# Training same model over multiple DataSetIterators

**URL:** <https://community.konduit.ai/t/training-same-model-over-multiple-datasetiterators/1007>\
**Category:** DL4J\
**Created:** [November 23, 2020, 3:24pm UTC](https://community.konduit.ai/t/training-same-model-over-multiple-datasetiterators/1007 "2020-11-23T15:24:30Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![dltrumpet](https://avatars.discourse-cdn.com/v4/letter/d/439d5e/32.png) [@dltrumpet](https://community.konduit.ai/u/dltrumpet)\
**Post date:** [November 23, 2020, 3:24pm UTC](https://community.konduit.ai/t/training-same-model-over-multiple-datasetiterators/1007/1 "2020-11-23T15:24:30Z")

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Is it expected that a `ComputationGraph` be `.fit()` on a single `DataSetIterator`, or can I train a model by invoking `.fit()` over multiple `DataSetIterator`s on the same `ComputationGraph` instance ?

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**Author:** ![agibsonccc](https://yyz1.discourse-cdn.com/flex035/user_avatar/community.konduit.ai/agibsonccc/32/697_2.png) [@agibsonccc](https://community.konduit.ai/u/agibsonccc)\
**Post date:** [November 29, 2020, 6:42am UTC](https://community.konduit.ai/t/training-same-model-over-multiple-datasetiterators/1007/2 "2020-11-29T06:42:26Z")

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@dltrumpet sorry was catching up on questions and found this. You generally use a MultiDataSetIterator for that, not a single one. A MultidataSetIterator will be 1 DataSetIterator per input.

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**Author:** ![dltrumpet](https://avatars.discourse-cdn.com/v4/letter/d/439d5e/32.png) [@dltrumpet](https://community.konduit.ai/u/dltrumpet)\
**Post date:** [November 30, 2020, 11:09am UTC](https://community.konduit.ai/t/training-same-model-over-multiple-datasetiterators/1007/3 "2020-11-30T11:09:27Z")

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thank you. I guess what I’m really asking is can I invoke `.fit()` as many times as I want on the same `ComputationGraph` ?

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**Author:** ![agibsonccc](https://yyz1.discourse-cdn.com/flex035/user_avatar/community.konduit.ai/agibsonccc/32/697_2.png) [@agibsonccc](https://community.konduit.ai/u/agibsonccc)\
**Post date:** [November 30, 2020, 11:47am UTC](https://community.konduit.ai/t/training-same-model-over-multiple-datasetiterators/1007/4 "2020-11-30T11:47:32Z")

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@dltrumpet yes fit is basically 1 update call.