code: def logsumexp(tensor, axis=0):
      max_tensor = cp.max(tensor, axis=axis, keepdims=True)
      return cp.squeeze(
          cp.log(
              cp.sum(
                  cp.exp(tensor - max_tensor), axis=axis, keepdims=True
              )
          )
          + max_tensor,
          axis=axis,
      )
  
file_path: tensorly/tensorly/backend/cupy_backend.py
imports: import warnings
  from .core import Backend, backend_types, backend_basic_math, backend_array
label_desc: Use image node_id 7 for calling the CupyBackend obj's underlying member method code with example usage: obj.logsumexp(tensor, axis) and returns: cp