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import streamlit as st
import numpy as np
import pandas as pd
# modeling
import torch
from torch.utils.data import Dataset, DataLoader
import pytorch_lightning as pl
from pytorch_lightning import Trainer, seed_everything
from pytorch_lightning.callbacks import ModelCheckpoint
from pytorch_lightning.callbacks.early_stopping import EarlyStopping
from transformers import (
T5ForConditionalGeneration,
T5TokenizerFast as T5Tokenizer,
)
from transformers.optimization import Adafactor
# aesthetics
from IPython.display import Markdown, display, clear_output
import re
import warnings
warnings.filterwarnings(
"ignore", ".*Trying to infer the `batch_size` from an ambiguous collection.*"
)
seed_everything(25429)
# scoring
import spacy
from nltk.translate.bleu_score import sentence_bleu, SmoothingFunction
device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
print(device)
# loading the model
hug = 't5-small'
t5tokenizer = T5Tokenizer.from_pretrained(hug)
t5model = T5ForConditionalGeneration.from_pretrained(hug, return_dict=True)
# defining tokens
SEP_TOKEN = '<sep>'
MASK_TOKEN = '[MASK]'
MASKING_CHANCE = 0.1
class DataEncodings(Dataset):
'''
tokenizes, pads, and adds special tokens
'''
def __init__(
self,
data: pd.DataFrame,
tokenizer,
source_max_token_len: int,
target_max_token_len: int
):
self.tokenizer = t5tokenizer
self.data = data
self.source_max_token_len = source_max_token_len
self.target_max_token_len = target_max_token_len
def __len__(self):
return len(self.data)
def __getitem__(self, index:int):
data_row = self.data.iloc[index]
# adds a random mask for answer-agnostic qg
if np.random.rand() > MASKING_CHANCE:
answer = data_row['answer']
else:
answer = MASK_TOKEN
source_encoding = t5tokenizer(
f"{answer} {SEP_TOKEN} {data_row['context']}",
max_length= self.source_max_token_len,
padding='max_length',
truncation= True,
return_attention_mask=True,
return_tensors='pt'
)
target_encoding = t5tokenizer(
f"{data_row['answer']} {SEP_TOKEN} {data_row['question']}",
max_length=self.target_max_token_len,
padding='max_length',
truncation = True,
return_attention_mask=True,
return_tensors='pt'
)
labels = target_encoding['input_ids']
labels[labels == 0] = -100 # masked
encodings = dict(
answer = data_row['answer'],
context = data_row['context'],
question = data_row['question'],
input_ids = source_encoding['input_ids'].flatten(),
attention_mask = source_encoding['attention_mask'].flatten(),
labels=labels.flatten()
)
return encodings
class DataModule(pl.LightningDataModule):
def __init__(
self,
train: pd.DataFrame,
val: pd.DataFrame,
tokenizer,
batch_size,
source_max_token_len: int,
target_max_token_len: int
):
super().__init__()
self.batch_size = batch_size
self.train = train
self.val = val
self.tokenizer = t5tokenizer
self.source_max_token_len = source_max_token_len
self.target_max_token_len = target_max_token_len
def setup(self):
self.train_dataset = DataEncodings(self.train, self.tokenizer, self.source_max_token_len, self.target_max_token_len)
self.val_dataset = DataEncodings(self.val, self.tokenizer, self.source_max_token_len, self.target_max_token_len)
def train_dataloader(self):
return DataLoader(self.train_dataset, batch_size=batch_size, shuffle=True, num_workers=0)
def val_dataloader(self):
return DataLoader(self.val_dataset, batch_size=batch_size, num_workers=0)
# hyperparameters
num_epochs = 16
batch_size = 32
learning_rate = 0.001
# model
class T5Model(pl.LightningModule):
def __init__(self):
super().__init__()
self.model = t5model
self.model.resize_token_embeddings(len(t5tokenizer)) # resizing after adding new tokens to the tokenizer
# feed forward pass
def forward(self, input_ids, attention_mask, labels=None):
output = self.model(input_ids=input_ids, attention_mask=attention_mask, labels=labels)
return output.loss, output.logits
# train model and compute loss
def training_step(self, batch, batch_idx):
input_ids = batch['input_ids']
attention_mask = batch['attention_mask']
labels = batch['labels']
loss, output = self(input_ids, attention_mask, labels)
self.log('train_loss', loss, prog_bar=True, logger=True, batch_size=batch_size)
return loss
# gets model predictions, returns loss
def validation_step(self, batch, batch_idx):
input_ids = batch['input_ids']
attention_mask = batch['attention_mask']
labels = batch['labels']
loss, output = self(input_ids, attention_mask, labels)
self.log('val_loss', loss, prog_bar=True, logger=True, batch_size=batch_size)
return {'val loss': loss}
# def validation_epoch_end(self, outputs):
# # outputs = list of dictionaries to print loss
# avg_loss = torch.stack([x['val_loss'] for x in outputs]).mean()
# tensorboard_logs = {'avg_val_loss': avg_loss}
# return {'val_loss': avg_loss, 'log': tensorboard_logs}
def configure_optimizers(self):
return Adafactor(model.parameters(), scale_parameter=False, relative_step=False, lr=learning_rate)
def generate(model: T5Model, answer:str, context:str, beams, length, temper) -> str:
source_encoding = t5tokenizer(
f"{answer} {SEP_TOKEN} {context}",
max_length=512,
padding='max_length',
truncation=True,
return_attention_mask=True,
add_special_tokens=True,
return_tensors='pt'
)
generated_ids=model.model.generate(
input_ids=source_encoding['input_ids'],
attention_mask=source_encoding['attention_mask'],
num_beams=beams,
max_length=length,
repetition_penalty=2.5,
length_penalty=0.8,
temperature=temper,
early_stopping=True,
use_cache=True
)
preds = {
t5tokenizer.decode(generated_id, skip_special_tokens=False, clean_up_tokenization_spaces=True)
for generated_id in generated_ids
}
return ''.join(preds)
def show_result(generated:str, answer:str, context:str, original_question:str=''):
regex = r"(?<=>)(.*?)(?=<)"
matches = re.findall(regex, generated)
matches[1] = matches[1][5:]
final = {cat: match.strip() for cat, match in zip(['Answer', 'Question'], matches)}
st.title('Context')
st.write(context)
st.title('Answer')
st.write(answer)
st.title('Generated')
st.write(final)
# if original_question:
# printBold('Original Question')
# print(original_question)
# gen = nlp(matches[1])
# ori = nlp(original_question)
# bleu_score = sentence_bleu(matches[1], original_question, smoothing_function=SmoothingFunction().method5)
# cs_score = ori.similarity(gen)
# printBold('Scores')
# print(f"BLEU: {bleu_score}")
# print(f'Cosine Similarity: {cs_score}')
# return bleu_score, cs_score
# streamlit app
st.title('Question Generation From Text')
with st.form('my_form'):
context = st.text_input('Enter a context passage for question generation:', 'The capital of France is Paris.')
answer = st.text_input('Give a correct answer, or [MASK] for unsupervised generation:', 'Paris')
# question = st.text_input('Question', 'What is the capital of France?')
# original_question = st.text_input('Original Question', 'What is the capital of France?')
beams = st.sidebar.slider('Beams', min_value=1, max_value=20)
length = st.sidebar.slider('Maximum length of generated question', min_value=50, max_value=200)
temper = st.sidebar.slider("Temperature", value = 1.0, min_value = 0.0, max_value=1.0, step=0.05)
submitted = st.form_submit_button('Generate')
with st.spinner('Loading Model...'):
model = T5Model
best_model_dir = 't5-chkpt-v2.ckpt'
best_model = model.load_from_checkpoint(best_model_dir)
# best_model = model.load_from_checkpoint(callback.best_model_path)
best_model.freeze()
with st.spinner('Generating...'):
if submitted:
generated = generate(best_model, answer, context, beams, length, temper)
show_result(generated, answer, context)
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