From b98a07bd382203e76b0e5c67108bfdad023d35c8 Mon Sep 17 00:00:00 2001
From: Tao Li <litaotju@live.cn>
Date: Sat, 11 Jan 2020 14:02:40 +0800
Subject: [PATCH] Fix #17267, add expected and got datatype when non-uniform
 dtype fount in concat

---
 src/operator/nn/concat.cc | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/operator/nn/concat.cc b/src/operator/nn/concat.cc
index 1eeef7db5cb5..663bbe1e933e 100644
--- a/src/operator/nn/concat.cc
+++ b/src/operator/nn/concat.cc
@@ -149,9 +149,10 @@ bool ConcatType(const nnvm::NodeAttrs& attrs,
     if (dtype == -1) {
       dtype = i;
     } else {
-      CHECK(i == dtype ||
-          i == -1) <<
-          "Non-uniform data type in Concat";
+      CHECK( i == dtype || i == -1) 
+          << "Non-uniform data type in Concat: " 
+          << "expected data type " << mxnet::op::type_string(dtype) 
+          << ", got data type " << mxnet::op::type_string(i);
     }
   }