Using Concrete in a Jupyter Notebook

[Vanessa]

Hi, i’m an enthusiast of FHE and i’m new in Concrete.
I’m using Jupyter Notebook with a Rust kernel, and i’m trying to reproduce the code on the Concrete Documentation, but this following error message is appearing to me:

While processing instruction Ok("LOAD_AND_RUN /tmp/.tmpUMA6R7/target/debug/deps/libcode_21.so run_user_code_20"), got error: Message("/tmp/.tmpUMA6R7/target/debug/deps/libcode_21.so: undefined symbol: ZN13concrete_core4math6random14uniform_binary144$LT$impl$u20$concrete_core…math…random…RandomGenerable$LT$concrete_core…math…random…uniform_binary…UniformBinary$GT$$u20$for$u20$u64$GT$12generate_one17h902fc20b708f5eeaE")

Please can someone help me with this? Is there anything I can do to solve it?

[Agnes]

Hi @Vanessa! May I ask for a bit more details? Are you trying to use Concrete Numpy, or the Rust library directly? What part of our documentation are you referring to?

[Vanessa]

I’m trying to use the Rust library.
I’m using this documentation doc.
For example, the error message appears after I run this following part of code:

let secret_key = LWESecretKey::new(&LWE128_630);

[Vanessa]

I successfully imported some libraries.

[Agnes]

Oh, I’ve never tried to use concrete inside a notebook, but maybe you need to import concrete-core as well?

[Vanessa]

Still doesn’t work

[Vanessa]

It seems to me that there were internal modifications that are causing incompatibility.

[Vanessa]

I’m not seeing the method mentioned in the error message.

[Vanessa]

Another example of error.

[Agnes]

So how do you specify which version of concrete you use? By the way, concrete-core is really the low-level library: it requires an extensive knowledge of TFHE to build secure programs. The concrete crate is built on top of it and its aim is to provide the user with easier-to-use entry points. I don’t know what you intend to do with the notebook but probably for a start it’s better to use only instructions available via concrete. Still, it’s really strange that you have this version incompatibility: what are the concrete and concrete-core versions you’re using?

[Vanessa]

I think I’m going to cry here.

Even if I specify version 0.1.11 and only use concrete there is still an error message.

[Agnes]

Oh, now you have a dependency issue with the concrete-commons crate. May I ask you to try specifying these version numbers for the crates:

• concrete-core = “=0.1.10”
• concrete-npe = “=0.1.9”
• concrete-commons = “=0.1.1”

[Vanessa]

Still doesn’t work

[Agnes]

Hello @Vanessa! So, we have reproduced this behavior on our side too. However, we don’t know yet what is causing it: we’re opening an issue in the evcxr repository to ask them for advice here. I’ll keep you posted about a possible fix.

Best regards,
Agnès

[Vanessa]

Ok, I will be waiting.