the script utils.py throws an error Getting an error if node.obj == lit: ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()

[amisra2]

Hi, I am using hyperopt to tune the parameters and I get this error if node.obj == lit: ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()

However, if I change this statement to if node.obj.all == lit: The code successfully runs. Are there any implications to this change? What could be the possible reason for this? Thanks, Amita

[roberto-trani]

I recently stumbled into this error. In my case, a parameter whose value is a numpy array caused the problem. Since node.obj contains the value associated with the parameter, the equivalence returns a new boolean numpy array containing the element-wise equality between node.obj and lit. I thus solved the issue changing the value of the parameter to list, as it implements the equal operator as we expect. I don't know the implications of the change that you suggest, but it seems that it does not do what it should do. If node.obj is a numpy array as in my case, node.obj.all checks if all elements are True or different from zero.. and compare the boolean result of this operation with lit.

My suggestion is to switch the numpy arrays (parameter values) to lists.