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app.py

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+import os
+import re
+import requests
+import torch
+import torch.nn as nn
+import numpy as np
+import gradio as gr
+from transformers import AutoTokenizer, AutoModel
+from tqdm import tqdm  # Just for download progress bar
+
+# ==========================================
+# 1. CONFIGURATION
+# ==========================================
+MODEL_URL = "https://huggingface.co/datasets/mahmoudmohammad/Propaganda_Detection/resolve/main/paper_arch_asl_uw_marbertv2_raw-data.bin"
+MODEL_FILENAME = "paper_arch_asl_uw_marbertv2_raw-data.bin"
+MODEL_NAME = "UBC-NLP/MARBERTv2"
+MAX_LEN = 256
+TASK_EMBED_DIM = 128
+DEVICE = torch.device("cuda" if torch.cuda.is_available() else "cpu")
+
+# --- Classes (Hardcoded as per your dataset) ---
+PROP_CLASSES = [
+    'Appeal to authority', 'Appeal to fear/prejudice', 'Appeal to time', 
+    'Bandwagon', 'Black-and-white Fallacy/Dictatorship', 
+    'Causal Oversimplification', 'Doubt', 'Exaggeration/Minimisation', 
+    'Flag-waving', 'Glittering generalities (Virtue)', 'Loaded Language', 
+    "Misrepresentation of Someone's Position (Straw Man)", 
+    'Name calling/Labeling', 'Obfuscation, Intentional vagueness, Confusion', 
+    'Presenting Irrelevant Data (Red Herring)', 'Repetition', 'Slogans', 
+    'Smears', 'Thought-terminating cliché', 'Whataboutism'
+]
+
+EMO_CLASSES = [
+    'anger', 'annoyance', 'anticipation', 'anxiety', 'confusion', 'denial', 
+    'disgust', 'empathy', 'fear', 'gratitude', 'humor', 'joy', 'love', 
+    'neutral', 'optimism', 'pessimism', 'sadness', 'surprise', 
+    'sympathy', 'trust'
+]
+
+# ==========================================
+# 2. HELPER: DOWNLOADER
+# ==========================================
+def download_model_if_missing():
+    if not os.path.exists(MODEL_FILENAME):
+        print(f"📥 Model file not found. Downloading from Hugging Face...")
+        print(f"   URL: {MODEL_URL}")
+        
+        try:
+            response = requests.get(MODEL_URL, stream=True)
+            response.raise_for_status() # Check for error
+            
+            total_size = int(response.headers.get('content-length', 0))
+            block_size = 1024 # 1 Kilobyte
+            
+            with open(MODEL_FILENAME, "wb") as file, tqdm(
+                desc=MODEL_FILENAME,
+                total=total_size,
+                unit='iB',
+                unit_scale=True,
+                unit_divisor=1024,
+            ) as bar:
+                for data in response.iter_content(block_size):
+                    size = file.write(data)
+                    bar.update(size)
+            print("\n✅ Download complete.")
+            
+        except Exception as e:
+            print(f"\n❌ Failed to download model: {e}")
+            raise
+    else:
+        print(f"✅ Model file '{MODEL_FILENAME}' already exists.")
+
+# ==========================================
+# 3. PREPROCESSING
+# ==========================================
+def preprocess_text(text):
+    if not isinstance(text, str): return ""
+    text = re.sub(r'http\S+|www\S+', '[URL]', text)
+    text = re.sub(r'@\w+', '[USER]', text)
+    text = re.sub(r'[a-zA-Z]', '', text)
+    text = re.sub("[إأآ]", "ا", text)
+    text = re.sub("ة", "ه", text)
+    text = re.sub("ى", "ي", text)
+    text = re.sub(r'[\u0617-\u061A\u064B-\u0652]', '', text)
+    return text.strip()
+
+# ==========================================
+# 4. MODEL ARCHITECTURE
+# ==========================================
+class AlHenakiMTLModel(nn.Module):
+    def __init__(self, n_propaganda, n_emotion):
+        super(AlHenakiMTLModel, self).__init__()
+        self.arabert = AutoModel.from_pretrained(MODEL_NAME)
+        self.hidden_size = 768
+        self.task_embedding = nn.Embedding(num_embeddings=2, embedding_dim=TASK_EMBED_DIM)
+        self.head_input_dim = self.hidden_size + TASK_EMBED_DIM
+        self.prop_head = nn.Linear(self.head_input_dim, n_propaganda)
+        self.emo_head  = nn.Linear(self.head_input_dim, n_emotion)
+        # Weights used during training loss calc, kept here for structure compatibility
+        self.log_sigma_prop = nn.Parameter(torch.zeros(1))
+        self.log_sigma_emo = nn.Parameter(torch.zeros(1))
+
+    def forward(self, input_ids, attention_mask, task_ids):
+        outputs = self.arabert(input_ids, attention_mask=attention_mask)
+        pooled_output = outputs.pooler_output
+        t_embed = self.task_embedding(task_ids)
+        z = torch.cat((pooled_output, t_embed), dim=1)
+        
+        current_task = task_ids[0].item()
+        if current_task == 0:
+            return self.prop_head(z), self.log_sigma_prop
+        elif current_task == 1:
+            return self.emo_head(z), self.log_sigma_emo
+        else:
+            raise ValueError("Unknown Task ID")
+
+# ==========================================
+# 5. INITIALIZE GLOBALS
+# ==========================================
+# 1. Download
+download_model_if_missing()
+
+# 2. Load Components
+print("⏳ Loading Tokenizer & Model...")
+tokenizer = AutoTokenizer.from_pretrained(MODEL_NAME)
+model = AlHenakiMTLModel(len(PROP_CLASSES), len(EMO_CLASSES))
+
+# 3. Load Weights
+try:
+    state_dict = torch.load(MODEL_FILENAME, map_location=DEVICE)
+    model.load_state_dict(state_dict)
+    model.to(DEVICE)
+    model.eval()
+    print("✅ Model loaded successfully on", DEVICE)
+except Exception as e:
+    print(f"❌ Critical Error Loading Model: {e}")
+
+# ==========================================
+# 6. INFERENCE LOGIC
+# ==========================================
+def predict_fn(text, threshold):
+    clean_text = preprocess_text(text)
+    
+    # Empty check
+    if not clean_text.strip():
+        return {}, {}, "Please enter Arabic text."
+
+    # Tokenize
+    inputs = tokenizer(
+        clean_text, 
+        return_tensors="pt", 
+        max_length=MAX_LEN, 
+        padding="max_length", 
+        truncation=True
+    ).to(DEVICE)
+    
+    input_ids = inputs['input_ids']
+    attn_mask = inputs['attention_mask']
+
+    with torch.no_grad():
+        # Propaganda
+        task_ids_p = torch.tensor([0] * input_ids.shape[0], dtype=torch.long).to(DEVICE)
+        logits_p, _ = model(input_ids, attn_mask, task_ids_p)
+        probs_p = torch.sigmoid(logits_p).cpu().numpy()[0]
+
+        # Emotions
+        task_ids_e = torch.tensor([1] * input_ids.shape[0], dtype=torch.long).to(DEVICE)
+        logits_e, _ = model(input_ids, attn_mask, task_ids_e)
+        probs_e = torch.sigmoid(logits_e).cpu().numpy()[0]
+
+    # Format for Gradio Label Output ({Label: Score})
+    # Filter by threshold AND convert numpy float to native float
+    prop_results = {
+        PROP_CLASSES[i]: float(probs_p[i]) 
+        for i in range(len(probs_p)) if probs_p[i] > threshold
+    }
+    
+    emo_results = {
+        EMO_CLASSES[i]: float(probs_e[i]) 
+        for i in range(len(probs_e)) if probs_e[i] > threshold
+    }
+    
+    return prop_results, emo_results, f"Processed: {len(clean_text)} chars"
+
+# ==========================================
+# 7. MODERN UI (GRADIO)
+# ==========================================
+custom_css = """
+body { background-color: #f5f7fa; }
+.container { max-width: 900px; margin: auto; padding-top: 20px; }
+"""
+
+with gr.Blocks(theme=gr.themes.Soft(), css=custom_css, title="AraProp Detector") as demo:
+    gr.Markdown(
+        """
+        # 🕵️‍♂️ Multi-Task Arabic Propaganda & Emotion Detector
+        ### Based on AraBERT-v02 | SOTA Reproduction
+        """
+    )
+    
+    with gr.Row():
+        with gr.Column(scale=1):
+            input_text = gr.Textbox(
+                lines=5, 
+                placeholder="أدخل النص هنا للتحليل...", 
+                label="Input Arabic Text",
+                value="يا له من عار! هذا السياسي يدمر البلاد بخططه الشيطانية الفاشلة."
+            )
+            
+            threshold_slider = gr.Slider(
+                minimum=0.0, 
+                maximum=1.0, 
+                value=0.4, 
+                step=0.05, 
+                label="Confidence Threshold (Sensitivity)"
+            )
+            
+            run_btn = gr.Button("Analyze Text 🚀", variant="primary")
+            status_box = gr.Markdown("Ready...")
+
+        with gr.Column(scale=1):
+            gr.Markdown("### 📊 Detection Results")
+            # We use 'Label' components which give nice progress bars
+            out_prop = gr.Label(num_top_classes=8, label="Propaganda Techniques")
+            out_emo = gr.Label(num_top_classes=8, label="Underlying Emotions")
+
+    # Connect components
+    run_btn.click(
+        fn=predict_fn, 
+        inputs=[input_text, threshold_slider], 
+        outputs=[out_prop, out_emo, status_box]
+    )
+
+    gr.Markdown("---")
+    gr.Markdown(f"Running on: {DEVICE} | Model: {MODEL_NAME}")
+
+# ==========================================
+# 8. LAUNCH
+# ==========================================
+if __name__ == "__main__":
+    # share=True creates a public link for RunPod/Colab
+    demo.launch(share=True, show_error=True)

requirements.txt

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+torch
+transformers
+gradio
+numpy
+requests
+tqdm