def mpi_weighted_mean()

in cm/logger.py [0:0]

• 22 lines of code
• 7 McCabe index (conditional complexity)

def mpi_weighted_mean(comm, local_name2valcount):
    """
    Copied from: https://github.com/openai/baselines/blob/ea25b9e8b234e6ee1bca43083f8f3cf974143998/baselines/common/mpi_util.py#L110
    Perform a weighted average over dicts that are each on a different node
    Input: local_name2valcount: dict mapping key -> (value, count)
    Returns: key -> mean
    """
    all_name2valcount = comm.gather(local_name2valcount)
    if comm.rank == 0:
        name2sum = defaultdict(float)
        name2count = defaultdict(float)
        for n2vc in all_name2valcount:
            for (name, (val, count)) in n2vc.items():
                try:
                    val = float(val)
                except ValueError:
                    if comm.rank == 0:
                        warnings.warn(
                            "WARNING: tried to compute mean on non-float {}={}".format(
                                name, val
                            )
                        )
                else:
                    name2sum[name] += val * count
                    name2count[name] += count
        return {name: name2sum[name] / name2count[name] for name in name2sum}
    else:
        return {}