$ cat /etc/lsb-release 
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=18.04
DISTRIB_CODENAME=bionic
DISTRIB_DESCRIPTION="Ubuntu 18.04.2 LTS"
$ conda --version
conda 4.6.14
$ python --version
Python 3.7.3
$ pip --version
pip 19.1 from /home/dlweber/miniconda3/envs/gis-dataprocessing/lib/python3.7/site-packages/pip (python 3.7)

$ pip freeze | grep modin
modin==0.5.0
$ pip freeze | grep pandas
pandas==0.24.2
$ pip freeze | grep numpy
numpy==1.16.3

# environment.yaml
channels:
  - conda-forge
  - defaults

dependencies:
  - python>=3.7
  - affine
  - configobj
  - dask
  - numpy
  - pandas
  - pyarrow
  - rasterio
  - s3fs
  - scikit-learn
  - scipy
  - shapely
  - xarray
  - pip
  - pip:
    - modin

  File "/home/joe/miniconda3/envs/project/lib/python3.7/site-packages/modin/backends/pandas/query_compiler.py", line 871, in _full_reduce
    mapped_parts = self.data.map_across_blocks(map_func)
  File "/home/joe/miniconda3/envs/project/lib/python3.7/site-packages/modin/engines/base/frame/partition_manager.py", line 209, in map_across_blocks
    preprocessed_map_func = self.preprocess_func(map_func)
  File "/home/joe/miniconda3/envs/project/lib/python3.7/site-packages/modin/engines/base/frame/partition_manager.py", line 100, in preprocess_func
    return self._partition_class.preprocess_func(map_func)
  File "/home/joe/miniconda3/envs/project/lib/python3.7/site-packages/modin/engines/ray/pandas_on_ray/frame/partition.py", line 108, in preprocess_func
    return ray.put(func)
  File "/home/joe/miniconda3/envs/project/lib/python3.7/site-packages/ray/worker.py", line 2216, in put
    worker.put_object(object_id, value)
  File "/home/joe/miniconda3/envs/project/lib/python3.7/site-packages/ray/worker.py", line 375, in put_object
    self.store_and_register(object_id, value)
  File "/home/joe/miniconda3/envs/project/lib/python3.7/site-packages/ray/worker.py", line 309, in store_and_register
    self.task_driver_id))
  File "/home/joe/miniconda3/envs/project/lib/python3.7/site-packages/ray/utils.py", line 475, in _wrapper
    return orig_attr(*args, **kwargs)
  File "pyarrow/_plasma.pyx", line 496, in pyarrow._plasma.PlasmaClient.put
  File "pyarrow/serialization.pxi", line 355, in pyarrow.lib.serialize
  File "pyarrow/serialization.pxi", line 150, in pyarrow.lib.SerializationContext._serialize_callback
  File "/home/joe/miniconda3/envs/project/lib/python3.7/site-packages/ray/cloudpickle/cloudpickle.py", line 952, in dumps
    cp.dump(obj)
  File "/home/joe/miniconda3/envs/project/lib/python3.7/site-packages/ray/cloudpickle/cloudpickle.py", line 271, in dump
    raise pickle.PicklingError(msg)
_pickle.PicklingError: Could not pickle object as excessively deep recursion required.