# UserWarning after sampling

**URL:** <https://discourse.pymc.io/t/userwarning-after-sampling/118>\
**Category:** Questions\
**Created:** [June 24, 2017, 7:38pm UTC](https://discourse.pymc.io/t/userwarning-after-sampling/118 "2017-06-24T19:38:03Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![junpenglao](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.pymc.io/junpenglao/32/8_2.png) [@junpenglao](https://discourse.pymc.io/u/junpenglao)\
**Post date:** [June 25, 2017, 6:26pm UTC](https://discourse.pymc.io/t/userwarning-after-sampling/118/2 "2017-06-25T18:26:14Z")

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Both warnings are related to the property of Hamiltonian Monte Carlo sampler. You can have a look at @colcarroll’s recent talk for some information [Talk/Essay: “Hamiltonian Monte Carlo in PyMC3”](https://discourse.pymc.io/t/talk-essay-hamiltonian-monte-carlo-in-pymc3/99). In the reference part, you can find the most relevant papers on this issue.

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