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local function groupby(func, seq)
    local t = {}
    for _, val in ipairs(seq) do
        local key = func(val)
        t[key] = t[key] or {}
        t[key][#t[key] + 1] = val
    end
    return t
end

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# Extend `dask.compute` to work on nested data structures.
from toolz import concat
from dask import compute

def _flatten_compute(vals):
    if isinstance(vals, list):
        inner = list(concat(map(_flatten_compute, vals)))
        return ['list', len(inner)] +  inner
    elif isinstance(vals, dict):
        inner = []

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Copyright (c) 2018 Erik Welch

All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

  a. Redistributions of source code must retain the above copyright notice,
     this list of conditions and the following disclaimer.
  b. Redistributions in binary form must reproduce the above copyright

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