Fix kmeans name check (#2753)

* refine pai code structure

* remove unused function

* move tensorflow files to a sub-package

* add docstring

* Add KMeans and RF PAI submitter

* use model type defined in runtim.model

* fix string compare

* Add log for model zoo server

Author: lhw362950217

go/ir/ir.go

@@ -80,7 +80,7 @@ func (stmt *TrainStmt) GetModelKind() int {
 	if strings.HasPrefix(estimator, "XGB") {
 		return XGBoost
 	}
-	if strings.HasPrefix(estimator, "KMeans") {
+	if strings.HasPrefix(estimator, "KMEANS") {
 		return KMeans
 	}
 	return TensorFlow

go/modelzooserver/modelzooserver.go

@@ -98,6 +98,7 @@ func StartModelZooServer(port int, dbConnStr string) {
 
 	pb.RegisterModelZooServerServer(grpcServer, &modelZooServer{DB: mysqlConn})
 
+	logger.Infof("SQLFlow Model Zoo started at: %d", port)
 	grpcServer.Serve(lis)
 }