Add BLEU metric to Evidently #1486
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Fixes evidentlyai#1319 Add BLEU metric implementation to compute scores for each row and a summary BLEU metric for the dataset. * **New BLEU Metric Implementation** - Create `src/evidently/metrics/bleu_metric.py` to implement the BLEU metric. - Define BLEUMetricResult and BLEUMetric classes. - Implement BLEUMetricRenderer for HTML rendering of BLEU scores. * **Integration with Existing Code** - Update `src/evidently/metric_preset/text_evals.py` to include BLEU metric in the descriptors list. - Update `src/evidently/metrics/__init__.py` to import and reference the BLEU metric. * **Testing** - Add `tests/metrics/test_bleu_metric.py` to include tests for the BLEU metric.
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Fixes #1319
Add BLEU metric implementation to compute scores for each row and a summary BLEU metric for the dataset.
New BLEU Metric Implementation
src/evidently/metrics/bleu_metric.pyto implement the BLEU metric.Integration with Existing Code
src/evidently/metric_preset/text_evals.pyto include BLEU metric in the descriptors list.src/evidently/metrics/__init__.pyto import and reference the BLEU metric.Testing
tests/metrics/test_bleu_metric.pyto include tests for the BLEU metric.