292 lines
11 KiB
Python
292 lines
11 KiB
Python
import os
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import torch
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import torch.nn as nn
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import re
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import json
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import PyPDF2
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import docx2txt
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import pytesseract
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from PIL import Image
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from collections import defaultdict
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from transformers import (
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AutoTokenizer,
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AutoModelForCausalLM,
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TrainingArguments,
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Trainer,
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DataCollatorForLanguageModeling
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)
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from datasets import Dataset, Features, Value, Sequence
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from huggingface_hub import login
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# Konfiguracja
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os.environ["TOKENIZERS_PARALLELISM"] = "false"
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login(token="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")
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class LegalAITrainer:
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def __init__(self):
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self.device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
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class SourceMapper:
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def __init__(self):
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self.source_to_idx = defaultdict(lambda: len(self.source_to_idx))
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self.idx_to_source = {}
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def add_source(self, source):
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if source and source not in self.source_to_idx:
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idx = self.source_to_idx[source]
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self.idx_to_source[idx] = source
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def get_idx(self, source):
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return self.source_to_idx[source] if source else -1
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def get_source(self, idx):
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return self.idx_to_source.get(idx, "Unknown")
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class LegalModel(nn.Module):
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def __init__(self, model_name, config):
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super().__init__()
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self.base_model = AutoModelForCausalLM.from_pretrained(model_name, config=config)
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self.source_embedding = nn.Embedding(100000, config.hidden_size, padding_idx=-1)
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self.confidence_layer = nn.Linear(config.hidden_size, 1)
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# Freeze base model
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for param in self.base_model.parameters():
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param.requires_grad = False
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# Trainable components
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for layer in [self.source_embedding, self.confidence_layer]:
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for param in layer.parameters():
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param.requires_grad = True
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def forward(self, input_ids=None, attention_mask=None, labels=None, source_idx=None):
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if source_idx is not None:
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source_idx = torch.clamp(source_idx, 0, self.source_embedding.num_embeddings-1)
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source_embeds = self.source_embedding(source_idx).unsqueeze(1)
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inputs_embeds = self.base_model.get_input_embeddings()(input_ids) + source_embeds
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outputs = self.base_model(
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inputs_embeds=inputs_embeds,
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attention_mask=attention_mask,
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labels=labels
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)
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else:
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outputs = self.base_model(
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input_ids=input_ids,
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attention_mask=attention_mask,
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labels=labels
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)
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confidence = torch.sigmoid(self.confidence_layer(outputs.hidden_states[-1].mean(dim=1)))
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return {
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"loss": outputs.loss,
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"logits": outputs.logits,
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"confidence": confidence,
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"hidden_states": outputs.hidden_states
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}
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def load_file_catalog(self, catalog_path):
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try:
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with open(catalog_path, 'r', encoding='utf-8') as f:
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return json.load(f)
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except Exception as e:
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print(f"Błąd ładowania katalogu: {str(e)}")
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return {}
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def extract_text(self, file_path):
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ext = os.path.splitext(file_path)[1].lower()
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try:
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if ext in ['.txt', '.md']:
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with open(file_path, 'r', encoding='utf-8') as f:
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return f.read()
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elif ext == '.pdf':
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text = ""
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with open(file_path, 'rb') as f:
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reader = PyPDF2.PdfReader(f)
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for page in reader.pages:
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text += page.extract_text() or ""
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return text
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elif ext in ['.doc', '.docx']:
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return docx2txt.process(file_path)
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elif ext in ['.jpg', '.jpeg', '.png']:
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return pytesseract.image_to_string(Image.open(file_path))
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else:
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return ""
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except Exception as e:
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print(f"Błąd przetwarzania {file_path}: {str(e)}")
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return ""
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def prepare_data(self, data_dir, catalog_path):
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catalog = self.load_file_catalog(catalog_path)
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data = []
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source_mapper = self.SourceMapper()
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for root, _, files in os.walk(data_dir):
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for file in files:
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file_path = os.path.join(root, file)
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text = self.extract_text(file_path)
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if not text:
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continue
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doc_type = catalog.get(os.path.splitext(file)[0].lower(), "Opracowanie własne")
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if doc_type != "Opracowanie własne":
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articles = re.split(r'(?i)(Art\.\s*\d+[a-z]*)', text)
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for i in range(1, len(articles), 2):
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art_num = articles[i].strip()
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content = articles[i+1].strip()
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if len(content) < 100:
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continue
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source = f"{doc_type}, {art_num}"
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source_mapper.add_source(source)
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data.append({
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"text": f"[LEGAL] {art_num} {content}",
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"source_idx": source_mapper.get_idx(source),
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"is_legal": 1
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})
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else:
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chunks = [f"[GENERAL] {text[i:i+512]}" for i in range(0, len(text), 512)]
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for chunk in chunks:
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data.append({
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"text": chunk,
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"source_idx": -1,
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"is_legal": 0
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})
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features = Features({
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"text": Value("string"),
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"source_idx": Sequence(Value("int32")),
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"is_legal": Value("int32")
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})
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return Dataset.from_dict({
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"text": [d["text"] for d in data],
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"source_idx": [[d["source_idx"]] for d in data], # Zwracamy jako listę list
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"is_legal": [d["is_legal"] for d in data]
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}, features=features), source_mapper
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def train(self, model_name="crumb/nano-mistral", data_dir="data", catalog_path="catalog.json"):
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dataset, source_mapper = self.prepare_data(data_dir, catalog_path)
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tokenizer = AutoTokenizer.from_pretrained(model_name)
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tokenizer.pad_token = tokenizer.eos_token
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def tokenize_fn(examples):
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tokenized = tokenizer(
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examples["text"],
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padding="max_length",
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truncation=True,
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max_length=512,
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return_tensors="pt"
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)
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# Konwersja tensorów do list i odpowiednich typów
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return {
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"input_ids": [ids.tolist() for ids in tokenized["input_ids"]],
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"attention_mask": [mask.tolist() for mask in tokenized["attention_mask"]],
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"labels": [labels.tolist() for labels in tokenized["input_ids"]],
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"source_idx": [[idx] for idx in examples["source_idx"]] # Sekwencja długości 1
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}
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tokenized_dataset = dataset.map(tokenize_fn, batched=True, batch_size=16)
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config = AutoModelForCausalLM.from_pretrained(model_name).config
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model = self.LegalModel(model_name, config).to(self.device)
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training_args = TrainingArguments(
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output_dir="./legal_ai_model",
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num_train_epochs=3,
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per_device_train_batch_size=2,
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gradient_accumulation_steps=4,
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learning_rate=2e-5,
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fp16=torch.cuda.is_available(),
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logging_steps=50,
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save_strategy="steps",
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save_steps=500,
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report_to="none",
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remove_unused_columns=False
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)
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class LegalTrainer(Trainer):
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def compute_loss(self, model, inputs, return_outputs=False):
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outputs = model(**inputs)
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loss = outputs["loss"]
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target_conf = (inputs["source_idx"] != -1).float()
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conf_loss = nn.BCELoss()(outputs["confidence"].squeeze(), target_conf)
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total_loss = loss + 0.7 * conf_loss
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return (total_loss, outputs) if return_outputs else total_loss
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trainer = LegalTrainer(
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model=model,
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args=training_args,
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train_dataset=tokenized_dataset,
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data_collator=DataCollatorForLanguageModeling(tokenizer=tokenizer, mlm=False)
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)
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print("Rozpoczęcie treningu...")
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trainer.train()
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model.save_pretrained("./trained_legal_ai")
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tokenizer.save_pretrained("./trained_legal_ai")
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with open("./trained_legal_ai/source_mapper.json", "w") as f:
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json.dump(source_mapper.idx_to_source, f)
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print("Trening zakończony!")
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def generate_response(self, prompt, confidence_threshold=0.65):
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model = self.LegalModel.from_pretrained(
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"./trained_legal_ai",
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config=AutoModelForCausalLM.from_pretrained("crumb/nano-mistral").config
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).to(self.device)
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tokenizer = AutoTokenizer.from_pretrained("./trained_legal_ai")
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with open("./trained_legal_ai/source_mapper.json", "r") as f:
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source_mapper = json.load(f)
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inputs = tokenizer(
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f"[PROMPT] {prompt} [RESPONSE]",
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return_tensors="pt",
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max_length=512,
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truncation=True
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).to(self.device)
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with torch.no_grad():
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outputs = model.generate(
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input_ids=inputs.input_ids,
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attention_mask=inputs.attention_mask,
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max_length=512,
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do_sample=True,
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temperature=0.7,
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top_k=50,
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pad_token_id=tokenizer.eos_token_id,
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output_scores=True,
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return_dict_in_generate=True
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)
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full_text = tokenizer.decode(outputs.sequences[0], skip_special_tokens=True)
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confidence = torch.sigmoid(outputs.scores[-1][:, tokenizer.eos_token_id]).item()
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citations = list(set(re.findall(r"Art\.\s*\d+[a-z]*", full_text)))
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verified = [c for c in citations if any(c in s for s in source_mapper.values())]
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if confidence < confidence_threshold or not verified:
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return "Nie mogę udzielić jednoznacznej odpowiedzi na podstawie dostępnych danych."
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else:
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return f"{full_text}\n\nPotwierdzone źródła: {', '.join(verified)}"
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if __name__ == "__main__":
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legal_ai = LegalAITrainer()
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# Trening
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legal_ai.train(
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model_name="crumb/nano-mistral",
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data_dir="./legal_docs",
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catalog_path="./catalog.json"
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)
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# Test
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test_prompt = "Jakie są obowiązki pracodawcy w zakresie BHP?"
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print(legal_ai.generate_response(test_prompt)) |