src/streamlit_app.py

import streamlit as st

DEBUG_MINIMAL = False  # Set to False to run the full app


if DEBUG_MINIMAL:
    st.write("Streamlit app file loaded")
    st.title("Plant Disease Classifier")
    st.write("Minimal debug mode: Streamlit is working!")
else:
    from PIL import Image
    import torch
    import io
    import os
    import json
    from transformers import AutoImageProcessor, AutoModelForImageClassification
    from model_paths import resolve_model_dir

    # Model directory
    MODEL_DIR = resolve_model_dir()

    st.title("Plant Disease Classifier")
    st.write("App is starting...")
    st.write("b4 uploaded_file")
    uploaded_file = st.file_uploader(
        "Upload a plant image", type=["jpg", "jpeg", "png"])
    st.write("after uploaded_file")
    if uploaded_file is not None:
        # Load model and processor only when needed
        @st.cache_resource
        def load_model_and_processor():
            model = AutoModelForImageClassification.from_pretrained(MODEL_DIR)
            processor = AutoImageProcessor.from_pretrained(MODEL_DIR)
            model.eval()
            device = torch.device(
                "cuda" if torch.cuda.is_available() else "cpu")
            model.to(device)
            return model, processor, device
        st.write("Loading model and processor...")
        model, processor, device = load_model_and_processor()

        # Load class mapping
        with open(os.path.join(MODEL_DIR, "class_mapping.json")) as f:
            class_mapping = json.load(f)
            idx_to_class = {v: k for k, v in class_mapping.items()}
        st.write("Model and processor loaded.")
        image = Image.open(uploaded_file).convert("RGB")
        st.image(image, caption="Uploaded Image", use_column_width=True)
        st.write("Image uploaded and displayed.")
        inputs = processor(images=image, return_tensors="pt")
        inputs = {k: v.to(device) for k, v in inputs.items()}
        st.write("Inputs processed, running inference...")
        with torch.no_grad():
            outputs = model(**inputs)
            pred_idx = torch.argmax(outputs.logits, dim=1).item()
            pred_class = idx_to_class[pred_idx]
            confidence = torch.softmax(outputs.logits, dim=1)[
                0, pred_idx].item()

        st.markdown(f"**Prediction:** {pred_class}")
        st.markdown(f"**Confidence:** {confidence:.2f}")