!279 UI fix echarts tip issue

Merge pull request !279 from 潘慧/master_ph2

mindinsight/ui/src/views/train-manage/operator.vue

@@ -828,6 +828,7 @@ export default {
           formatter: (params) => {
             return `${params.marker} ${params.data.name} ${params.percent}%`;
           },
+          confine: true,
         };
         option.series = [
           {
@@ -856,6 +857,7 @@ export default {
         option.color = ['#6C92FA'];
         option.tooltip = {
           trigger: 'axis',
+          confine: true,
         };
         option.series = [
           {

mindinsight/ui/src/views/train-manage/step-trace.vue

@@ -289,6 +289,7 @@ export default {
                   series: timeInfo,
                   tooltip: {
                     trigger: 'axis',
+                    confine: true,
                   },
                 };
                 if (type === 'iteration_interval') {