public io.grpc.stub.StreamObserver<com.google.cloud.vertexai.api.StreamDirectPredictRequest>
        streamDirectPredict(
            io.grpc.stub.StreamObserver<com.google.cloud.vertexai.api.StreamDirectPredictResponse>
                responseObserver) {
      return io.grpc.stub.ClientCalls.asyncBidiStreamingCall(
          getChannel().newCall(getStreamDirectPredictMethod(), getCallOptions()), responseObserver);
    }
<pre>
Perform a streaming online prediction request to a gRPC model server for
Vertex first-party products and frameworks.
</pre>
java-vertexai/grpc-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/PredictionServiceGrpc.java