Fixed scratch size calculation for conv for HiFi targets for scenario…

…s when input, filter and output heights are 1. (tensorflow#3004)

Fixed scratch size calculation for conv for HiFi targets for scenarios when input, filter and output heights are 1.
BUG=conv_hifi_scratch_size

tensorflow/lite/micro/kernels/xtensa/conv_hifi.cc

@@ -77,28 +77,60 @@ TfLiteStatus ConvPrepareHifi(TfLiteContext* context, TfLiteNode* node) {
   }
 
   const int input_height = input_shape.Dims(1);
+  const int input_width = input_shape.Dims(2);
   const int input_depth = MatchingDim(input_shape, 3, filter_shape, 3);
   const int filter_height = filter_shape.Dims(1);
   const int filter_width = filter_shape.Dims(2);
   const int output_height = output_shape.Dims(1);
+  const int output_width = output_shape.Dims(2);
   const int output_channels = output_shape.Dims(3);
   const int stride_height = params->stride_height;
+  const int stride_width = params->stride_width;
   const int pad_height = data->reference_op_data.padding.height;
+  const int pad_width = data->reference_op_data.padding.width;
 
   int required_scratch = 0;
   // TODO(b/277112516): Dilation is currently not supported on HiFi 4 NN Library
   if ((params->dilation_width_factor == 1) &&
       (params->dilation_height_factor == 1)) {
     if (input->type == kTfLiteInt8) {
-      required_scratch = xa_nn_conv2d_std_getsize(
-          input_height, input_depth, filter_height, filter_width, stride_height,
-          pad_height, output_height, output_channels, PREC_ASYM8S);
+      if (input_height == 1 && filter_height == 1 && output_height == 1) {
+        int inp_h, filt_h, filt_w, str_h, pad_h, out_h;
+        inp_h = input_width;
+        filt_h = filter_width;
+        filt_w = filter_height;
+        str_h = stride_width;
+        pad_h = pad_width;
+        out_h = output_width;
+        required_scratch = xa_nn_conv2d_std_getsize(
+            inp_h, input_depth, filt_h, filt_w, str_h, pad_h, out_h,
+            output_channels, PREC_ASYM8S);
+      } else {
+        required_scratch = xa_nn_conv2d_std_getsize(
+            input_height, input_depth, filter_height, filter_width,
+            stride_height, pad_height, output_height, output_channels,
+            PREC_ASYM8S);
+      }
       TF_LITE_ENSURE(context, required_scratch > 0);
     }
     if (input->type == kTfLiteInt16) {
-      required_scratch = xa_nn_conv2d_std_getsize(
-          input_height, input_depth, filter_height, filter_width, stride_height,
-          pad_height, output_height, output_channels, PREC_SYM16S);
+      if (input_height == 1 && filter_height == 1 && output_height == 1) {
+        int inp_h, filt_h, filt_w, str_h, pad_h, out_h;
+        inp_h = input_width;
+        filt_h = filter_width;
+        filt_w = filter_height;
+        str_h = stride_width;
+        pad_h = pad_width;
+        out_h = output_width;
+        required_scratch = xa_nn_conv2d_std_getsize(
+            inp_h, input_depth, filt_h, filt_w, str_h, pad_h, out_h,
+            output_channels, PREC_SYM16S);
+      } else {
+        required_scratch = xa_nn_conv2d_std_getsize(
+            input_height, input_depth, filter_height, filter_width,
+            stride_height, pad_height, output_height, output_channels,
+            PREC_SYM16S);
+      }
       TF_LITE_ENSURE(context, required_scratch > 0);
     }
   }