dropout_schedule: Add set-dropout-proportion in nnet3 utils

Author: vimalmanohar

src/nnet3/nnet-utils.cc

@@ -688,6 +688,29 @@ void ReadEditConfig(std::istream &edit_config_is, Nnet *nnet) {
  if (outputs_remaining == 0)
  KALDI_ERR << "All outputs were removed.";
  nnet->RemoveSomeNodes(nodes_to_remove);
+ } else if (directive == "set-dropout-proportion") {
+ std::string name_pattern = "*";
+ // name_pattern defaults to '*' if none is given. This pattern
+ // matches names of components, not nodes.
+ config_line.GetValue("name", &name_pattern);
+ BaseFloat proportion = -1;
+ if (!config_line.GetValue("proportion", &proportion)) {
+ KALDI_ERR << "In edits-config, expected proportion to be set in line: "
+ << config_line.WholeLine();
+ }
+ UpdatableComponent *component = NULL;
+ int32 num_dropout_proportions_set = 0;
+ for (int32 c = 0; c < nnet->NumComponents(); c++) {
+ if (NameMatchesPattern(nnet->GetComponentName(c).c_str(),
+ name_pattern.c_str()) &&
+ (component =
+ dynamic_cast<DropoutComponent*>(nnet->GetComponent(c)))) {
+ component->SetDropoutProportion(proportion);
+ num_dropout_proportions_set++;
+ }
+ }
+ KALDI_LOG << "Set dropout proportions for "
+ << num_dropout_proportions_set << " nodes.";
  } else {
  KALDI_ERR << "Directive '" << directive << "' is not currently "
  "supported (reading edit-config).";

src/nnet3/nnet-utils.h

@@ -233,6 +233,9 @@ void FindOrphanNodes(const Nnet &nnet, std::vector<int32> *nodes);
  remove internal nodes directly; instead you should use the command
  'remove-orphans'.
 
+ set-dropout-proportion [name=<name-pattern>] proportion=<dropout-proportion>
+ Sets the dropout rates for any components of type DropoutComponent whose
+ names match the given <name-pattern> (e.g. lstm*). <name-pattern> defaults to "*".
  \endverbatim
 */
 void ReadEditConfig(std::istream &config_file, Nnet *nnet);

src/nnet3bin/nnet3-copy.cc

@@ -42,7 +42,7 @@ int main(int argc, char *argv[]) {
 
  bool binary_write = true;
  BaseFloat learning_rate = -1,
- dropout = 0.0;
+ dropout = -1;
  std::string nnet_config, edits_config, edits_str;
  BaseFloat scale = 1.0;
 
@@ -64,7 +64,10 @@ int main(int argc, char *argv[]) {
  "will be converted to newlines before parsing. E.g. "
  "'--edits=remove-orphans'.");
  po.Register("set-dropout-proportion", &dropout, "Set dropout proportion "
- "in all DropoutComponent to this value.");
+ "in all DropoutComponent to this value. "
+ "This option is deprecated. Use set-dropout-proportion "
+ "option in edits-config. See comments in ReadEditConfig() "
+ "in nnet3/nnet-utils.h."); 
  po.Register("scale", &scale, "The parameter matrices are scaled"
  " by the specified value.");
  po.Read(argc, argv);
@@ -92,7 +95,10 @@ int main(int argc, char *argv[]) {
  ScaleNnet(scale, &nnet);
 
  if (dropout > 0)
- SetDropoutProportion(dropout, &nnet);
+ KALDI_ERR << "--dropout option is deprecated. "
+ << "Use set-dropout-proportion "
+ << "option in edits-config. See comments in ReadEditConfig() "
+ << "in nnet3/nnet-utils.h."; 
 
  if (!edits_config.empty()) {
  Input ki(edits_config);