public static com.google.cloud.visionai.v1.ListCorporaRequest parseFrom(
      com.google.protobuf.CodedInputStream input) throws java.io.IOException {
    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
  }
<pre>
The filter applied to the returned corpora list.
Only the following restrictions are supported:
`type=&lt;Corpus.Type&gt;`,
`type!=&lt;Corpus.Type&gt;`.
</pre>

<code>string filter = 5;</code>

@return The bytes for filter.
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/ListCorporaRequest.java