ai-agent-book 精选快照（<2MB 代码与文档，来自 github.com/bojieli/ai-agent-book）

tests/test_ch6_char_error_rate.py

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+import pytest
+import sys
+from pathlib import Path
+
+HERE = Path(__file__).resolve().parent.parent
+TTS_DIR = HERE / "chapter7" / "tts-quality-eval"
+if str(TTS_DIR) not in sys.path:
+    sys.path.insert(0, str(TTS_DIR))
+
+sys.modules.pop("config", None)
+
+import pipeline  # noqa: E402
+
+
+def test_char_error_rate_empty_reference_with_hypothesis():
+    res = pipeline.char_error_rate("!!!", "hello")
+    assert res.accuracy == 0.0
+    assert res.edits == 5
+    assert res.cer == 5.0
+    assert res.ref_len == 0
+
+    res_empty = pipeline.char_error_rate("", "abc")
+    assert res_empty.accuracy == 0.0
+    assert res_empty.edits == 3
+    assert res_empty.cer == 3.0
+    assert res_empty.ref_len == 0
+
+
+def test_char_error_rate_both_empty():
+    res = pipeline.char_error_rate("!!!", "???")
+    assert res.accuracy == 1.0
+    assert res.edits == 0
+    assert res.cer == 0.0
+    assert res.ref_len == 0
+
+    res_empty = pipeline.char_error_rate("", "")
+    assert res_empty.accuracy == 1.0
+    assert res_empty.edits == 0
+    assert res_empty.cer == 0.0
+    assert res_empty.ref_len == 0
+
+
+def test_char_error_rate_normal_and_partial_match():
+    res_exact = pipeline.char_error_rate("hello", "hello")
+    assert res_exact.accuracy == 1.0
+    assert res_exact.edits == 0
+    assert res_exact.cer == 0.0
+    assert res_exact.ref_len == 5
+
+    res_deleted = pipeline.char_error_rate("hello", "")
+    assert res_deleted.accuracy == 0.0
+    assert res_deleted.edits == 5
+    assert res_deleted.cer == 1.0
+    assert res_deleted.ref_len == 5