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# classifier.py
import torch
from model_loader import classifier_model, classifier_tokenizer
from paraphraser import paraphrase_comment
from metrics import compute_semantic_similarity, compute_emotion_shift, compute_empathy_score
def classify_toxic_comment(comment):
"""
Classify a comment as toxic or non-toxic using the fine-tuned XLM-RoBERTa model.
If toxic, paraphrase the comment, re-evaluate, and compute additional Stage 3 metrics.
Returns the prediction label, confidence, color, toxicity score, bias score, paraphrased comment (if applicable), and its metrics.
"""
if not comment.strip():
return "Error: Please enter a comment.", None, None, None, None, None, None, None, None, None, None, None, None, None
# Tokenize the input comment
inputs = classifier_tokenizer(comment, return_tensors="pt", truncation=True, padding=True, max_length=512)
# Run inference
with torch.no_grad():
outputs = classifier_model(**inputs)
logits = outputs.logits
# Get the predicted class (0 = non-toxic, 1 = toxic)
predicted_class = torch.argmax(logits, dim=1).item()
label = "Toxic" if predicted_class == 1 else "Non-Toxic"
confidence = torch.softmax(logits, dim=1)[0][predicted_class].item()
label_color = "red" if label == "Toxic" else "green"
# Compute Toxicity Score (approximated as the probability of the toxic class)
toxicity_score = torch.softmax(logits, dim=1)[0][1].item()
toxicity_score = round(toxicity_score, 2)
# Simulate Bias Score (placeholder)
bias_score = 0.01 if label == "Non-Toxic" else 0.15
bias_score = round(bias_score, 2)
# If the comment is toxic, paraphrase it and compute additional metrics
paraphrased_comment = None
paraphrased_prediction = None
paraphrased_confidence = None
paraphrased_color = None
paraphrased_toxicity_score = None
paraphrased_bias_score = None
semantic_similarity = None
original_emotion = None
paraphrased_emotion = None
emotion_shift_positive = None
empathy_score = None
if label == "Toxic":
# Paraphrase the comment
paraphrased_comment = paraphrase_comment(comment)
# Re-evaluate the paraphrased comment
paraphrased_inputs = classifier_tokenizer(paraphrased_comment, return_tensors="pt", truncation=True, padding=True, max_length=512)
with torch.no_grad():
paraphrased_outputs = classifier_model(**paraphrased_inputs)
paraphrased_logits = paraphrased_outputs.logits
paraphrased_predicted_class = torch.argmax(paraphrased_logits, dim=1).item()
paraphrased_label = "Toxic" if paraphrased_predicted_class == 1 else "Non-Toxic"
paraphrased_confidence = torch.softmax(paraphrased_logits, dim=1)[0][paraphrased_predicted_class].item()
paraphrased_color = "red" if paraphrased_label == "Toxic" else "green"
paraphrased_toxicity_score = torch.softmax(paraphrased_logits, dim=1)[0][1].item()
paraphrased_toxicity_score = round(paraphrased_toxicity_score, 2)
paraphrased_bias_score = 0.01 if paraphrased_label == "Non-Toxic" else 0.15 # Placeholder
paraphrased_bias_score = round(paraphrased_bias_score, 2)
# Compute additional Stage 3 metrics
semantic_similarity = compute_semantic_similarity(comment, paraphrased_comment)
original_emotion, paraphrased_emotion, emotion_shift_positive = compute_emotion_shift(comment, paraphrased_comment)
empathy_score = compute_empathy_score(paraphrased_comment)
return (
f"Prediction: {label}", confidence, label_color, toxicity_score, bias_score,
paraphrased_comment, f"Prediction: {paraphrased_label}" if paraphrased_comment else None,
paraphrased_confidence, paraphrased_color, paraphrased_toxicity_score, paraphrased_bias_score,
semantic_similarity, f"Original: {original_emotion}, Paraphrased: {paraphrased_emotion}, Positive Shift: {emotion_shift_positive}" if original_emotion else None,
empathy_score
) |