public Builder setDataFormat(
          com.google.cloud.vertexai.api.Examples.ExampleGcsSource.DataFormat value) {
        if (value == null) {
          throw new NullPointerException();
        }
        bitField0_ |= 0x00000001;
        dataFormat_ = value.getNumber();
        onChanged();
        return this;
      }
<pre>
The format in which instances are given, if not specified, assume it's
JSONL format. Currently only JSONL format is supported.
</pre>

<code>.google.cloud.vertexai.v1.Examples.ExampleGcsSource.DataFormat data_format = 1;
</code>

@param value The dataFormat to set.
@return This builder for chaining.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/Examples.java