# tf_agents.trajectories.policy_step.CommonFields

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| [![](https://www.tensorflow.org/images/GitHub-Mark-32px.png) View source on GitHub](https://github.com/tensorflow/agents/blob/v0.19.0/tf_agents/trajectories/policy_step.py#L80-L87) |

Strings which can be used for querying returned PolicyStep.info field.

For example, use getattr(info, CommonFields.LOG_PROBABILITY, None) to check if
log probabilities are returned in the step or not.

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| ## Class Variables ||
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| LOG_PROBABILITY | `'log_probability'` |

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