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HParam summaries created by `tensorboard.plugins.hparams.summary` module will include `SummaryMetadata` whose `plugin_data` field has as `content` a serialized HParamsPluginData message.
The version of the plugin data schema.
Used in:
A map describing the hyperparameter values for the session. Maps each hyperparameter name to its value. Currently only scalars are supported.
The name of the session group containing this session. If empty, the group name is taken to be the session id (so this session is the only member of its group).
The time the session started in seconds since epoch.