Add printer for vector of tenssors

LiteRT-PiperOrigin-RevId: 774969098

Author: LukeBoyer

litert/core/model/BUILD

@@ -64,6 +64,7 @@ cc_test(
     deps = [
         ":buffer_manager",
         ":model",
+        "//litert/c:litert_common",
         "//litert/c:litert_op_code",
         "//litert/cc:litert_buffer_ref",
         "//litert/core:build_stamp",

litert/core/model/model.h

@@ -1083,6 +1083,17 @@ void AbslStringify(Sink& sink, const LiteRtTensorT& tensor) {
   absl::Format(&sink, "%v%s", tensor.Type(), weights_str);
 }
 
+template <class Sink>
+void AbslStringify(Sink& sink, const std::vector<LiteRtTensor>& tensors) {
+  sink.Append("(");
+  for (auto it = tensors.begin(); it < tensors.end() - 1; ++it) {
+    sink.Append(absl::StrFormat("%v", **it));
+    sink.Append(",");
+  }
+  sink.Append(absl::StrFormat("%v", *tensors.back()));
+  sink.Append(")");
+}
+
 // OPTIONS PRINTING
 
 namespace litert::internal {

litert/core/model/model_test.cc

@@ -26,6 +26,7 @@
 #include "absl/strings/str_format.h"  // from @com_google_absl
 #include "absl/strings/string_view.h"  // from @com_google_absl
 #include "absl/types/span.h"  // from @com_google_absl
+#include "litert/c/litert_common.h"
 #include "litert/c/litert_model.h"
 #include "litert/c/litert_op_code.h"
 #include "litert/cc/litert_buffer_ref.h"
@@ -568,6 +569,17 @@ TEST(PrintingTest, ConstTensor) {
   EXPECT_EQ(absl::StrFormat("%v", tensor), "3d_i32<2x2x2>_cst[8B]");
 }
 
+TEST(PrintingTest, TensoVector) {
+  LiteRtTensorT tensor;
+  tensor.SetType(MakeRankedTensorType(kLiteRtElementTypeInt32, {2, 2, 2}));
+
+  LiteRtTensorT tensor2;
+  tensor2.SetType(MakeRankedTensorType(kLiteRtElementTypeInt32, {2, 2, 2}));
+
+  std::vector<LiteRtTensor> tensors = {&tensor, &tensor2};
+  EXPECT_EQ(absl::StrFormat("%v", tensors), "(3d_i32<2x2x2>,3d_i32<2x2x2>)");
+}
+
 TEST(PrintingTest, TflOptions) {
   TflOptions opts;
   opts.type = ::tflite::BuiltinOptions_AddOptions;