Errors installing package

[AparaV]

Hi! I am running into issues when installing the package in Python 3.11.

With pip

I am running

pip install causal_tree_learn

I get a ModuleNotFoundError: No module named 'Cython' even though I have successfully installed cython.

Building locally

I also tried to clone the repo and build it locally using

python setup.py build_ext --inplace

With this, I get a compilation error

Error compiling Cython file:
------------------------------------------------------------
...
    cdef int third_quartile
    cdef np.ndarray[np.float_t, ndim=2] yy
    cdef np.ndarray[np.float_t, ndim=2] tt
    cdef np.ndarray x

    cdef np.ndarray[np.long_t, ndim=1] treat_num
                       ^
------------------------------------------------------------

CTL/causal_tree/util_c.pyx:362:23: Invalid type.

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What do you think is going wrong? How do I successfully install and use the package?

Thanks!