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from safetensors.torch import load_model
from transformers import RobertaTokenizer, AutoTokenizer, AutoModelForSequenceClassification, Trainer, TrainingArguments
from transformers import GPT2TokenizerFast, GPT2ForSequenceClassification, Trainer, TrainingArguments, DataCollatorWithPadding
from transformers import DistilBertTokenizerFast, DistilBertForSequenceClassification, Trainer, TrainingArguments, DataCollatorWithPadding




def get_roberta():

    model = AutoModelForSequenceClassification.from_pretrained('cross-encoder/nli-roberta-base')
    load_model(model, "roberta.safetensors")

    tokenizer = AutoTokenizer.from_pretrained('cross-encoder/nli-roberta-base')

    return tokenizer, model

def get_gpt():
    
    model = GPT2ForSequenceClassification.from_pretrained('gpt2', num_labels=3)
    model.config.pad_token_id = model.config.eos_token_id
    load_model(model, "gpt.safetensors")

    tokenizer = GPT2TokenizerFast.from_pretrained('gpt2')
    tokenizer.pad_token = tokenizer.eos_token

    return tokenizer, model

def get_distilbert():

    model = DistilBertForSequenceClassification.from_pretrained('distilbert-base-uncased', num_labels=3)
    load_model(model, "distilbert.safetensors")

    tokenizer = DistilBertTokenizerFast.from_pretrained('distilbert-base-uncased')

    return tokenizer, model