From 65c77452c28d111f3766cf53cb30365b8e17d9a8 Mon Sep 17 00:00:00 2001
From: Admin <admin@viaeon.com>
Date: Fri, 17 Jul 2026 12:26:31 +0000
Subject: [PATCH] debug: show raw indices and fix boundary check

---
 internal/captcha/handler.go | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/internal/captcha/handler.go b/internal/captcha/handler.go
index 134a7f8..f68bbc5 100644
--- a/internal/captcha/handler.go
+++ b/internal/captcha/handler.go
@@ -439,17 +439,22 @@ func decodeMathFromOutput(output []float32) string {
 		allChars[t] = maxIdx
 	}
 
-	// 打印所有位置的识别结果
+	// 打印所有位置的识别结果（包括索引值）
 	debugStr := "DEBUG argmax: "
 	for _, idx := range allChars {
 		if idx > 0 && idx <= len(CHARS) {
-			debugStr += string(CHARS[idx-1])
-		} else {
+			debugStr += fmt.Sprintf("%c", CHARS[idx-1])
+		} else if idx == 0 {
 			debugStr += "_"
+		} else {
+			debugStr += fmt.Sprintf("[%d]", idx)  // 显示越界索引
 		}
 	}
 	fmt.Println(debugStr)
 
+	// 打印原始索引值
+	fmt.Printf("DEBUG raw indices: %v\n", allChars[:20])
+
 	// CTC 解码: 跳过 blank (index 0) 和连续重复
 	result := ""
 	lastIdx := -1