Support TDNN models from the yesno recipe from icefall (#262)

sherpa-onnx/csrc/offline-model-config.cc

@@ -15,6 +15,7 @@ void OfflineModelConfig::Register(ParseOptions *po) {
   paraformer.Register(po);
   nemo_ctc.Register(po);
   whisper.Register(po);
+  tdnn.Register(po);
 
   po->Register("tokens", &tokens, "Path to tokens.txt");
 
@@ -29,7 +30,8 @@ void OfflineModelConfig::Register(ParseOptions *po) {
 
   po->Register("model-type", &model_type,
                "Specify it to reduce model initialization time. "
-               "Valid values are: transducer, paraformer, nemo_ctc, whisper."
+               "Valid values are: transducer, paraformer, nemo_ctc, whisper, "
+               "tdnn."
                "All other values lead to loading the model twice.");
 }
 
@@ -56,6 +58,10 @@ bool OfflineModelConfig::Validate() const {
     return whisper.Validate();
   }
 
+  if (!tdnn.model.empty()) {
+    return tdnn.Validate();
+  }
+
   return transducer.Validate();
 }
 
@@ -67,6 +73,7 @@ std::string OfflineModelConfig::ToString() const {
   os << "paraformer=" << paraformer.ToString() << ", ";
   os << "nemo_ctc=" << nemo_ctc.ToString() << ", ";
   os << "whisper=" << whisper.ToString() << ", ";
+  os << "tdnn=" << tdnn.ToString() << ", ";
   os << "tokens=\"" << tokens << "\", ";
   os << "num_threads=" << num_threads << ", ";
   os << "debug=" << (debug ? "True" : "False") << ", ";