Merged PR 27051: Add an option for completely resetting validation metrics

Added `--valid-reset-all` that works as `--valid-reset-stalled` but it also resets last best saved validation metrics, which is useful for when the validation sets change for continued training.

Added new regression test: https://github.com/marian-nmt/marian-regression-tests/pull/89

CHANGELOG.md

@@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fused inplace-dropout in FFN layer in Transformer
 - `--force-decode` option for marian-decoder
 - `--output-sampling` now works with ensembles (requires proper normalization via e.g `--weights 0.5 0.5`)
+- `--valid-reset-all` option
 
 ### Fixed
 - Make concat factors not break old vector implementation

VERSION

@@ -1 +1 @@
-v1.11.14
+v1.11.15

azure-pipelines.yml

@@ -595,7 +595,10 @@ stages:
 
     # The following packages are already installed on Azure-hosted runners: build-essential openssl libssl-dev
     # No need to install libprotobuf{17,10,9v5} on Ubuntu {20,18,16}.04 because it is installed together with libprotobuf-dev
-    - bash: sudo apt-get install -y libgoogle-perftools-dev libprotobuf-dev protobuf-compiler gcc-9 g++-9
+    # Installing libunwind-dev fixes a bug in 2204 (the libunwind-14 and libunwind-dev conflict)
+    - bash: |
+        sudo apt-get install -y libunwind-dev
+        sudo apt-get install -y libgoogle-perftools-dev libprotobuf-dev protobuf-compiler gcc-9 g++-9
       displayName: Install packages
 
     # https://software.intel.com/content/www/us/en/develop/articles/installing-intel-free-libs-and-python-apt-repo.html

src/common/config_parser.cpp

@@ -269,7 +269,7 @@ void ConfigParser::addOptionsModel(cli::CLIWrapper& cli) {
       "Pool encoder states instead of using cross attention (selects first encoder state, best used with special token)");
   cli.add<int>("--transformer-dim-ffn",
       "Size of position-wise feed-forward network (transformer)",
-      2048);  
+      2048);
   cli.add<int>("--transformer-decoder-dim-ffn",
       "Size of position-wise feed-forward network in decoder (transformer). Uses --transformer-dim-ffn if 0.",
       0);
@@ -591,7 +591,9 @@ void ConfigParser::addOptionsValidation(cli::CLIWrapper& cli) {
       "Multiple metrics can be specified",
       {"cross-entropy"});
   cli.add<bool>("--valid-reset-stalled",
-     "Reset all stalled validation metrics when the training is restarted");
+     "Reset stalled validation metrics when the training is restarted");
+  cli.add<bool>("--valid-reset-all",
+     "Reset all validation metrics when the training is restarted");
   cli.add<size_t>("--early-stopping",
      "Stop if the first validation metric does not improve for arg consecutive validation steps",
      10);

src/training/scheduler.h

@@ -494,12 +494,17 @@ public:
       state_->wordsDisp    = 0;
     }
 
-    if(options_->get<bool>("valid-reset-stalled")) {
+    if(options_->get<bool>("valid-reset-stalled") || options_->get<bool>("valid-reset-all")) {
       state_->stalled      = 0;
       state_->maxStalled   = 0;
       for(const auto& validator : validators_) {
-        if(state_->validators[validator->type()])
+        if(state_->validators[validator->type()]) {
+          // reset the number of stalled validations, e.g. when the validation set is the same
           state_->validators[validator->type()]["stalled"] = 0;
+          // reset last best results as well, e.g. when the validation set changes
+          if(options_->get<bool>("valid-reset-all"))
+            state_->validators[validator->type()]["last-best"] = validator->initScore();
+        }
       }
     }
 
@@ -512,10 +517,10 @@ public:
     if(mpi_->isMainProcess())
       if(filesystem::exists(nameYaml))
         yamlStr = io::InputFileStream(nameYaml).readToString();
-    
+
     if(mpi_)
       mpi_->bCast(yamlStr);
-    
+
     loadFromString(yamlStr);
   }