Merge branch 'ci/sync_gh_tflite-micro' into 'master'

Sync esp-tflite-micro from github - 1097358

See merge request app-frameworks/esp-tflite-micro!178

Author: vikramdattu

tensorflow/lite/micro/kernels/prelu.cc

@@ -61,8 +61,18 @@ TfLiteStatus PreluEval(TfLiteContext* context, TfLiteNode* node) {
           tflite::micro::GetTensorData<int8_t>(output));
       return kTfLiteOk;
     } break;
+    case kTfLiteInt16: {
+      reference_ops::BroadcastPrelu4DSlow(
+          params, tflite::micro::GetTensorShape(input),
+          tflite::micro::GetTensorData<int16_t>(input),
+          tflite::micro::GetTensorShape(alpha),
+          tflite::micro::GetTensorData<int8_t>(alpha),
+          tflite::micro::GetTensorShape(output),
+          tflite::micro::GetTensorData<int16_t>(output));
+      return kTfLiteOk;
+    } break;
     default:
-      MicroPrintf("Only float32 and uint8_t are supported currently, got %d.",
+      MicroPrintf("Input type '%s' is not supported.",
                   TfLiteTypeGetName(input->type));
       return kTfLiteError;
   }

tensorflow/lite/micro/kernels/prelu_common.cc

@@ -96,6 +96,11 @@ TfLiteStatus PreluPrepare(TfLiteContext* context, TfLiteNode* node) {
   TF_LITE_ENSURE_OK(context,
                     CalculatePreluParams(input, alpha, output, params));
 
+  if (output->type == kTfLiteInt16) {
+    // Make sure alpha type is Int8 when Output is Int16
+    TF_LITE_ENSURE(context, alpha->type == kTfLiteInt8);
+  }
+
   micro_context->DeallocateTempTfLiteTensor(input);
   micro_context->DeallocateTempTfLiteTensor(alpha);
   micro_context->DeallocateTempTfLiteTensor(output);