From cbe5b347e54ce5181887743c62b06aabcd00b778 Mon Sep 17 00:00:00 2001
From: yh_cc <poemsmileyh@gmail.com>
Date: Wed, 28 Aug 2019 23:53:53 +0800
Subject: [PATCH] =?UTF-8?q?SpanFMetric=E5=A2=9E=E5=8A=A0=E5=AF=B9encoding?=
 =?UTF-8?q?=5Ftype=E5=92=8Ctag=5Fvocab=E7=9A=84=E6=A3=80=E6=9F=A5?=
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---
 fastNLP/core/metrics.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fastNLP/core/metrics.py b/fastNLP/core/metrics.py
index 28d88fbc..0dc601a3 100644
--- a/fastNLP/core/metrics.py
+++ b/fastNLP/core/metrics.py
@@ -505,7 +505,7 @@ def _check_tag_vocab_and_encoding_type(vocab:Vocabulary, encoding_type:str):
     for tag, idx in vocab:
         if idx in (vocab.unknown_idx, vocab.padding_idx):
             continue
-        tag = tag[:1]
+        tag = tag[:1].lower()
         tag_set.add(tag)
     tags = encoding_type
     for tag in tag_set: