# Mixture of Float32 and Float64
**URL:** https://discourse.julialang.org/t/mixture-of-float32-and-float64/95439
**Category:** General Usage
**Created:** [March 2, 2023, 12:17pm UTC](https://discourse.julialang.org/t/mixture-of-float32-and-float64/95439 "2023-03-02T12:17:52Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@erlebach](https://discourse.julialang.org/u/erlebach)
#### Post date: [March 2, 2023, 12:17pm UTC](https://discourse.julialang.org/t/mixture-of-float32-and-float64/95439/1 "2023-03-02T12:17:52Z")
If a computational graph is a mixture of Float32 and Float64, will Zygote have issues? Or must one be careful about types? Are there any stated rules, best practices, etc?
Clearly adding a Float32 and a Float64 should not be an issue. But what about many of the other operations and constructs? Thanks.
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### Author:  [@josuagrw](https://discourse.julialang.org/u/josuagrw)
#### Post date: [March 2, 2023, 12:26pm UTC](https://discourse.julialang.org/t/mixture-of-float32-and-float64/95439/2 "2023-03-02T12:26:19Z")
Generally, [type promotion](https://docs.julialang.org/en/v1/manual/conversion-and-promotion/#Promotion) will take care of those questions. Where types cannot be promoted, Julia will raise an [InexactError](http://web.mit.edu/julia_v0.6.0/julia/share/doc/julia/html/en/stdlib/base.html#Core.InexactError).