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Alexander Sanchez commited on
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Parent(s): 2c07e6b
Evaluator udpdated
Browse files- evaluator.py +248 -54
evaluator.py
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────────────
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Métricas de calidad para las correcciones del sistema RAG.
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Uso:
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from evaluator import Evaluator
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ev = Evaluator()
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metrics = ev.evaluate_pair(htr="...", corrected="...", gt="...")
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"""
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import re
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from typing import List, Dict
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from knowledge_base import GRAFIA_PATTERNS
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@staticmethod
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def cer(reference: str, hypothesis: str) -> float:
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"""
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r, h = list(reference), list(hypothesis)
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return Evaluator._levenshtein(r, h) / max(len(r), 1)
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@staticmethod
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def wer(reference: str, hypothesis: str) -> float:
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"""
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r = reference.split()
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h = hypothesis.split()
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return Evaluator._levenshtein(r, h) / max(len(r), 1)
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@staticmethod
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def _levenshtein(seq1: list, seq2: list) -> int:
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m, n = len(seq1), len(seq2)
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dp = list(range(n + 1))
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for i in range(1, m + 1):
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# ── Detector de modernismos ──────────────────────────────────────────────
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@staticmethod
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def modernism_penalty(
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"""
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"""
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issues = []
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corr_lower = corrected.lower()
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for p in GRAFIA_PATTERNS:
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modern
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ancient_forms = [f.strip().lower() for f in p["ancient"].split("/")]
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#
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if modern in corr_lower and modern not in
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#
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issues.append({
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"modern":
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"ancient":
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"rule":
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})
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return {
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"count": len(issues),
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"issues": issues,
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"score":
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}
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# ── Evaluación de un par ─────────────────────────────────────────────────
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def evaluate_pair(
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self, htr: str, corrected: str, gt: str
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) -> Dict:
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"""
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Evalúa una
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"""
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wer_htr
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wer_corr = self.wer(gt, corrected)
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return {
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# ── Evaluación en batch ──────────────────────────────────────────────────
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def batch_evaluate(
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corrected=out["corrected"],
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gt=pair["gt"],
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)
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metrics["id"]
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metrics["htr"]
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metrics["corrected"] = out["corrected"]
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metrics["gt"]
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results.append(metrics)
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except Exception as e:
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print(f" ❌ Error en {pair['id']}: {e}")
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if not results:
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return {"error": "Sin resultados"}
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summary = {
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"n_evaluated":
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"avg_wer_before":
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}
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if verbose:
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print(f"\n
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print(f"
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print(f"
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return summary
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────────────
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Métricas de calidad para las correcciones del sistema RAG.
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Las tres comparaciones que realiza el evaluador:
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1. GT vs HTR → error de PARTIDA (qué tan malo era el HTR)
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2. GT vs Corregido → error FINAL (qué tan bueno es el RAG)
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3. HTR vs Corregido → MODERNISMOS (qué cambió el LLM, no debería modernizar)
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Un cer_improvement positivo significa que el RAG mejoró el texto.
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Un cer_improvement negativo significa que el LLM empeoró el texto.
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Métricas:
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- CER (Character Error Rate) : distancia Levenshtein a nivel carácter
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- WER (Word Error Rate) : distancia Levenshtein a nivel palabra
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- Modernism score : penalización por grafías s.XVI modernizadas
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- Regression score : detecta si el LLM empeoró respecto al HTR
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Uso:
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from evaluator import Evaluator
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ev = Evaluator()
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# Un solo par
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metrics = ev.evaluate_pair(htr="...", corrected="...", gt="...")
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print(ev.format_pair_report(metrics))
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# Batch
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report = ev.batch_evaluate(corrector, pairs[:50])
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"""
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import re
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from typing import List, Dict
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from knowledge_base import GRAFIA_PATTERNS
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@staticmethod
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def cer(reference: str, hypothesis: str) -> float:
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"""
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Character Error Rate: fracción de caracteres incorrectos.
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0.0 = perfecto, 1.0 = todo mal.
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Compara: reference (GT) vs hypothesis (HTR o Corregido).
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"""
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r, h = list(reference), list(hypothesis)
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return Evaluator._levenshtein(r, h) / max(len(r), 1)
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@staticmethod
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def wer(reference: str, hypothesis: str) -> float:
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"""
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Word Error Rate: fracción de palabras incorrectas.
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0.0 = perfecto, 1.0 = todo mal.
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Compara: reference (GT) vs hypothesis (HTR o Corregido).
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"""
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r = reference.split()
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h = hypothesis.split()
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return Evaluator._levenshtein(r, h) / max(len(r), 1)
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@staticmethod
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def _levenshtein(seq1: list, seq2: list) -> int:
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"""Distancia de edición mínima entre dos secuencias."""
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m, n = len(seq1), len(seq2)
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dp = list(range(n + 1))
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for i in range(1, m + 1):
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# ── Detector de modernismos ──────────────────────────────────────────────
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@staticmethod
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def modernism_penalty(htr: str, corrected: str) -> Dict:
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"""
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Comparación 3: HTR vs Corregido.
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Detecta formas modernas que el LLM introdujo y que NO estaban
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en el HTR original. Estas son correcciones incorrectas porque
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el sistema NO debe modernizar grafías del s.XVI.
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Ejemplo de error detectado:
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HTR: "fizo merçed"
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Corregido: "hizo merced" ← modernizó f→h y ç→c (INCORRECTO)
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score: 1.0 = sin modernismos, 0.0 = muchos modernismos
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"""
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issues = []
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htr_lower = htr.lower()
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corr_lower = corrected.lower()
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for p in GRAFIA_PATTERNS:
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modern = p["modern"].lower()
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ancient_forms = [f.strip().lower() for f in p["ancient"].split("/")]
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# El corregido tiene la forma moderna Y el HTR no la tenía
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if modern in corr_lower and modern not in htr_lower:
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# Además el HTR tampoco tenía la forma antigua
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# (si la tenía, es una expansión de abreviatura válida)
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if not any(af in htr_lower for af in ancient_forms):
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issues.append({
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"modern": p["modern"],
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"ancient": p["ancient"],
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"rule": p["rule"],
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"category": p.get("category", ""),
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})
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score = max(0.0, 1.0 - len(issues) * 0.1)
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return {
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"count": len(issues),
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"issues": issues,
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"score": round(score, 4),
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}
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# ── Detector de regresiones ──────────────────────────────────────────────
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@staticmethod
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def regression_check(htr: str, corrected: str, gt: str) -> Dict:
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"""
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Detecta si el LLM empeoró el texto respecto al HTR original.
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Un resultado positivo en cer_improvement no garantiza que todo
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esté bien — el LLM podría haber corregido unos errores e
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introducido otros. Esta función identifica palabras que estaban
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bien en el HTR y el LLM cambió incorrectamente.
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"""
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htr_words = htr.split()
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corr_words = corrected.split()
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gt_words = gt.split()
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regressions = []
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# Comparar palabra a palabra hasta el mínimo de las tres listas
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for i, gt_w in enumerate(gt_words):
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htr_w = htr_words[i] if i < len(htr_words) else ""
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corr_w = corr_words[i] if i < len(corr_words) else ""
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# El HTR estaba bien, el corregido está mal
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if htr_w == gt_w and corr_w != gt_w:
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regressions.append({
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"position": i,
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"gt": gt_w,
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"htr": htr_w, # correcto en HTR
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"corrected":corr_w, # empeorado por el LLM
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})
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return {
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"count": len(regressions),
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"regressions": regressions,
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}
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# ── Evaluación de un par ─────────────────────────────────────────────────
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def evaluate_pair(self, htr: str, corrected: str, gt: str) -> Dict:
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"""
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Evalúa una corrección con las tres comparaciones:
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Comparación 1 — GT vs HTR:
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Mide el error de partida. Cuánto se alejaba el HTR del GT.
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Comparación 2 — GT vs Corregido:
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Mide el error final. Cuánto se aleja la corrección del GT.
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cer_improvement > 0 → el RAG mejoró el texto
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cer_improvement < 0 → el RAG empeoró el texto
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Comparación 3 — HTR vs Corregido:
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Detecta modernismos introducidos por el LLM.
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El LLM NO debe cambiar grafías válidas del s.XVI.
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"""
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# ── Comparación 1: GT vs HTR (error de partida) ────────────────────
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cer_htr = self.cer(gt, htr)
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wer_htr = self.wer(gt, htr)
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# ── Comparación 2: GT vs Corregido (error final) ───────────────────
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cer_corr = self.cer(gt, corrected)
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wer_corr = self.wer(gt, corrected)
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cer_improvement = cer_htr - cer_corr # positivo = mejoró
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wer_improvement = wer_htr - wer_corr
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# Veredicto de la corrección
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if cer_improvement > 0.02:
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verdict = "✓ MEJORADO"
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elif cer_improvement < -0.02:
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verdict = "✗ EMPEORADO"
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else:
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verdict = "~ SIN CAMBIO SIGNIFICATIVO"
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# ── Comparación 3: HTR vs Corregido (modernismos) ─────────────────
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modernism = self.modernism_penalty(htr, corrected)
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regression = self.regression_check(htr, corrected, gt)
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return {
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# ── Error de partida (GT vs HTR) ──────────────────────────────
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"cer_before": round(cer_htr, 4),
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"wer_before": round(wer_htr, 4),
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# ── Error final (GT vs Corregido) ─────────────────────────────
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"cer_after": round(cer_corr, 4),
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"wer_after": round(wer_corr, 4),
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+
# ── Mejora neta ───────────────────────────────────────────────
|
| 209 |
+
"cer_improvement": round(cer_improvement, 4),
|
| 210 |
+
"wer_improvement": round(wer_improvement, 4),
|
| 211 |
+
"verdict": verdict,
|
| 212 |
+
|
| 213 |
+
# ── Modernismos (HTR vs Corregido) ────────────────────────────
|
| 214 |
+
"modernism_score": modernism["score"],
|
| 215 |
+
"modernism": modernism,
|
| 216 |
+
|
| 217 |
+
# ── Regresiones ───────────────────────────────────────────────
|
| 218 |
+
"regression": regression,
|
| 219 |
}
|
| 220 |
|
| 221 |
+
# ── Reporte legible de un par ────────────────────────────────────────────
|
| 222 |
+
|
| 223 |
+
@staticmethod
|
| 224 |
+
def format_pair_report(metrics: Dict) -> str:
|
| 225 |
+
"""
|
| 226 |
+
Formatea las métricas de un par en texto legible para la UI.
|
| 227 |
+
"""
|
| 228 |
+
lines = []
|
| 229 |
+
lines.append("─" * 50)
|
| 230 |
+
lines.append("📊 EVALUACIÓN DE LA CORRECCIÓN")
|
| 231 |
+
lines.append("─" * 50)
|
| 232 |
+
|
| 233 |
+
# Comparación 1 — error de partida
|
| 234 |
+
lines.append("\n① Error de partida (GT vs HTR original)")
|
| 235 |
+
lines.append(f" CER: {metrics['cer_before']:.2%} WER: {metrics['wer_before']:.2%}")
|
| 236 |
+
|
| 237 |
+
# Comparación 2 — error final
|
| 238 |
+
lines.append("\n② Error final (GT vs Texto corregido)")
|
| 239 |
+
lines.append(f" CER: {metrics['cer_after']:.2%} WER: {metrics['wer_after']:.2%}")
|
| 240 |
+
|
| 241 |
+
# Mejora neta
|
| 242 |
+
cer_imp = metrics["cer_improvement"]
|
| 243 |
+
wer_imp = metrics["wer_improvement"]
|
| 244 |
+
sign_c = "+" if cer_imp >= 0 else ""
|
| 245 |
+
sign_w = "+" if wer_imp >= 0 else ""
|
| 246 |
+
lines.append(f"\n Mejora CER: {sign_c}{cer_imp:.2%} Mejora WER: {sign_w}{wer_imp:.2%}")
|
| 247 |
+
lines.append(f" {metrics['verdict']}")
|
| 248 |
+
|
| 249 |
+
# Comparación 3 — modernismos
|
| 250 |
+
mod = metrics["modernism"]
|
| 251 |
+
lines.append(f"\n③ Modernismos introducidos (HTR vs Corregido)")
|
| 252 |
+
if mod["count"] == 0:
|
| 253 |
+
lines.append(" ✓ Ninguno — el LLM respetó las grafías del s.XVI")
|
| 254 |
+
else:
|
| 255 |
+
lines.append(f" ✗ {mod['count']} modernismo(s) detectado(s):")
|
| 256 |
+
for issue in mod["issues"]:
|
| 257 |
+
lines.append(
|
| 258 |
+
f" • '{issue['modern']}' introducido "
|
| 259 |
+
f"(debería ser '{issue['ancient']}'): {issue['rule']}"
|
| 260 |
+
)
|
| 261 |
+
|
| 262 |
+
# Regresiones
|
| 263 |
+
reg = metrics["regression"]
|
| 264 |
+
if reg["count"] > 0:
|
| 265 |
+
lines.append(f"\n⚠ Regresiones: {reg['count']} palabra(s) correctas en HTR empeoradas por el LLM:")
|
| 266 |
+
for r in reg["regressions"][:5]:
|
| 267 |
+
lines.append(
|
| 268 |
+
f" • posición {r['position']}: "
|
| 269 |
+
f"HTR='{r['htr']}' → Corregido='{r['corrected']}' "
|
| 270 |
+
f"(GT='{r['gt']}')"
|
| 271 |
+
)
|
| 272 |
+
|
| 273 |
+
lines.append("─" * 50)
|
| 274 |
+
return "\n".join(lines)
|
| 275 |
+
|
| 276 |
# ── Evaluación en batch ──────────────────────────────────────────────────
|
| 277 |
|
| 278 |
def batch_evaluate(
|
|
|
|
| 293 |
corrected=out["corrected"],
|
| 294 |
gt=pair["gt"],
|
| 295 |
)
|
| 296 |
+
metrics["id"] = pair["id"]
|
| 297 |
+
metrics["htr"] = pair["htr"]
|
| 298 |
metrics["corrected"] = out["corrected"]
|
| 299 |
+
metrics["gt"] = pair["gt"]
|
| 300 |
results.append(metrics)
|
| 301 |
except Exception as e:
|
| 302 |
print(f" ❌ Error en {pair['id']}: {e}")
|
|
|
|
| 304 |
if not results:
|
| 305 |
return {"error": "Sin resultados"}
|
| 306 |
|
| 307 |
+
def avg(key):
|
| 308 |
+
return round(sum(r[key] for r in results) / len(results), 4)
|
| 309 |
+
|
| 310 |
+
n = len(results)
|
| 311 |
+
mejoras = sum(1 for r in results if r["cer_improvement"] > 0.02)
|
| 312 |
+
empeorados = sum(1 for r in results if r["cer_improvement"] < -0.02)
|
| 313 |
+
sin_cambio = n - mejoras - empeorados
|
| 314 |
|
| 315 |
summary = {
|
| 316 |
+
"n_evaluated": n,
|
| 317 |
+
|
| 318 |
+
# ── Comparación 1: GT vs HTR ──────────────────────────────────
|
| 319 |
+
"avg_cer_before": avg("cer_before"),
|
| 320 |
+
"avg_wer_before": avg("wer_before"),
|
| 321 |
+
|
| 322 |
+
# ── Comparación 2: GT vs Corregido ────────────────────────────
|
| 323 |
+
"avg_cer_after": avg("cer_after"),
|
| 324 |
+
"avg_wer_after": avg("wer_after"),
|
| 325 |
+
|
| 326 |
+
# ── Mejora neta ───────────────────────────────────────────────
|
| 327 |
+
"avg_cer_improvement": avg("cer_improvement"),
|
| 328 |
+
"avg_wer_improvement": avg("wer_improvement"),
|
| 329 |
+
"n_mejorados": mejoras,
|
| 330 |
+
"n_empeorados": empeorados,
|
| 331 |
+
"n_sin_cambio": sin_cambio,
|
| 332 |
+
|
| 333 |
+
# ── Comparación 3: Modernismos ────────────────────────────────
|
| 334 |
+
"avg_modernism_score": avg("modernism_score"),
|
| 335 |
+
|
| 336 |
+
"detail": results,
|
| 337 |
}
|
| 338 |
|
| 339 |
if verbose:
|
| 340 |
+
print(f"\n{'─'*55}")
|
| 341 |
+
print(f"📊 RESUMEN EVALUACIÓN ({n} pares)")
|
| 342 |
+
print(f"{'─'*55}")
|
| 343 |
+
print(f"\n① Error de partida (GT vs HTR):")
|
| 344 |
+
print(f" CER: {summary['avg_cer_before']:.2%} WER: {summary['avg_wer_before']:.2%}")
|
| 345 |
+
print(f"\n② Error final (GT vs Corregido):")
|
| 346 |
+
print(f" CER: {summary['avg_cer_after']:.2%} WER: {summary['avg_wer_after']:.2%}")
|
| 347 |
+
print(f"\n Mejora CER: {summary['avg_cer_improvement']:+.2%} "
|
| 348 |
+
f"Mejora WER: {summary['avg_wer_improvement']:+.2%}")
|
| 349 |
+
print(f"\n Mejorados : {mejoras}/{n} ({mejoras/n:.0%})")
|
| 350 |
+
print(f" Empeorados : {empeorados}/{n} ({empeorados/n:.0%})")
|
| 351 |
+
print(f" Sin cambio : {sin_cambio}/{n} ({sin_cambio/n:.0%})")
|
| 352 |
+
print(f"\n③ Modernismos (HTR vs Corregido):")
|
| 353 |
+
print(f" Score promedio: {summary['avg_modernism_score']:.2%} "
|
| 354 |
+
f"(1.0 = sin modernismos)")
|
| 355 |
+
print(f"{'─'*55}")
|
| 356 |
|
| 357 |
return summary
|