shithub: libvpx

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ML_VAR_PARTITION: adjust model threshold

Make decisions more aggressively to improve encoding speed.

Coding gains(avg-psnr) after this change over baseline:
rtc       1.55% for speed 7;  2.89% for speed 8.
ytlivehr  2.20% for speed 6.

Change-Id: If6ac4a942a5b4708bcc6b0a49bd92fbc4d67c3f8

--- a/vp9/encoder/vp9_encodeframe.c

+++ b/vp9/encoder/vp9_encodeframe.c

@@ -4505,15 +4505,9 @@

                                       int mi_col) {

   VP9_COMMON *const cm = &cpi->common;

   const NN_CONFIG *nn_config = NULL;

-  float thresh_low = -0.2f;

-  float thresh_high = 0.0f;

   switch (bsize) {

-    case BLOCK_64X64:

-      nn_config = &vp9_var_part_nnconfig_64;

-      thresh_low = -0.3f;

-      thresh_high = -0.1f;

-      break;

+    case BLOCK_64X64: nn_config = &vp9_var_part_nnconfig_64; break;

     case BLOCK_32X32: nn_config = &vp9_var_part_nnconfig_32; break;

     case BLOCK_16X16: nn_config = &vp9_var_part_nnconfig_16; break;

     case BLOCK_8X8: break;

@@ -4525,6 +4519,7 @@

   vpx_clear_system_state();

   {

+    const float thresh = 0.0f;

     float features[FEATURES] = { 0.0f };

     const int dc_q = vp9_dc_quant(cm->base_qindex, 0, cm->bit_depth);

     int feature_idx = 0;

@@ -4565,8 +4560,8 @@

     assert(feature_idx == FEATURES);

     nn_predict(features, nn_config, score);

-    if (score[0] > thresh_high) return 3;

-    if (score[0] < thresh_low) return 0;

+    if (score[0] > thresh) return PARTITION_SPLIT;

+    if (score[0] < thresh) return PARTITION_NONE;

     return -1;

   }

 }

@@ -4644,8 +4639,8 @@

     if (partition_none_allowed && do_split) {

       const int ml_predicted_partition =

           ml_predict_var_paritioning(cpi, x, bsize, mi_row, mi_col);

-      if (ml_predicted_partition == 0) do_split = 0;

-      if (ml_predicted_partition == 3) partition_none_allowed = 0;

+      if (ml_predicted_partition == PARTITION_NONE) do_split = 0;

+      if (ml_predicted_partition == PARTITION_SPLIT) partition_none_allowed = 0;

     }

   }

 #endif  // CONFIG_ML_VAR_PARTITION