Add support for joining data with default precision.

PiperOrigin-RevId: 230376960

tensorflow/lite/testing/join.h

@@ -24,7 +24,21 @@ limitations under the License.
 namespace tflite {
 namespace testing {
 
-// Join a list of data separated by delimiter.
+// Join a list of data with default precision separated by delimiter.
+template <typename T>
+string JoinDefault(T* data, size_t len, const string& delimiter) {
+  if (len == 0 || data == nullptr) {
+    return "";
+  }
+  std::stringstream result;
+  result << data[0];
+  for (int i = 1; i < len; i++) {
+    result << delimiter << data[i];
+  }
+  return result.str();
+}
+
+// Join a list of data with fixed precision separated by delimiter.
 template <typename T>
 string Join(T* data, size_t len, const string& delimiter) {
   if (len == 0 || data == nullptr) {

tensorflow/lite/testing/join_test.cc

@@ -26,6 +26,11 @@ TEST(JoinTest, JoinInt) {
   EXPECT_EQ(Join(data.data(), data.size(), ","), "1,2,3");
 }
 
+TEST(JoinDefaultTest, JoinFloat) {
+  float data[] = {1.0, -3, 2.3, 1e-5};
+  EXPECT_EQ(JoinDefault(data, 4, " "), "1 -3 2.3 1e-05");
+}
+
 TEST(JoinTest, JoinFloat) {
   float data[] = {1.0, -3, 2.3, 1e-5};
   EXPECT_EQ(Join(data, 4, " "), "1 -3 2.29999995 9.99999975e-06");