@java.lang.Override
  public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
    if (sourceCase_ == 1) {
      output.writeMessage(
          1, (com.google.cloud.vision.v1p4beta1.ImportProductSetsGcsSource) source_);
    }
    getUnknownFields().writeTo(output);
  }
<pre>
The Google Cloud Storage location for a csv file which preserves a list
of ImportProductSetRequests in each line.
</pre>

<code>.google.cloud.vision.v1p4beta1.ImportProductSetsGcsSource gcs_source = 1;</code>
java-vision/proto-google-cloud-vision-v1p4beta1/src/main/java/com/google/cloud/vision/v1p4beta1/ImportProductSetsInputConfig.java