BUG IsotonicRegression errors with set_config(transform_output="pandas") #25763
Description
Describe the bug
IsotonicRegression.predict is broken by set_config(transform_output="pandas"). Mabye similar to #25365.
Steps/Code to Reproduce
import numpy as np
from sklearn.isotonic import IsotonicRegression
y = np.arange(4)
x = np.ones(4)
iso = IsotonicRegression().fit(x, y)
iso.predict([1]) # array([1.5])
iso = IsotonicRegression().set_output(transform="pandas").fit(x, y)
iso.predict([1])Expected Results
array([1.5])
Or at least no error!
Actual Results
TypeError: 'builtin_function_or_method' object is not iterable
Versions
1.2.1