From 8b55e9c73216f2a22da6e2940aaf956e2b94685c Mon Sep 17 00:00:00 2001
From: fis <jm.yuan@outlook.com>
Date: Tue, 23 Aug 2022 17:00:46 +0800
Subject: [PATCH] Empty dmatrix.

---
 src/objective/regression_obj.cu | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/objective/regression_obj.cu b/src/objective/regression_obj.cu
index de4c32304d5b..a19ab7a649fc 100644
--- a/src/objective/regression_obj.cu
+++ b/src/objective/regression_obj.cu
@@ -707,6 +707,11 @@ class MeanAbsoluteError : public ObjFunction {
     CheckInitInputs(info);
     base_margin->Reshape(1);
     auto h_base_margin = base_margin->HostView();
+    if (info.num_row_ == 0) {
+      h_base_margin(0) = DefaultBaseScore();
+      return;
+    }
+
     if (ctx_->IsCPU()) {
       h_base_margin(0) = common::Median(ctx_, info.labels.HostView(),
                                         common::OptionalWeights{info.weights_.ConstHostSpan()});