Fix LinAlgError

✅ Solution

LinAlgError generally arises from singular matrices or non-positive definite matrices when performing linear algebra operations like inverting a matrix or Cholesky decomposition. To resolve it, ensure your matrix is invertible (check its determinant is non-zero), or precondition it by adding a small multiple of the identity matrix to make it positive definite if appropriate; alternatively, use a more robust solver that handles singular cases like `numpy.linalg.lstsq`.