Comments (3)
Hi @samimia-swks,
cloudpickle
is indeed mentioned in the docs, albeit in a pretty light way 🙃
lambdas cannot easily be pickled for saving and restoring state (though see cloudpickle for an alternative to pickle that does support lambdas)
Unfortunately it seems that Param doesn't support it out of the box, even for very simple cases like the one you tried above. It'd be nice to add support for cloudpickle
(and fix the original support for pickle
if it's been broken in some ways), contributions in the area of serializing/deserializing Param objects are welcomed :) !
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Hi @maximlt,
I was able to figure out that cloudpickle (or dill) support was broken by #386 which is between version 1.9.3 and 1.10.0.
If I remove the offending lines of code, which are the definition setstate() method for the Parameters class, I can get cloudpickle to pickle a Parametrized class with both lambdas and @param.depends() decorators even on the latest 1.13.0 version :
def __setstate__(self, state):
# Set old parameters state on Parameterized._parameters_state
self_or_cls = state.get('self', state.get('cls'))
for k in self_or_cls._parameters_state:
key = '_'+k
if key in state:
self_or_cls._parameters_state[k] = state.pop(key)
for k, v in state.items():
setattr(self, k, v)
From what I understand, this is a method that's called by pickle
after unpickeling. However, I can't tell what it is doing because things still seem to work without it. My knowledge of python and this project is not nearly good enough to figure this out in the short terrm :)
Perhaps @philippjfr, who authored this code can clarify.
from param.
Thanks @samimia-swks I'm sure that's going to be very helpful!
from param.
Related Issues (20)
- Default range of param.Range fails to update using self.param.<parameter>.default assignment HOT 4
- Ability to apply @param.depends to all (nested) Parameters of a class HOT 1
- Param with bounds should default to lower bound HOT 7
- Add .is_active parameter to reactive expressions HOT 3
- Let reactive expressions .watch method support async functions
- Context manager .param.update should restore references
- Let pn.Param accept a list of objects HOT 1
- Warn on errors thru rx updates
- Make param.depends efficient HOT 6
- Parameter called outputs does not work with `.rx` HOT 4
- Triggering a function in one instance based on parameter changes in another HOT 2
- Initialization changes constant attribute. HOT 3
- Missing `param_help.png` in `User Guide/Parameters`
- Discussion about the intro video HOT 1
- Should methods on Parameterizeds be treated as references by default HOT 3
- `name` of a Parameterized instance overridden when is the default of a `readonly/constant` Parameter HOT 2
- Error on printing rx
- RX: output not updated when indexing a DataFrame with value_start/value_end HOT 1
- Small text issue in doc Getting Started
- Ability to specify multiple classes in class_ for ClassSelector parameter type needs to be documented
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