Regression in v0.7.0

[terhorst]

Updating to diffrax v0.7.0 suddenly made our models crash with the error message:

ValueError: A fixed step size controller is being used alongside an implicit solver, but the tolerances for the implicit solver have not been specified. (Being unspecified is the default in Diffrax.)

The code that causes the crash indeed uses diffrax.PIDController so the error seems wrong. Here is the snippet that leads to the error:

solver = dfx.Kvaerno3()
ssc = dfx.PIDController(jump_ts=jump_ts, rtol=1e-6, atol=1e-6)
res = dfx.diffeqsolve(
    term,
    solver,
    t0=t0,
    t1=t1,
    dt0=(t1 - t0) / 1000,
    args=args,
    y0=y0,
    stepsize_controller=ssc,
    max_steps=16384,
    saveat=saveat,
)

Downgrading to v0.6.2 fixes the problem.

[patrick-kidger]

Thanks for the report! I've just opened #608 with a fix.

[patrick-kidger]

Closing as now fixed on main, and this will be in our next release.

Any similar issues feel free to reopen!

[terhorst]

Thanks for the quick fix!

[DanielePessina]

Hi Patrick,
I don't think the updated version is up on PyPi, so (at least for me) UV downloads the old 0.7.0 version

[johannahaffner]

There has not been a new release yet, but you can install the current version of main from Github with pip install git+https://github.com/patrick-kidger/diffrax in the meantime. Also works with uv pip install ... of course.