Optimizer doesn't work with a single parameter

[sakimarquis]

Here is the code snippet that reproduces the issue:

    def foo(x):
        return x[0]**2

    x0 = np.array([1])
    lower_bounds = np.array([-10])
    upper_bounds = np.array([10])
    plausible_lower_bounds = np.array([-5])
    plausible_upper_bounds = np.array([5])
    bads = BADS(foo, x0, lower_bounds, upper_bounds, plausible_lower_bounds, plausible_upper_bounds)

Traceback (most recent call last):
  File "D:\Miniconda3\lib\site-packages\IPython\core\interactiveshell.py", line 3505, in run_code
    exec(code_obj, self.user_global_ns, self.user_ns)
  File "<ipython-input-41-0b496bbed19e>", line 9, in <module>
    bads = BADS(foo, x0, lower_bounds, upper_bounds, plausible_lower_bounds, plausible_upper_bounds)
  File "D:\Miniconda3\lib\site-packages\pybads\bads\bads.py", line 245, in __init__
    self.optim_state = self._init_optim_state_()
  File "D:\Miniconda3\lib\site-packages\pybads\bads\bads.py", line 602, in _init_optim_state_
    self.var_transf = VariableTransformer(
  File "D:\Miniconda3\lib\site-packages\pybads\variable_transformer\variables_transformer.py", line 117, in __init__
    ) = self.__create_hypercube_trans__()
  File "D:\Miniconda3\lib\site-packages\pybads\variable_transformer\variables_transformer.py", line 164, in __create_hypercube_trans__
    and (self.pub[:, i] / self.plb[:, i] >= 10).item()
ValueError: can only convert an array of size 1 to a Python scalar

[lacerbi]

Thanks for posting this, we will look into it.

[GurjeetSinghSangra]

Hello,

Thank you a lot for posting this issue. I would like to share with you that we released a new patch version of PyBADS, v1.0.2. It includes the fix to the single parameter optimization. You can update your environment or reinstall the library by following pypi or conda instructions, e.g. pip install --upgrade pybads.