Exposed concept browser and added docs with example

Author: x-tabdeveloping

docs/concept_induction.md

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+# Concept Induction (BETA)
+
+Concept induction is the idea that higher-level concepts can be discovered and described in detail in corpora using the power of Large Language Models ([Lam et al. 2024](https://arxiv.org/abs/2404.12259)).
+These high-level concepts in corpora can also be discovered from particular angles, using seeds.
+The original study, and the [Lloom package](https://stanfordhci.github.io/lloom/) uses LLMs all the way, and therefore requires excessive computational resources, and aggressive down-sampling of the original corpus.
+
+In order to account for this scalability issue, we use a [seeded topic model](seeded.md) ([KeyNMF](keynmf.md)) to discover the concepts, and only use LLMs to describe and use them.
+This allows us to get similar results to Lloom with a fraction of the costs.
+
+In addition, we allow users to generate a **Concept Browser** programmatically, with which these concepts and their related documents can be explored.
+
+<figure>
+  <iframe src="../images/concept_induction.html", title="Concepts discovered on the political ideologies dataset", style="height:1000px;width:1200px;padding:0px;border:none;"></iframe>
+  <figcaption> Figure 1: Concepts discovered on the political ideologies dataset. </figcaption>
+</figure>
+
+## Example Usage
+
+The example bellow uses a synthetically generated political ideologies dataset, that we examine from the following angles:
+
+  - Taxation
+  - Stance on immigration
+  - Environmental policy
+
+We use an OpenAI analyzer and KeyNMF, with the `paraphrase-MiniLM-L12-v2` embedding model.
+The code runs in about ten minutes.
+
+Install dependencies and set API Key:
+
+```bash
+pip install turftopic[openai] datasets
+export OPENAI_API_KEY="sk-<your API key here>"
+```
+
+```python
+import numpy as np
+from datasets import load_dataset
+from sentence_transformers import SentenceTransformer
+
+from turftopic import KeyNMF, create_concept_browser
+from turftopic.analyzers import OpenAIAnalyzer
+
+# Loading the dataset from huggingface
+ds = load_dataset("JyotiNayak/political_ideologies", split="train")
+corpus = list(ds["statement"])
+
+# Embedding all documents in the corpus
+encoder = SentenceTransformer("paraphrase-MiniLM-L12-v2")
+embeddings = encoder.encode(corpus, show_progress_bar=True)
+
+# Running separate seeded KeyNMF models for each tab and saving them
+seeds = ["Taxation", "Stance on immigration", "Environmental policy"]
+models = []
+doc_topic = []
+for seed in seeds:
+    model = KeyNMF(
+        3, encoder=encoder, seed_phrase=seed, seed_exponent=2, random_state=42
+    )
+    doc_topic_matrix = model.fit_transform(corpus, embeddings=embeddings)
+    doc_topic.append(doc_topic_matrix)
+    models.append(model)
+
+# Calculating topic sizes
+sizes = []
+top_documents = []
+topic_sizes = []
+for doc_topic_matrix in doc_topic:
+    # We say that if a document has at least five percent of the max importance
+    # then it contains the topic
+    rescaled = doc_topic_matrix / doc_topic_matrix.max()
+    sizes = (rescaled >= 0.05).sum(axis=0)
+    topic_sizes.append(sizes)
+    # Finding representative documents for each topic
+    docs = []
+    for doc_t in rescaled.T:
+        # Extracting top 10 documents for each topic
+        top = np.argsort(-doc_t)[:10]
+        # Making sure only those documents get in,
+        # that we have marked to contain the topic
+        top = top[doc_t[top] >= 0.05]
+        docs.append([corpus[i] for i in top])
+    top_documents.append(docs)
+topic_sizes = np.stack(topic_sizes)
+
+# Running topic analysis on all models using GPT-5-Nano
+analyzer = OpenAIAnalyzer()
+analysis_results = []
+for model, docs in zip(models, top_documents):
+    res = analyzer.analyze_topics(
+        keywords=model.get_top_words(), documents=docs
+    )
+    analysis_results.append(res)
+
+# Creating the concept browser:
+browser = create_concept_browser(
+    seeds=seeds,
+    topic_names=[res.topic_names for res in analysis_results],
+    keywords=[model.get_top_words() for model in models],
+    topic_descriptions=[res.topic_descriptions for res in analysis_results],
+    topic_sizes=topic_sizes,
+    top_documents=top_documents,
+)
+browser.show()
+```
+
+_See Figure 1 for the results_
+
+## API reference
+
+::: turftopic._concept_browser.create_browser