1 files changed, 41 insertions, 0 deletions
diff --git a/baselines/bm25_top1.py b/baselines/bm25_top1.py
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+"""BM25-Top1 baseline: retrieve the most relevant support item and use it as in-context example."""
+
+from rank_bm25 import BM25Okapi
+from data.templates import build_prompt_with_examples
+
+
+def bm25_select_top1(query_input: str, support_items: list) -> list:
+    """Select the most relevant support item using BM25.
+
+    Args:
+        query_input: The query text
+        support_items: Available support items
+
+    Returns:
+        List containing the single most relevant support item
+    """
+    if len(support_items) <= 1:
+        return support_items
+
+    # Build corpus from support inputs + outputs
+    corpus = []
+    for item in support_items:
+        doc = item['support_input'] + " " + item['support_output']
+        corpus.append(doc.lower().split())
+
+    bm25 = BM25Okapi(corpus)
+    query_tokens = query_input.lower().split()
+    scores = bm25.get_scores(query_tokens)
+
+    best_idx = scores.argmax()
+    return [support_items[best_idx]]
+
+
+def generate_bm25_top1(wrapper, query_input: str, support_items: list,
+                        task: str, max_new_tokens: int = 512,
+                        temperature: float = 0.7, top_p: float = 0.9) -> str:
+    """Generate with BM25-Top1 baseline."""
+    selected = bm25_select_top1(query_input, support_items)
+    prompt = build_prompt_with_examples(query_input, selected, task)
+    return wrapper.generate_base(prompt, max_new_tokens=max_new_tokens,
+                                  temperature=temperature, top_p=top_p)