteria (the default one is EOS token)
+    stop_str: str = None
+    # Stops generation if meeting any token in this list
+    stop_token_ids: List[int] = None
+
+    def get_prompt(self) -> str:
+        """Get the prompt for generation."""
+        system_prompt = self.system_template.format(system_message=self.system_message)
+        if self.sep_style == SeparatorStyle.ADD_COLON_SINGLE:
+            ret = system_prompt + self.sep
+            for role, message in self.messages:
+                if message:
+                    ret += role + ": " + message + self.sep
+                else:
+                    ret += role + ":"
+            return ret
+        elif self.sep_style == SeparatorStyle.ADD_COLON_TWO:
+            seps = [self.sep, self.sep2]
+            ret = system_prompt + seps[0]
+            for i, (role, message) in enumerate(self.messages):
+                if message:
+                    ret += role + ": " + message + seps[i % 2]
+                else:
+                    ret += role + ":"
+            return ret
+        elif self.sep_style == SeparatorStyle.ADD_COLON_SPACE_SINGLE:
+            ret = system_prompt + self.sep
+            for role, message in self.messages:
+                if message:
+                    ret += role + ": " + message + self.sep
+                else:
+                    ret += role + ": "  # must be end with a space
+            return ret
+        elif self.sep_style == SeparatorStyle.ADD_NEW_LINE_SINGLE:
+            ret = "" if system_prompt == "" else system_prompt + self.sep
+            for role, message in self.messages:
+                if message:
+                    ret += role + "\n" + message + self.sep
+                else:
+                    ret += role + "\n"
+            return ret
+        elif self.sep_style == SeparatorStyle.NO_COLON_SINGLE:
+            ret = system_prompt
+            for role, message in self.messages:
+                if message:
+                    ret += role + message + self.sep
+                else:
+                    ret += role
+            return ret
+        elif self.sep_style == SeparatorStyle.NO_COLON_TWO:
+            seps = [self.sep, self.sep2]
+            ret = system_prompt
+            for i, (role, message) in enumerate(self.messages):
+                if message:
+                    ret += role + message + seps[i % 2]
+                else:
+                    ret += role
+            return ret
+
+    def set_system_message(self, system_message: str):
+        """Set the system message."""
+        self.system_message = system_message
+
+    def append_message(self, role: str, message: str):
+        """Append a new message."""
+        self.messages.append([role, message])
+
+    def update_last_message(self, message: str):
+        """Update the last output.
+
+        The last message is typically set to be None when constructing the prompt,
+        so we need to update it in-place after getting the response from a model.
+        """
+        self.messages[-1][1] = message
+
+    def copy(self):
+        return Conversation(
+            name=self.name,
+            system_template=self.system_template,
+            system_message=self.system_message,
+            roles=self.roles,
+            messages=[[x, y] for x, y in self.messages],
+            offset=self.offset,
+            sep_style=self.sep_style,
+            sep=self.sep,
+            sep2=self.sep2,
+            stop_str=self.stop_str,
+            stop_token_ids=self.stop_token_ids,
+        )
+
+    def dict(self):
+        return {
+            "template_name": self.name,
+            "system_message": self.system_message,
+            "roles": self.roles,
+            "messages": self.messages,
+            "offset": self.offset,
+        }
+
+
+# A global registry for all conversation templates
+conv_templates: Dict[str, Conversation] = {}
+
+
+def register_conv_template(template: Conversation, override: bool = False):
+    """Register a new conversation template."""
+    if not override:
+        assert (
+            template.name not in conv_templates
+        ), f"{template.name} has been registered."
+
+    conv_templates[template.name] = template
+
+
+def get_conv_template(name: str) -> Conversation:
+    """Get a conversation template."""
+    return conv_templates[name].copy()
+
+def get_conversation_template(model_path: str) -> Conversation:
+    """Get the default conversation template."""
+    if "aquila-v1" in model_path:
+        return get_conv_template("aquila-v1")
+    elif "aquila-chat" in model_path:
+        return get_conv_template("aquila-chat")
+    elif "aquila-legacy" in model_path:
+        return get_conv_template("aquila-legacy")
+    else:
+        return get_conv_template("aquila")
+
+# AquilaChat default template
+# source: https://github.com/FlagAI-Open/FlagAI/blob/master/examples/Aquila/Aquila-chat/cyg_conversation.py
+register_conv_template(
+    Conversation(
+        name="aquila-chat",
+        system_message="A chat between a curious human and an artificial intelligence assistant. "
+        "The assistant gives helpful, detailed, and polite answers to the human's questions.",
+        roles=("Human", "Assistant", "System"),
+        messages=(),
+        offset=0,
+        sep_style=SeparatorStyle.ADD_COLON_SINGLE,
+        sep="###",
+        sep2="",
+        stop_str=["###", "</s>", "[UNK]"],
+    )
+)
+
+register_conv_template(
+    Conversation(
+        name="aquila-legacy",
+        system_message="A chat between a curious human and an artificial intelligence assistant. "
+        "The assistant gives helpful, detailed, and polite answers to the human's questions.\n\n",
+        roles=("### Human: ", "### Assistant: ", "System"),
+        messages=(),
+        offset=0,
+        sep_style=SeparatorStyle.NO_COLON_TWO,
+        sep="\n",
+        sep2="</s>",
+        stop_str=["</s>", "[UNK]"],
+    )
+)
+
+register_conv_template(
+    Conversation(
+        name="aquila",
+        system_message="A chat between a curious human and an artificial intelligence assistant. "
+        "The assistant gives helpful, detailed, and polite answers to the human's questions.",
+        roles=("Human", "Assistant", "System"),
+        messages=(),
+        offset=0,
+        sep_style=SeparatorStyle.ADD_COLON_TWO,
+        sep="###",
+        sep2="</s>",
+        stop_str=["</s>", "[UNK]"],
+    )
+)
+
+register_conv_template(
+    Conversation(
+        name="aquila-v1",
+        roles=("<|startofpiece|>", "<|endofpiece|>", ""),
+        messages=(),
+        offset=0,
+        sep_style=SeparatorStyle.NO_COLON_TWO,
+        sep="",
+        sep2="</s>",
+        stop_str=["</s>", "<|endoftext|>"],
+    )
+)
+
+
+if __name__ == "__main__":
+    print("aquila template:")
+    conv = get_conv_template("aquila")
+    conv.append_message(conv.roles[0], "Hello!")
+    conv.append_message(conv.roles[1], "Hi!")
+    conv.append_message(conv.roles[0], "How are you?")
+    conv.append_message(conv.roles[1], None)
+    print(conv.get_prompt())
+
+    print("\n")
+
+    print("aquila-chat template:")
+    conv = get_conv_template("aquila-chat")
+    conv.append_message(conv.roles[0], "Hello!")
+    conv.append_message(conv.roles[1], "Hi!")
+    conv.append_message(conv.roles[0], "How are you?")
+    conv.append_message(conv.roles[1], None)
+    print(conv.get_prompt())
+
+    print("\n")
+
+    print("aquila-v1 template:")
+    conv = get_conv_template("aquila-v1")
+    conv.append_message(conv.roles[0], "Hello!")
+    conv.append_message(conv.roles[1], "Hi!")
+    conv.append_message(conv.roles[0], "How are you?")
+    conv.append_message(conv.roles[1], None)
+    print(conv.get_prompt())
+
+    print("\n")
+
+    print("aquila-legacy template:")
+    conv = get_conv_template("aquila-legacy")
+    conv.append_message(conv.roles[0], "Hello!")
+    conv.append_message(conv.roles[1], "Hi!")
+    conv.append_message(conv.roles[0], "How are you?")
+    conv.append_message(conv.roles[1], None)
+    print(conv.get_prompt())
+
+    print("\n")
+
+def set_random_seed(seed):
+    """Set random seed for reproducability."""
+    if seed is not None and seed > 0:
+        random.seed(seed)
+        np.random.seed(seed)
+        torch.manual_seed(seed)
+
+def covert_prompt_to_input_ids_with_history(text, history, tokenizer, max_token, convo_template="aquila-chat"):
+    # aquila-chat as default
+    conv = get_conv_template(convo_template)
+
+    conv.append_message(conv.roles[1], None)
+    conv.append_message(conv.roles[0], text)
+
+    example = tokenizer.encode_plus(f"{conv.get_prompt()} ", None, max_length=None)['input_ids']
+
+    if history is None or not isinstance(history, list):
+      history = []
+
+    while(len(history) > 0 and (len(example) < max_token)):
+        tmp = history.pop()
+        if tmp[0] == 'ASSISTANT':
+            conv.append_message(conv.roles[1], tmp[1])
+        else:
+            conv.append_message(conv.roles[0], tmp[1])
+        example = tokenizer.encode_plus(f"{conv.get_prompt()} ", None, max_length=None)['input_ids']
+
+    if len(example) >= max_token:
+        conv.messages.pop()
+    conv.messages = conv.messages[::-1]
+    print('model in:', conv.get_prompt())
+    example = tokenizer.encode_plus(f"{conv.get_prompt()} ", None, max_length=None)['input_ids']
+
+    return example
+
+def predict(model, text, tokenizer=None,
+            max_gen_len=200, top_p=0.95,
+            seed=1234, topk=100,
+            temperature=0.9, 
+            sft=True, convo_template = "",
+            device = "cuda",
+            model_name="AquilaChat2-7B",
+            history=None,
+            **kwargs):
+
+    vocab = tokenizer.get_vocab()
+
+    id2word = {v:k for k, v in vocab.items()}
+
+    
+    template_map = {"AquilaChat2-7B": "aquila-v1",
+                    "AquilaChat2-34B": "aquila-legacy",
+                    "AquilaChat2-7B-16K": "aquila",
+                    "AquilaChat2-34B-16K": "aquila"}
+    if not convo_template:
+        convo_template=template_map.get(model_name, "aquila-chat")
+
+    set_random_seed(seed)
+    if temperature == 0:
+        topk = 1
+        temperature = 1.0
+    if sft:
+        tokens = covert_prompt_to_input_ids_with_history(text, history=history, tokenizer=tokenizer, max_token=2048, convo_template=convo_template)
+        tokens = torch.tensor(tokens)[None,].to(device)
+    else :
+        tokens = tokenizer.encode_plus(text)["input_ids"]
+        print(tokenizer.decode(tokens))
+        tokens = torch.tensor(tokens)[None,].to(device)
+    input_length = len(tokens[0])
+    with torch.no_grad():
+
+        # instantiate logits processors
+        logits_processor = LogitsProcessorList(
+            [
+                MinLengthLogitsProcessor(1, eos_token_id=100007),
+            ]
+        )
+        # instantiate logits processors
+        logits_warper = LogitsProcessorList(
+            [
+                TopPLogitsWarper(top_p),
+                TopKLogitsWarper(topk),
+                TemperatureLogitsWarper(temperature),
+                
+            ]
+        )
+
+        stopping_criteria = StoppingCriteriaList([MaxLengthCriteria(max_length=input_length + max_gen_len)])
+        out = model.sample(
+                            tokens,
+                            logits_processor=logits_processor,
+                            logits_warper=logits_warper,
+                            stopping_criteria=stopping_criteria,
+                            return_dict_in_generate=True, 
+                            output_scores=True,
+                        )
+
+        
+        # print(out)
+        out_ids = out["sequences"][0][input_length:].cpu().numpy()
+
+        out_scores = out["scores"]
+
+        out_scores = torch.cat(out_scores, dim=0)
+        out_scores = torch.nn.functional.softmax(out_scores, dim=-1).cpu().numpy()
+
+        probs = []
+        for i in range(len(out_ids)):
+            probs.append(float(out_scores[i][out_ids[i]]))
+
+        # print(f"probs is {probs}")
+
+        convert_tokens = []
+        for t in out_ids:
+            if t == 100006:
+                convert_tokens.append("[CLS]")
+            else :
+                convert_tokens.append(id2word.get(t, "[unkonwn_token]"))
+
+        out_text = tokenizer.decode(out_ids.tolist())
+        
+
+        out = out_text
+
+    if "[UNK]" in out:
+        special_index = out.index("[UNK]")
+        out = out[:special_index]
+        token_length = len(tokenizer.encode_plus(out)["input_ids"])
+        convert_tokens = convert_tokens[:token_length]
+        probs = probs[:token_length]
+
+    if "</s>" in out:
+        special_index = out.index("</s>")
+        out = out[: special_index]
+        token_length = len(tokenizer.encode_plus(out)["input_ids"])
+        convert_tokens = convert_tokens[:token_length]
+        probs = probs[:token_length]
+
+    if len(out) > 0 and out[0] == " ":
+        out = out[1:]
+
+        convert_tokens = convert_tokens[1:]
+        probs = probs[1:]
+
+    if isinstance(history, list):
+        # Update history
+        history.insert(0, ('ASSISTANT', out))
+        history.insert(0, ('USER', text))
+
+    return out