app.py

import gradio as gr
from llm_classification import get_answer
from inference_demo import (
    predict_randomforest_2f, predict_xgboost_2f, predict_lightgbm_2f,
    predict_svm_2f, predict_decisiontree_2f, predict_naivebayes_2f,
    predict_logisticregression_2f,
    predict_randomforest_6f, predict_xgboost_6f, predict_lightgbm_6f,
    predict_svm_6f, predict_decisiontree_6f, predict_naivebayes_6f,
    predict_logisticregression_6f,
)

PREDICT_FUNCS = {
    ("Random Forest", "2-feature"): predict_randomforest_2f,
    ("XGBoost", "2-feature"): predict_xgboost_2f,
    ("LightGBM", "2-feature"): predict_lightgbm_2f,
    ("SVM", "2-feature"): predict_svm_2f,
    ("Decision Tree", "2-feature"): predict_decisiontree_2f,
    ("Naive Bayes", "2-feature"): predict_naivebayes_2f,
    ("Logistic Regression", "2-feature"): predict_logisticregression_2f,

    ("Random Forest", "6-feature"): predict_randomforest_6f,
    ("XGBoost", "6-feature"): predict_xgboost_6f,
    ("LightGBM", "6-feature"): predict_lightgbm_6f,
    ("SVM", "6-feature"): predict_svm_6f,
    ("Decision Tree", "6-feature"): predict_decisiontree_6f,
    ("Naive Bayes", "6-feature"): predict_naivebayes_6f,
    ("Logistic Regression", "6-feature"): predict_logisticregression_6f,
}

CLASSIFIERS = [
    "🔮 Gemini",
    "🌳 Random Forest",
    "⚡ XGBoost",
    "💡 LightGBM",
    "📈 SVM",
    "🌲 Decision Tree",
    "📊 Naive Bayes",
    "🧮 Logistic Regression",
    "🤝 Ensemble"
]
FEATURE_VERSIONS = ["2-feature", "6-feature"]

FEATURE_EXPLANATIONS = {
    "2-feature": (
        "### Supported Language\n"
        "Only **English** sentences are supported.\n\n"
        "### 2-feature version\n"
        "This version uses only 2 frequency-based features:\n"
        "  * x1 = Total frequency of words in the Positive class\n"
        "  * x2 = Total frequency of words in the Negative class"
    ),
    "6-feature": (
        "### Supported Language\n"
        "Only **English** sentences are supported.\n\n"
        "### 6-feature version\n"
        "This version uses 6 features:\n"
        "  * x1 = Total frequency of words in the Positive class\n"
        "  * x2 = Total frequency of words in the Negative class\n"
        "  * x3 = 1 if the word 'no' appears, else 0\n"
        "  * x4 = Count of 1st and 2nd person pronouns\n"
        "  * x5 = 1 if the tweet contains '!' else 0\n"
        "  * x6 = log(word count)"
    ),
}

def explain_features(version: str) -> str:
    return FEATURE_EXPLANATIONS[version]

def infer(clf: str, version: str, text: str):
    if not text.strip():
        return {"⚠️ Please enter a sentence": 1.0}, ""

    if clf == "🔮 Gemini":
        y = get_answer(text)
        return ({"Positive 😀": 1.0} if y == 1 else {"Negative 😞": 1.0}), ""

    if clf == "🤝 Ensemble":
        model_names = ["Random Forest", "XGBoost", "LightGBM", "SVM", "Decision Tree", "Naive Bayes", "Logistic Regression"]
        votes_detail, votes = [], []
        for m in model_names:
            func = PREDICT_FUNCS.get((m, version))
            if func:
                y = func(text)
                votes.append(y)
                votes_detail.append(f"- **{m}**: {'Positive 😀' if y == 1 else 'Negative 😞'}")
        if not votes:
            return {"No models available": 1.0}, ""

        pos, total = sum(votes), len(votes)
        neg = total - pos
        pos_pct = 100 * pos / total
        neg_pct = 100 * neg / total

        if pos > neg:
            label = {"Positive 😀": 1.0}
            final = "### Final Ensemble Result: **Positive 😀**"
        elif neg > pos:
            label = {"Negative 😞": 1.0}
            final = "### Final Ensemble Result: **Negative 😞**"
        else:
            label = {"Tie 🤔": 1.0}
            final = "### Final Ensemble Result: **Tie 🤔**"

        detail_md = (
            f"{final}\n\n"
            f"**Votes:** {pos} positive ({pos_pct:.1f}%) | {neg} negative ({neg_pct:.1f}%) out of {total} models.\n\n"
            f"**Individual model decisions:**\n" + "\n".join(votes_detail)
        )
        return label, detail_md

    base_name = (
        clf.replace("🌳 ","")
           .replace("⚡ ","")
           .replace("💡 ","")
           .replace("📈 ","")
           .replace("🌲 ","")
           .replace("📊 ","")
           .replace("🧮 ","")
    )
    func = PREDICT_FUNCS.get((base_name, version))
    if func is None:
        return {"Model not found": 1.0}, ""
    y = func(text)
    return ({"Positive 😀": 1.0} if y == 1 else {"Negative 😞": 1.0}), ""

with gr.Blocks(
    title="Sentiment Classifier Demo",
    css=".big-markdown {font-size: 1.2rem; min-height: 300px; overflow:auto;}"
) as demo:
    gr.Markdown("## Sentiment Classifier Demo")
    with gr.Row():
        clf = gr.Dropdown(choices=CLASSIFIERS, value="🔮 Gemini", label="Classifier (or Ensemble)")
        version = gr.Dropdown(choices=FEATURE_VERSIONS, value="2-feature", label="Feature Version (not used for gemini)")
    txt = gr.Textbox(label="Input sentence (English only)", placeholder="Type a sentence…")
    btn = gr.Button("Classify")
    out_label = gr.Label(label="Main Result")
    out_detail = gr.Markdown(elem_classes="big-markdown")
    explanation_box = gr.Markdown(FEATURE_EXPLANATIONS["2-feature"])
    version.change(fn=explain_features, inputs=version, outputs=explanation_box)
    btn.click(fn=infer, inputs=[clf, version, txt], outputs=[out_label, out_detail])
    gr.Markdown(
        "**Note:** This demo supports **English** sentences only. "
        "Choose '🤝 Ensemble' to see the combined decision from all classifiers, "
        "or choose '🔮 Gemini' to use the Gemini LLM-based classifier."
    )
if __name__ == "__main__":
    demo.launch()