app_1.py

import streamlit as st
import torch
from transformers import AutoConfig, AutoTokenizer, AutoModel
from huggingface_hub import login
import re
import copy
from modeling_st2 import ST2ModelV2, SignalDetector
from huggingface_hub import hf_hub_download
from safetensors.torch import load_file

hf_token = st.secrets["HUGGINGFACE_TOKEN"]
login(token=hf_token)


# Load model & tokenizer once (cached for efficiency)
@st.cache_resource
def load_model():
    
    config = AutoConfig.from_pretrained("roberta-large")

    tokenizer = AutoTokenizer.from_pretrained("roberta-large", use_fast=True, add_prefix_space=True)
    
    class Args:
        def __init__(self):
            
            self.dropout = 0.1
            self.signal_classification = True
            self.pretrained_signal_detector = False

    args = Args()

    model = ST2ModelV2(args)


    repo_id = "anamargarida/SpanExtractionWithSignalCls_2"  
    filename = "model.safetensors"  

    # Download the model file
    model_path = hf_hub_download(repo_id=repo_id, filename=filename)

    # Load the model weights
    state_dict = load_file(model_path)

    model.load_state_dict(state_dict)
    
    return tokenizer, model

# Load the model and tokenizer
tokenizer, model = load_model()

model.eval()  # Set model to evaluation mode
def extract_arguments(text, tokenizer, model, beam_search=True):
     
    class Args:
        def __init__(self):
            self.signal_classification = True
            self.pretrained_signal_detector = False
        
    args = Args()
    inputs = tokenizer(text, return_offsets_mapping=True, return_tensors="pt")
    
    # Get tokenized words (for reconstruction later)
    word_ids = inputs.word_ids()
    
    with torch.no_grad():
        outputs = model(**inputs)


    # Extract logits
    start_cause_logits = outputs["start_arg0_logits"][0]
    end_cause_logits = outputs["end_arg0_logits"][0]
    start_effect_logits = outputs["start_arg1_logits"][0]
    end_effect_logits = outputs["end_arg1_logits"][0]
    start_signal_logits = outputs["start_sig_logits"][0]
    end_signal_logits = outputs["end_sig_logits"][0]


    # Set the first and last token logits to a very low value to ignore them
    start_cause_logits[0] = -1e-4
    end_cause_logits[0] = -1e-4
    start_effect_logits[0] = -1e-4
    end_effect_logits[0] = -1e-4
    start_cause_logits[len(inputs["input_ids"][0]) - 1] = -1e-4
    end_cause_logits[len(inputs["input_ids"][0]) - 1] = -1e-4
    start_effect_logits[len(inputs["input_ids"][0]) - 1] = -1e-4
    end_effect_logits[len(inputs["input_ids"][0]) - 1] = -1e-4

    
    # Beam Search for position selection
    if beam_search:
        indices1, indices2, _, _, _ = model.beam_search_position_selector(
            start_cause_logits=start_cause_logits,
            end_cause_logits=end_cause_logits,
            start_effect_logits=start_effect_logits,
            end_effect_logits=end_effect_logits,
            topk=5
        )
        start_cause1, end_cause1, start_effect1, end_effect1 = indices1
        start_cause2, end_cause2, start_effect2, end_effect2 = indices2
    else:
        start_cause1 = start_cause_logits.argmax().item()
        end_cause1 = end_cause_logits.argmax().item()
        start_effect1 = start_effect_logits.argmax().item()
        end_effect1 = end_effect_logits.argmax().item()

        start_cause2, end_cause2, start_effect2, end_effect2 = None, None, None, None

    
    has_signal = 1
    if args.signal_classification:
        if not args.pretrained_signal_detector:
            has_signal = outputs["signal_classification_logits"].argmax().item()
        else:
            has_signal = signal_detector.predict(text=batch["text"])

    if has_signal:
        start_signal_logits[0] = -1e-4
        end_signal_logits[0] = -1e-4
    
        start_signal_logits[len(inputs["input_ids"][0]) - 1] = -1e-4
        end_signal_logits[len(inputs["input_ids"][0]) - 1] = -1e-4
       
        start_signal = start_signal_logits.argmax().item()
        end_signal_logits[:start_signal] = -1e4
        end_signal_logits[start_signal + 5:] = -1e4
        end_signal = end_signal_logits.argmax().item()

    if not has_signal:
        start_signal, end_signal = None, None
        
    
    tokens = tokenizer.convert_ids_to_tokens(inputs["input_ids"][0])
    token_ids = inputs["input_ids"][0]
    offset_mapping = inputs["offset_mapping"][0].tolist()
    
    for i, (token, word_id) in enumerate(zip(tokens, word_ids)):
        st.write(f"Token {i}: {token}, Word ID: {word_id}")

    st.write("Token & offset:")
    for i, (token, offset) in enumerate(zip(tokens, offset_mapping)):
        st.write(f"Token {i}: {token}, Offset: {offset}")
    

    st.write("Token Positions, IDs, and Corresponding Tokens:")
    for position, (token_id, token) in enumerate(zip(token_ids, tokens)):
        st.write(f"Position: {position}, ID: {token_id}, Token: {token}")

    st.write(f"Start Cause 1: {start_cause1}, End Cause: {end_cause1}")
    st.write(f"Start Effect 1: {start_effect1}, End Cause: {end_effect1}")
    st.write(f"Start Signal: {start_signal}, End Signal: {end_signal}")

    def extract_span(start, end):
        return tokenizer.convert_tokens_to_string(tokens[start:end+1]) if start is not None and end is not None else ""

    cause1 = extract_span(start_cause1, end_cause1)
    cause2 = extract_span(start_cause2, end_cause2)
    effect1 = extract_span(start_effect1, end_effect1)
    effect2 = extract_span(start_effect2, end_effect2)
    if has_signal:
        signal = extract_span(start_signal, end_signal)
    if not has_signal:
        signal = 'NA'
    list1 = [start_cause1, end_cause1, start_effect1, end_effect1, start_signal, end_signal]
    list2 = [start_cause2, end_cause2, start_effect2, end_effect2, start_signal, end_signal]
    #return cause1, cause2, effect1, effect2, signal, list1, list2
    return start_cause1, end_cause1, start_cause2, end_cause2, start_effect1, end_effect1, start_effect2, end_effect2, start_signal, end_signal


   
def mark_text_by_position(original_text, start_idx, end_idx, color):
    """Marks text in the original string based on character positions."""
    if start_idx is not None and end_idx is not None and start_idx <= end_idx:
        return (
            original_text[:start_idx]
            + f"<mark style='background-color:{color}; padding:2px; border-radius:4px;'>"
            + original_text[start_idx:end_idx]
            + "</mark>"
            + original_text[end_idx:]
        )
    return original_text  # Return unchanged if indices are invalidt  # Return unchanged text if no span is found

def mark_text_by_tokens(tokenizer, tokens, start_idx, end_idx, color):
    """Highlights a span in tokenized text using HTML."""
    highlighted_tokens = copy.deepcopy(tokens)  # Avoid modifying original tokens
    if start_idx is not None and end_idx is not None and start_idx <= end_idx:
        highlighted_tokens[start_idx] = f"<span style='background-color:{color}; padding:2px; border-radius:4px;'>{highlighted_tokens[start_idx]}"
        highlighted_tokens[end_idx] = f"{highlighted_tokens[end_idx]}</span>"
    return tokenizer.convert_tokens_to_string(highlighted_tokens)

def mark_text_by_word_ids(original_text, token_ids, start_word_id, end_word_id, color):
    """Marks words in the original text based on word IDs from tokenized input."""
    words = original_text.split()  # Split text into words
    if start_word_id is not None and end_word_id is not None and start_word_id <= end_word_id:
        words[start_word_id] = f"<mark style='background-color:{color}; padding:2px; border-radius:4px;'>{words[start_word_id]}"
        words[end_word_id] = f"{words[end_word_id]}</mark>"
    
    return " ".join(words)




st.title("Causal Relation Extraction")
input_text = st.text_area("Enter your text here:", height=300)
beam_search = st.radio("Enable Beam Search?", ('No', 'Yes')) == 'Yes'


if st.button("Extract"):
    if input_text:
        start_cause1, end_cause1, start_cause2, end_cause2, start_effect1, end_effect1, start_effect2, end_effect2, start_signal, end_signal = extract_arguments(input_text, tokenizer, model, beam_search=beam_search)

        cause_text1 = mark_text_by_position(input_text, start_cause1, end_cause1, "#FFD700")  # Gold for cause
        effect_text1 = mark_text_by_position(input_text, start_effect1, end_effect1, "#90EE90")  # Light green for effect
        signal_text = mark_text_by_position(input_text, start_signal, end_signal, "#FF6347")  # Tomato red for signal

        # Display first relation
        st.markdown(f"<strong>Relation 1:</strong>", unsafe_allow_html=True)
        st.markdown(f"**Cause:** {cause_text1}", unsafe_allow_html=True)
        st.markdown(f"**Effect:** {effect_text1}", unsafe_allow_html=True)
        st.markdown(f"**Signal:** {signal_text}", unsafe_allow_html=True)

        # Display second relation if beam search is enabled
        if beam_search:
            cause_text2 = mark_text_by_position(input_text, start_cause2, end_cause2, "#FFD700")
            effect_text2 = mark_text_by_position(input_text, start_effect2, end_effect2, "#90EE90")

            st.markdown(f"<strong>Relation 2:</strong>", unsafe_allow_html=True)
            st.markdown(f"**Cause:** {cause_text2}", unsafe_allow_html=True)
            st.markdown(f"**Effect:** {effect_text2}", unsafe_allow_html=True)
            st.markdown(f"**Signal:** {signal_text}", unsafe_allow_html=True)

    else:
        st.warning("Please enter some text before extracting.")


        

    
if st.button("Extract1"):
    if input_text:
        start_cause_id, end_cause_id, start_effect_id, end_effect_id, start_signal_id, end_signal_id = extract_arguments(input_text, tokenizer, model, beam_search=beam_search)

        cause_text = mark_text_by_word_ids(input_text, inputs["input_ids"][0], start_cause_id, end_cause_id, "#FFD700")  # Gold for cause
        effect_text = mark_text_by_word_ids(input_text, inputs["input_ids"][0], start_effect_id, end_effect_id, "#90EE90")  # Light green for effect
        signal_text = mark_text_by_word_ids(input_text, inputs["input_ids"][0], start_signal_id, end_signal_id, "#FF6347")  # Tomato red for signal

        st.markdown(f"**Cause:**<br>{cause_text}", unsafe_allow_html=True)
        st.markdown(f"**Effect:**<br>{effect_text}", unsafe_allow_html=True)
        st.markdown(f"**Signal:**<br>{signal_text}", unsafe_allow_html=True)
    else:
        st.warning("Please enter some text before extracting.")




if st.button("Extract1"):
    if input_text:
        start_cause1, end_cause1, start_cause2, end_cause2, start_effect1, end_effect1, start_effect2, end_effect2, start_signal, end_signal = extract_arguments(input_text, tokenizer, model, beam_search=beam_search)

        # Convert text to tokenized format
        tokenized_input = tokenizer.tokenize(input_text)
        
        cause_text1 = mark_text_by_tokens(tokenizer, tokenized_input, start_cause1, end_cause1, "#FFD700")  # Gold for cause
        effect_text1 = mark_text_by_tokens(tokenizer, tokenized_input, start_effect1, end_effect1, "#90EE90")  # Light green for effect
        signal_text = mark_text_by_tokens(tokenizer, tokenized_input, start_signal, end_signal, "#FF6347")  # Tomato red for signal

        # Display first relation
        st.markdown(f"<strong>Relation 1:</strong>", unsafe_allow_html=True)
        st.markdown(f"**Cause:** {cause_text1}", unsafe_allow_html=True)
        st.markdown(f"**Effect:** {effect_text1}", unsafe_allow_html=True)
        st.markdown(f"**Signal:** {signal_text}", unsafe_allow_html=True)

        # Display second relation if beam search is enabled
        if beam_search:
            cause_text2 = mark_text_by_tokens(tokenizer, tokenized_input, start_cause2, end_cause2, "#FFD700")
            effect_text2 = mark_text_by_tokens(tokenizer, tokenized_input, start_effect2, end_effect2, "#90EE90")

            st.markdown(f"<strong>Relation 2:</strong>", unsafe_allow_html=True)
            st.markdown(f"**Cause:** {cause_text2}", unsafe_allow_html=True)
            st.markdown(f"**Effect:** {effect_text2}", unsafe_allow_html=True)
            st.markdown(f"**Signal:** {signal_text}", unsafe_allow_html=True)
    else:
        st.warning("Please enter some text before extracting.")