| import os
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|
|
| os.environ["OMP_NUM_THREADS"] = "1"
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| os.environ["TOKENIZERS_PARALLELISM"] = "false"
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|
|
| import streamlit as st
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| import pandas as pd
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| import warnings
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| import numpy as np
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| import matplotlib.pyplot as plt
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| import seaborn as sns
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|
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| from bertopic import BERTopic
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| from bertopic.representation import MaximalMarginalRelevance, KeyBERTInspired
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| from sentence_transformers import SentenceTransformer, models
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| from sklearn.feature_extraction.text import CountVectorizer
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| from sklearn.decomposition import PCA
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| from sklearn.cluster import KMeans
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| from sklearn.metrics import silhouette_score
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| from umap import UMAP
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| from hdbscan import HDBSCAN
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| import gensim.corpora as corpora
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| from gensim.models.coherencemodel import CoherenceModel
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|
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| warnings.filterwarnings("ignore")
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|
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|
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| st.set_page_config(page_title="Topic Modeling Pipeline", layout="wide", initial_sidebar_state="collapsed")
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|
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| EMBEDDING_MAP = {
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| "MiniLM (Fast & Lightweight)": "sentence-transformers/all-MiniLM-L6-v2",
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| "MPNet (High Accuracy)": "sentence-transformers/all-mpnet-base-v2",
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| "Specter2 (Scientific/Academic)": "allenai/specter2_base"
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| }
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|
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| POOLING_MAP = {
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| "Mean (Smooth context)": "mean",
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| "Max (Sharp keywords)": "max",
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| "CLS (Classification)": "cls",
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| "Mean-Max (Combined)": "mean-max"
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| }
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|
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| @st.cache_resource
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| def load_embedder(model_name, pool_strat):
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| word_emb = models.Transformer(model_name)
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| pool_model = models.Pooling(
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| word_emb.get_word_embedding_dimension(),
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| pooling_mode_mean_tokens=("mean" in pool_strat),
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| pooling_mode_max_tokens=("max" in pool_strat),
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| pooling_mode_cls_token=("cls" in pool_strat)
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| )
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| return SentenceTransformer(modules=[word_emb, pool_model])
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|
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| st.title("🧠 BERTopic Topic Modeling Pipeline")
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|
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| try:
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| st.image("pipeline.png", use_container_width=True)
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| except FileNotFoundError:
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| pass
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|
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| st.divider()
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| st.header("📥 Step 0: Input Data & Core Settings")
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| data_source = st.radio("Choose Data Source:", ["Use Sample ACM Abstract", "Paste Text"], horizontal=True)
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|
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| sample_abstract = """
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| Students who registered for the Mapping with Google massive open online course (MOOC)
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| were asked several questions during the registration process to identify prior
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| experience with eleven skills as well as their goals for registering for the course.
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| At the end of the course, we compared students' self reports of goal achievement
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| with behavioral click-stream analysis. In addition, we assessed how well prior
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| skill in a subject predicts a student's course completion and found no correlation.
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| Our research shows that students who completed course activities were more likely
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| to earn certificates of completion than peers who did not.
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| """
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|
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| raw_data = st.text_area("Text Data:", value=sample_abstract if data_source == "Use Sample ACM Abstract" else "", height=150)
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|
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| col_a, col_b = st.columns(2)
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| with col_a:
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| n_themes = st.slider("Target Number of Themes", 2, 20, 3)
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| with col_b:
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| words_per_theme = st.slider("Words to Output per Theme", 3, 10, 5)
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|
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| st.header("⚙️ Model Configuration")
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|
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| with st.expander("1️⃣ Semantic Layer (Embeddings & Pooling)", expanded=True):
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| ui_embedding = st.selectbox("Embedding Model", list(EMBEDDING_MAP.keys()))
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| ui_pooling = st.selectbox("Pooling Strategy", list(POOLING_MAP.keys()))
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|
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| with st.expander("2️⃣ Geometry Layer (Dimensionality Reduction)", expanded=True):
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| ui_algo = st.selectbox("Algorithm", ["UMAP (Complex geometry)", "PCA (Fast/Deterministic)"])
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| if "UMAP" in ui_algo:
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| ui_metric = st.selectbox("Distance Metric", ["cosine", "euclidean", "manhattan"])
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| else:
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| ui_metric = "euclidean"
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| st.info("PCA inherently uses Variance (Euclidean math), so distance metrics are bypassed.")
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|
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| with st.expander("3️⃣ Clustering Layer (Grouping)", expanded=True):
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| st.markdown("""
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| *Clustering mathematically draws boundaries around similar sentences.*
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| * **Primary Engine (HDBSCAN):** Runs on datasets $\ge$ 15 sentences. Automatically filters outliers and finds dense semantic clouds.
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| *(Defaults: min_cluster_size=10, cluster_selection_method='eom', metric='euclidean')*
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| * **Fallback Engine (K-Means):** Runs on datasets $<$ 15 sentences. Forces all sentences into buckets to prevent math crashes on tiny text samples.
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| *(Defaults: n_clusters = Target Themes, random_state=42)*
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| """)
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|
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| with st.expander("4️⃣ Vocabulary Layer (Vectorization)", expanded=True):
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| ngram_range = st.slider("N-Gram Range", 1, 3, (1, 2), help="1=Unigrams, 2=Bigrams (e.g., 'machine learning')")
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|
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| auto_noise = st.checkbox(
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| "Auto-Remove Redundant Noise (max_df)",
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| value=True,
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| help="Mathematically deletes words that appear in more than 85% of the documents."
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| )
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| st.caption("Deletes overly common words (like 'paper' or 'study') that appear everywhere, preventing generic filler from dominating your themes.")
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|
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| with st.expander("5️⃣ Extraction Layer (Representation)", expanded=True):
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| ui_extraction = st.selectbox("Strategy", ["c-TF-IDF (Word frequency)", "KeyBERTInspired (Semantic cosine)", "MMR (Reduce redundancy)"])
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| if "MMR" in ui_extraction:
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| mmr_diversity = st.slider("MMR Diversity Penalty", 0.0, 1.0, 0.3)
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| else:
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| mmr_diversity = None
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|
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| st.header("📊 Evaluation Metrics")
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| eval_metrics = st.multiselect(
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| "Select KPIs to generate a final report card:",
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| ["Topic Diversity", "NPMI Coherence", "Silhouette Score"],
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| default=["Topic Diversity", "NPMI Coherence", "Silhouette Score"]
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| )
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| st.divider()
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|
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|
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| if st.button("🚀 Run Topic Modeling Pipeline", type="primary", use_container_width=True):
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|
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| if not raw_data or len(raw_data) < 20:
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| st.error("Please provide more text data!")
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| st.stop()
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| with st.spinner("Processing Semantic Pipeline... (Models are cached to prevent crashes)"):
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|
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| sentences = [s.strip() for s in raw_data.split('.') if len(s.strip()) > 10]
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| dataset_size = len(sentences)
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|
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| academic_noise = ['students', 'course', 'research', 'paper', 'found', 'likely', 'did']
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| from sklearn.feature_extraction import text
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| stop_w = list(text.ENGLISH_STOP_WORDS.union(academic_noise))
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|
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| vectorizer_model = CountVectorizer(stop_words=stop_w, ngram_range=ngram_range, max_df=0.85 if auto_noise and dataset_size > 10 else 1.0)
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|
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| custom_embedder = load_embedder(EMBEDDING_MAP[ui_embedding], POOLING_MAP[ui_pooling])
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| embeddings = custom_embedder.encode(sentences)
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|
|
|
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| is_fallback = False
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| if dataset_size < 15 or "PCA" in ui_algo:
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| safe_n_themes = min(n_themes, dataset_size)
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| dim_model = PCA(n_components=2, random_state=42)
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| cluster_model = KMeans(n_clusters=safe_n_themes, random_state=42)
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| reduce_topics = None
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| is_fallback = True
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| algo_used = "PCA"
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| cluster_algo = "K-Means"
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| else:
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| dim_model = UMAP(n_neighbors=15, n_components=5, metric=ui_metric, random_state=42)
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| clustering_model = HDBSCAN(min_cluster_size=10, metric='euclidean', cluster_selection_method='eom')
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| reduce_topics = n_themes
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| algo_used = "UMAP"
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| cluster_algo = "HDBSCAN"
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|
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|
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| if "MMR" in ui_extraction:
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| rep_model = MaximalMarginalRelevance(diversity=mmr_diversity, top_n_words=words_per_theme)
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| elif "KeyBERT" in ui_extraction:
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| rep_model = KeyBERTInspired(top_n_words=words_per_theme)
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| else:
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| rep_model = None
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|
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| topic_model = BERTopic(
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| embedding_model=custom_embedder,
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| umap_model=dim_model,
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| hdbscan_model=cluster_model,
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| vectorizer_model=vectorizer_model,
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| representation_model=rep_model,
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| nr_topics=reduce_topics,
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| top_n_words=words_per_theme,
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| language="english"
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| )
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| topics, _ = topic_model.fit_transform(sentences)
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|
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|
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| st.success("Analysis Complete!")
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|
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| if is_fallback:
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| if safe_n_themes < n_themes:
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| st.warning(f"⚠️ **Reduced requested themes from {n_themes} to {safe_n_themes}.**\n\n"
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| f"*The Math Explanation:* BERTopic clusters complete sentences to preserve context. "
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| f"You cannot sort {dataset_size} sentences into {n_themes} buckets without leaving empty buckets, "
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| f"which mathematically breaks the clustering algorithms!")
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| else:
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| st.info(f"ℹ️ Auto-switched to PCA/K-Means due to small dataset size ({dataset_size} sentences).")
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|
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| st.markdown("### 🏆 Discovered Themes")
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| topic_info = topic_model.get_topic_info()
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| all_words = []
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|
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| cols = st.columns(3)
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| col_idx = 0
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| for t_id in topic_info['Topic']:
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| if t_id == -1: continue
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| theme_w = [w[0] for w in topic_model.get_topic(t_id)]
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| all_words.append(theme_w)
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| with cols[col_idx % 3]:
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| st.info(f"**Theme {t_id + 1}**\n\n" + "\n".join([f"🔹 {w}" for w in theme_w]))
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| col_idx += 1
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|
|
|
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| div_val, npmi_val, sil_val = 0.0, 0.0, 0.0
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|
|
| if len(eval_metrics) > 0:
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| st.markdown("### 📊 Key Performance Indicators (KPI)")
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|
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| with st.spinner("Calculating mathematical metrics... (NPMI requires building a dictionary and takes a moment)"):
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|
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| for metric in eval_metrics:
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| if "Diversity" in metric:
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| if len(all_words) > 0:
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| u_words = set([w for t in all_words for w in t])
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| t_words = sum([len(t) for t in all_words])
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| div_val = len(u_words) / t_words if t_words > 0 else 0
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| st.metric("Topic Diversity (Target: 1.0)", f"{div_val:.2f}")
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| else:
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| st.metric("Topic Diversity", "Skipped")
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|
|
| elif "NPMI" in metric:
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| try:
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| tokenized = [vectorizer_model.build_analyzer()(s) for s in sentences]
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| dictionary = corpora.Dictionary(tokenized)
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| cm = CoherenceModel(topics=all_words, texts=tokenized, dictionary=dictionary, coherence='c_npmi')
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| temp_npmi = cm.get_coherence()
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| if np.isnan(temp_npmi):
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| st.metric("NPMI Coherence", "N/A (Too few words)")
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| else:
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| npmi_val = float(temp_npmi)
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| st.metric("NPMI Coherence (Target: >0.1)", f"{npmi_val:.2f}")
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| except Exception:
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| st.metric("NPMI Coherence", "Skipped (Data too small)")
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|
|
| elif "Silhouette" in metric:
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| valid_idx = [i for i, t in enumerate(topics) if t != -1]
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| unique_topics = set([topics[i] for i in valid_idx])
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|
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| if 1 < len(unique_topics) < len(valid_idx):
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| sil_val = float(silhouette_score(
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| np.array([embeddings[i] for i in valid_idx]),
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| [topics[i] for i in valid_idx],
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| metric='cosine'
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| ))
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| st.metric("Silhouette Score (Target: >0.0)", f"{sil_val:.2f}")
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| else:
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| st.metric("Silhouette Score", "Skipped (Themes need ≥2 sentences each)")
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|
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| st.markdown("### 📈 Explainable AI (XAI) Architecture Map")
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|
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| with st.spinner("Rendering Explainable AI Dashboard..."):
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| sns.set_theme(style="whitegrid")
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| fig = plt.figure(figsize=(16, 14))
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| fig.suptitle(f"Topic Modeling Pipeline Analytics\n(Pooling: {ui_pooling.split()[0]} | Rep: {ui_extraction.split()[0]})", fontsize=20, fontweight='bold', y=0.98)
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| box_style = dict(boxstyle="round,pad=0.4", facecolor='lightyellow', edgecolor='orange', alpha=0.9)
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|
|
|
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| ax1 = plt.subplot(3, 2, 1)
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| sns.heatmap(embeddings[:, :50], cmap="viridis", cbar=False, ax=ax1)
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| ax1.set_title("STEP 1: Embeddings & Pooling", fontsize=13, fontweight='bold')
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| ax1.set_ylabel("Sentences")
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| ax1.set_xlabel("Vector Dimensions (First 50 shown)")
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| ax1.text(0.5, -0.25, f"Math: {ui_embedding.split()[0]} encodes text into 384D.\nPooling '{ui_pooling.split()[0]}' squashes word vectors into 1 sentence vector.",
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| fontsize=10, ha='center', va='top', transform=ax1.transAxes, bbox=box_style)
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|
|
|
|
| ax2 = plt.subplot(3, 2, 2)
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| reduced_embeddings = topic_model.umap_model.transform(embeddings)
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| ax2.scatter(reduced_embeddings[:, 0], reduced_embeddings[:, 1], c='grey', s=100, alpha=0.6, edgecolor='k')
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| ax2.set_title(f"STEP 2: Geometry ({algo_used})", fontsize=13, fontweight='bold')
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| ax2.text(0.5, -0.25, f"Math: {algo_used} reduces 384D vectors into a 2D map.\nPlaces similar sentences close together.",
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| fontsize=10, ha='center', va='top', transform=ax2.transAxes, bbox=box_style)
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|
|
|
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| ax3 = plt.subplot(3, 2, 3)
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| ax3.scatter(reduced_embeddings[:, 0], reduced_embeddings[:, 1], c=topics, cmap='tab10', s=150, edgecolor='k')
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| ax3.set_title(f"STEP 3: Clustering ({cluster_algo})", fontsize=13, fontweight='bold')
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| ax3.text(0.5, -0.25, f"Math: {cluster_algo} scans the 2D space to draw boundaries.\nColors represent assigned semantic clusters.",
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| fontsize=10, ha='center', va='top', transform=ax3.transAxes, bbox=box_style)
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|
|
|
|
| ax4 = plt.subplot(3, 2, 4)
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| theme_1_data = topic_model.get_topic(0)
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| if theme_1_data:
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| words = [x[0] for x in theme_1_data][::-1]
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| scores = [x[1] for x in theme_1_data][::-1]
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| ax4.barh(words, scores, color='coral', edgecolor='black')
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| ax4.set_title(f"STEP 4: Topic Representation ({ui_extraction.split()[0]})", fontsize=13, fontweight='bold')
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| ax4.text(0.5, -0.25, f"Math: Applies {ui_extraction.split()[0]} to rank vocabulary.\nLonger bars = higher semantic relevance.",
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| fontsize=10, ha='center', va='top', transform=ax4.transAxes, bbox=box_style)
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| else:
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| ax4.text(0.5, 0.5, "Theme not found", ha='center', transform=ax4.transAxes)
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|
|
|
|
| ax5 = plt.subplot(3, 2, 5)
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| ax5.axis('off')
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| ax5.set_title("STEP 5: Key Performance Indicators (KPI)", fontsize=13, fontweight='bold', y=0.9)
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|
|
| div_str = f"{div_val:.2f}" if div_val > 0 else "Skipped"
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| npmi_str = f"{npmi_val:.2f}" if npmi_val != 0.0 else "Skipped"
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| sil_str = f"{sil_val:.2f}" if sil_val != 0.0 else "Skipped"
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|
|
| kpi_text = (
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| f"📊 Topic Diversity: {div_str} (Target: 1.0)\n\n"
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| f"🧠 NPMI Coherence: {npmi_str} (Target: >0.1)\n\n"
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| f"📐 Silhouette Score: {sil_str} (Target: >0.0)"
|
| )
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| ax5.text(0.5, 0.4, kpi_text, fontsize=12, va='center', ha='center',
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| bbox=dict(boxstyle="square,pad=1.5", facecolor='#e6f2ff', edgecolor='#377eb8', lw=2))
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| ax5.text(0.5, -0.15, "Math: Since pipeline algorithms don't use 'Training Loss',\nthese KPIs provide the absolute mathematical grade of the topics.",
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| fontsize=10, ha='center', va='top', transform=ax5.transAxes, bbox=box_style)
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|
|
|
|
| ax6 = plt.subplot(3, 2, 6)
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| ax6.axis('off')
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| summary_text = (
|
| "=== PIPELINE ARCHITECTURE ===\n\n"
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| f"1. Embeddings: {ui_embedding.split()[0]}\n"
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| f"2. Pooling: {ui_pooling.split()[0]}\n"
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| f"3. N-Grams: {ngram_range}\n"
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| f"4. Geometry: {algo_used}\n"
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| f"5. Clustering: {cluster_algo}\n"
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| f"6. Representation: {ui_extraction.split()[0]}\n\n"
|
| "This modular pipeline successfully transforms unstructured text\n"
|
| "into mathematically validated semantic domains."
|
| )
|
| ax6.text(0.1, 0.5, summary_text, fontsize=12, va='center', ha='left',
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| bbox=dict(boxstyle="square,pad=1", facecolor='#f0f0f0', edgecolor='grey', lw=2))
|
|
|
| plt.subplots_adjust(hspace=0.6, wspace=0.3)
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| st.pyplot(fig) |
