Remove a wrong check.

PiperOrigin-RevId: 251688407

tensorflow/lite/model.cc

@@ -327,7 +327,7 @@ TfLiteStatus InterpreterBuilder::ParseNodes(
 
 TfLiteStatus InterpreterBuilder::ParseQuantization(
     const QuantizationParameters* src_quantization,
-    TfLiteQuantization* quantization) {
+    TfLiteQuantization* quantization, const std::vector<int>& dims) {
   quantization->type = kTfLiteNoQuantization;
   if (!src_quantization || !src_quantization->scale() ||
       src_quantization->scale()->size() == 0) {
@@ -353,14 +353,29 @@ TfLiteStatus InterpreterBuilder::ParseQuantization(
   // Affine-quantization.
   quantization->type = kTfLiteAffineQuantization;
   const size_t num_scales = src_quantization->scale()->size();
+
+  // Ensure that the quantization dimension is valid.
   if (src_quantization->quantized_dimension() < 0 ||
-      src_quantization->quantized_dimension() >= num_scales) {
+      (!dims.empty() &&
+       src_quantization->quantized_dimension() >= dims.size())) {
     error_reporter_->Report(
-        "quantized_dimension must be in range [0, %d). Was %d.", num_scales,
+        "quantized_dimension must be in range [0, %d). Was %d.", dims.size(),
         src_quantization->quantized_dimension());
     return kTfLiteError;
   }
 
+  // Ensure that the number of scales is 1 for per-layer quantization, and
+  // matches number of quantization dimensions for per-axis quantization.
+  if (num_scales != 1 &&
+      (!dims.empty() &&
+       num_scales != dims[src_quantization->quantized_dimension()])) {
+    error_reporter_->Report(
+        "num_scales must be 1 for per-layer quantization, or %d for per-axis "
+        "quantization, but got %d.",
+        dims[src_quantization->quantized_dimension()], num_scales);
+    return kTfLiteError;
+  }
+
   auto* affine_quantization = reinterpret_cast<TfLiteAffineQuantization*>(
       malloc(sizeof(TfLiteAffineQuantization)));
   affine_quantization->scale = TfLiteFloatArrayCreate(num_scales);
@@ -429,7 +444,7 @@ TfLiteStatus InterpreterBuilder::ParseTensors(
 
     const auto* src_quantization = tensor->quantization();
     TfLiteQuantization quantization;
-    if (ParseQuantization(src_quantization, &quantization) != kTfLiteOk) {
+    if (ParseQuantization(src_quantization, &quantization, dims) != kTfLiteOk) {
       status = kTfLiteError;
       continue;
     }

tensorflow/lite/model.h

@@ -210,7 +210,8 @@ class InterpreterBuilder {
       Subgraph* subgraph);
   TfLiteStatus ApplyDelegates(Interpreter* interpreter);
   TfLiteStatus ParseQuantization(const QuantizationParameters* src_quantization,
-                                 TfLiteQuantization* quantization);
+                                 TfLiteQuantization* quantization,
+                                 const std::vector<int>& dims);
 
   const ::tflite::Model* model_;
   const OpResolver& op_resolver_;

tensorflow/lite/tools/optimize/quantization_utils.cc

@@ -322,8 +322,7 @@ TfLiteStatus SymmetricPerLayerBiasQuantize(ModelT* model, TensorT* tensor,
 TfLiteStatus SymmetricPerChannelBiasQuantize(ModelT* model, TensorT* tensor,
                                              float input_scale,
                                              const float* weight_scales,
-                                             int number_of_dimension,
-                                             int dimension_index) {
+                                             int number_of_dimension) {
   // Compute scales.
   std::vector<float> scales(number_of_dimension);
   for (size_t i = 0; i < number_of_dimension; i++) {
@@ -352,9 +351,8 @@ TfLiteStatus SymmetricPerChannelBiasQuantize(ModelT* model, TensorT* tensor,
   uint8_t* uint8_buffer = reinterpret_cast<uint8_t*>(final_buffer.data());
   size_t buffer_size = num_elements * sizeof(int32_t);
   std::vector<int64_t> zero_point(scales.size(), 0);
-  return AddQuantizationParams(scales, zero_point, dimension_index,
-                               uint8_buffer, buffer_size, TensorType_INT32,
-                               model, tensor);
+  return AddQuantizationParams(scales, zero_point, 0, uint8_buffer, buffer_size,
+                               TensorType_INT32, model, tensor);
 }
 
 TfLiteStatus QuantizeWeight(ModelT* model, TensorT* tensor, bool per_channel,

tensorflow/lite/tools/optimize/quantization_utils.h

@@ -89,8 +89,7 @@ TfLiteStatus SymmetricPerLayerBiasQuantize(ModelT* model, TensorT* tensor,
 TfLiteStatus SymmetricPerChannelBiasQuantize(ModelT* model, TensorT* tensor,
                                              float input_scale,
                                              const float* weight_scales,
-                                             int number_of_dimension,
-                                             int dimension_index);
+                                             int number_of_dimension);
 
 // Quantize weight with or without per channel.
 TfLiteStatus QuantizeWeight(ModelT* model, TensorT* tensor, bool per_channel,

tensorflow/lite/tools/optimize/quantization_utils_test.cc

@@ -386,7 +386,7 @@ TEST(QuantizationUtilsTest, SymmetricPerChannelBiasQuantize) {
   // Call and verify.
   EXPECT_EQ(SymmetricPerChannelBiasQuantize(
                 model.get(), model->subgraphs[0]->tensors[0].get(), input_scale,
-                weight_scales.data(), 2, 0),
+                weight_scales.data(), 2),
             kTfLiteOk);
   EXPECT_THAT(model->buffers[model->subgraphs[0]->tensors[0]->buffer]->data,
               ElementsAreArray({16, 0, 0, 0, 2, 0, 0, 0}));

tensorflow/lite/tools/optimize/quantize_model.cc

@@ -69,7 +69,7 @@ TfLiteStatus QuantizeBias(ModelT* model, const TensorT* input_tensor,
     }
     return utils::SymmetricPerChannelBiasQuantize(
         model, bias_tensor, input_tensor->quantization->scale[0],
-        weight_scales.data(), channel_dim_size, channel_dim_index);
+        weight_scales.data(), channel_dim_size);
   } else {
     if (weight_scales.size() != 1) {
       error_reporter->Report(