kz930 opened a new issue, #7945:
URL: https://github.com/apache/texera/issues/7945
### What happened?
`SklearnAdvancedSVCParameters` and `SklearnAdvancedSVRParameters` pair each
hyperparameter with the Python callable that converts the user's text. `gamma`
names `float`, so the operator emits `gamma = float(value)`.
scikit-learn accepts two different kinds of value for this parameter: one of
the words `scale` and `auto`, or a non-negative number. `scale` is the default,
and it is what makes the estimator derive gamma from the training data rather
than having it pinned to a constant. Under `float` neither word survives:
```
float('scale') -> ValueError: could not convert string to float: 'scale'
```
So the parameter can only ever be given an explicit number, and the mode
most users want is unreachable.
Naming `str` instead does not fix it, it only moves the loss to the other
half. `str` turns `0.1` into the string `'0.1'`, which scikit-learn then
refuses:
```
The 'gamma' parameter of SVC must be a str among {'auto', 'scale'} or a
float in the range [0.0, inf). Got '0.1' instead.
```
The difficulty is that `ParamClass` gives each hyperparameter exactly one
converter, and this one needs to carry both a word and a number. A converter
that tries `float` and falls back to the text would cover it, as would letting
a parameter declare more than one.
Related but not the same: #7593 covers two KNN parameters whose declared
converter is simply the wrong one, and a single word fixes each. This one
cannot be fixed by choosing a different converter, because no single converter
covers both kinds of value.
### How to reproduce?
Add an SVM Classifier Trainer, wire a numeric table to its training port and
any table to its parameter port, then set the ground truth attribute and the
selected features. Add one hyperparameter row, pick `gamma`, and give it
`scale`. The run ends. `auto` behaves the same. A number such as `0.1` runs
fine, which is the only way the parameter can be used today. The SVM Regressor
Trainer behaves identically.
### Version/Branch
1.3.0-incubating-SNAPSHOT (main)
### Relevant log output
```shell
ValueError: could not convert string to float: 'scale'
```
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