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    GroundingSupport(mapping=None, *, ignore_unknown_fields=False, **kwargs)

Grounding support for a claim in `answer_text`.

.. _oneof: <https://proto-plus-python.readthedocs.io/en/stable/fields.html#oneofs-mutually-exclusive-fields>

| ## Attributes ||
|---|---|
| **Name** | **Description** |
| `start_index` | `int` Required. Index indicates the start of the claim, measured in bytes (UTF-8 unicode). |
| `end_index` | `int` Required. End of the claim, exclusive. |
| `grounding_score` | `float` A score in the range of \[0, 1\] describing how grounded is a specific claim by the references. Higher value means that the claim is better supported by the reference chunks. This field is a member of `oneof`_ `_grounding_score`. |
| `grounding_check_required` | `bool` Indicates that this claim required grounding check. When the system decided this claim didn't require attribution/grounding check, this field is set to false. In that case, no grounding check was done for the claim and therefore `grounding_score`, `sources` is not returned. This field is a member of `oneof`_ `_grounding_check_required`. |
| `sources` | `MutableSequence[https://docs.cloud.google.com/python/docs/reference/discoveryengine/latest/google.cloud.discoveryengine_v1beta.types.Answer.CitationSource]` Optional. Citation sources for the claim. |