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kraken_model/configuration_kraken.py

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+from transformers import PretrainedConfig
+
+class KrakenConfig(PretrainedConfig):
+    model_type = "kraken"
+    
+    def __init__(self, config_dict=None, **kwargs):
+        super().__init__(**kwargs)
+        self.config_dict = config_dict or {}

kraken_model/modeling_kraken.py

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+import torch
+from transformers import PreTrainedModel, AutoTokenizer, AutoModelForCausalLM, AutoModelForSequenceClassification, TextClassificationPipeline
+from configuration_kraken import KrakenConfig
+import tokenizer_template_switch
+
+class KrakenForCausalLM(PreTrainedModel):
+    config_class = KrakenConfig
+
+    def __init__(self, config):
+        super().__init__(config)
+        self.tokenizers = {key: AutoTokenizer.from_pretrained(name, device_map="auto") for key, name in config.config_dict['tokenizers'].items()}
+        self.models = self.load_expert_models(config.config_dict['models'], config.config_dict['quantization'])
+        self.router_model = AutoModelForSequenceClassification.from_pretrained(config.config_dict['router'], trust_remote_code=True,device_map="auto")
+        self.tokenizer = AutoTokenizer.from_pretrained(config.config_dict['router'], trust_remote_code=True,device_map="auto")
+        self.router = TextClassificationPipeline(model=self.router_model, tokenizer=self.tokenizer)
+        self.models_indices = config.config_dict['class_indices']
+
+    def load_expert_models(self, models_dict, quantization_dict):
+        models = {}
+        for key, name in models_dict.items():
+            quantization = quantization_dict.get(key)
+            if quantization == "8bit":
+                models[key] = AutoModelForCausalLM.from_pretrained(name, trust_remote_code=True, device_map="auto", load_in_8bit=True, torch_dtype="auto")
+            elif quantization == "4bit":
+                models[key] = AutoModelForCausalLM.from_pretrained(name, trust_remote_code=True, device_map="auto", load_in_4bit=True, torch_dtype="auto")
+            elif quantization == "awq":
+                models[key] = self.load_awq_model(name)
+            else:
+                models[key] = AutoModelForCausalLM.from_pretrained(name, trust_remote_code=True, device_map="auto", torch_dtype="auto")
+        return models
+
+    def load_awq_model(self, name):
+        return AutoModelForCausalLM.from_pretrained(name, trust_remote_code=True, device_map="auto")
+
+    def tokenize_inputs(self, text, model_key):
+        return self.tokenizers[model_key](text, return_tensors="pt")
+
+    def determine_model(self, text):
+        prediction = self.router(text)[0]["label"]
+        model_decision_index = self.models_indices[prediction]
+        model_keys = ['expert1', 'expert2', 'expert3', 'expert4','expert5']
+        return model_keys[model_decision_index]
+    
+    def expert_tokenizer(self, text):
+        model_key = self.determine_model(text)
+        return self.tokenizers[model_key]
+
+
+    def generate(self, input_ids, **generate_kwargs):
+        # Tokenize the input_ids
+        text = self.tokenizer.batch_decode(input_ids, skip_special_tokens=False)[0]
+
+        msgs = tokenizer_template_switch.recover_chat_messages(text, self.tokenizer)
+        if msgs and msgs[0]['role'] == 'system' and msgs[0]['content']=='<|im_start|>system':
+            # Delete the first element
+            msgs.pop(0)  
+        # Check if the last element has the role 'assistant'
+        if msgs and msgs[-1]['role'] == 'assistant':
+            # Delete the last element
+            msgs.pop()  
+
+        # Determine the model key using the existing routing logic
+        model_key = self.determine_model(text)
+        # Show the routing result
+        print(f"Choosing {model_key} ..")
+        # Retrieve the model from the dictionary
+        model = self.models[model_key]
+
+        mod_txt = self.tokenizers[model_key].apply_chat_template(msgs, tokenize=False, add_generation_prompt=True)
+        current_device = input_ids.device if isinstance(input_ids, torch.Tensor) else 'cpu'
+        
+        # Tokenize accordingly to the best model
+
+        tok = self.tokenizers[model_key](mod_txt, return_tensors="pt")
+        tok_input_ids = tok.input_ids.to(current_device)  
+        tok_attention_mask = tok.attention_mask.to(current_device)
+
+        # Generate text using the retrieved model
+        return model.generate(tok_input_ids, attention_mask=tok_attention_mask, **generate_kwargs)
+    
+
+      

kraken_model/tokenizer_template_switch.py

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+import re
+from transformers import AutoTokenizer
+
+def extract_separators(template):
+    """
+    Extracts separators used in the tokenization template.
+    """
+    # Adjust the regex to correctly match the specific pattern between '{{' and '+ message["content"] +'
+    pattern = r"\{\{\s*([^{}]+?)\s*\+ message\['content'\]"
+    matches = re.findall(pattern, template)
+    # Clean up any extra spaces and return the matches
+    separators = [match.strip() for match in matches]
+
+    if any("message['role']" in element for element in separators):
+        roles = ["system", "user", "assistant"]
+        separators_ = []
+        for role in roles:
+            separators_.append(separators[0].replace(" + message['role'] + ", role).replace("'",""))
+        return separators_
+
+    return separators
+
+def detect_eos_token(jinja_template, tokenizer):
+    if "<|im_end|>" in jinja_template:
+        return "<|im_end|>"
+    if "</s>" in jinja_template:
+        return "</s>"
+    if "eos_token" in jinja_template:
+        return tokenizer.eos_token    
+    else:
+        return "<|endoftext|>"
+
+def recover_messages(formatted_message, separators, eos_token):
+    """
+    Recovers the original messages from the formatted message string.
+    """
+    # Split the formatted message using the end-of-string token
+    split_messages = formatted_message.split(eos_token)
+    
+    # Remove the last empty string if it exists due to a trailing separator
+    if split_messages and split_messages[-1].strip() == '':
+        split_messages.pop()
+
+    # Prepare the list to hold the recovered messages
+    recovered_messages = []
+
+    # Define roles after the first message, alternating between "user" and "assistant"
+    alternate_roles = ["user", "assistant"]
+    
+    # Iterate over the split messages
+    for index, message_content in enumerate(split_messages):
+        # Determine the role, starting with "system" for the first message
+        # then alternating between "user" and "assistant" for subsequent messages
+        if index == 0:
+            role = "system"
+        else:
+            role = alternate_roles[(index - 1) % 2]
+
+        # Clean the message content by removing leading/trailing whitespace and separators
+        clean_content = message_content.strip()
+        for separator in separators:
+            clean_content = clean_content.replace(separator.strip("'"), '', 1).strip()
+
+        # Append the cleaned message with its role to the list
+        recovered_messages.append({"role": role, "content": clean_content})
+
+    return recovered_messages
+
+def recover_chat_messages(tokenized_chat, tokenizer):
+    """
+    Given a tokenized_chat string and a tokenizer, returns the list of message dictionaries.
+    """
+    jinja_template = tokenizer.chat_template
+    separators = extract_separators(jinja_template)
+    eos_token = eos_token = detect_eos_token(jinja_template, tokenizer)
+    recovered_messages = recover_messages(tokenized_chat, separators, eos_token)
+    return recovered_messages
+
+# Example usage
+if __name__ == "__main__":
+    checkpoint = "Qwen/Qwen1.5-0.5B"
+    tokenizer = AutoTokenizer.from_pretrained(checkpoint)
+    
+    messages = [
+        {
+            "role": "system",
+            "content": "You are a friendly chatbot who always responds in the style of a pirate",
+        },
+        {"role": "user", "content": "How many helicopters can a human eat in one sitting?"},
+    ]
+    tokenized_chat = tokenizer.apply_chat_template(messages, tokenize=False)
+    print(tokenized_chat)
+    
+    recovered_messages = recover_chat_messages(tokenized_chat, tokenizer)
+    print(recovered_messages)