Python pathos错误无法腌制SwigPyObject对象

Question

我正在尝试使用 pathos 框架并行化python计算工作流程。计算工作流程本身很复杂，使用了许多模块，如GDAL，rasterIO，numpy等。

当我尝试使用pathos map 执行计算工作流程时，出现以下错误：

  

TypeError：无法腌制SwigPyObject对象

以下是我为重现错误而制作的简化代码：

Launcher.py

from cpp import *
import pathos.pools as pp

print "#####Lancement de la routine de mise à jour d'Irrisat#####"
today= datetime.datetime.now().date().strftime("%d%m")
currentYear= datetime.datetime.now().date().strftime("%Y")

pfolders= ['Data\\param1',\
           'Data\\param2']
p = pp.ProcessPool(4)
cpp= ParametersCalculator(('localhost', 'db', "postgres", "pass"))
#cpp.run(pfolders)
p.map(cpp.run, pfolders)

cpp.py

import numpy as np
import sys ,os, datetime, json, psycopg2, math, StringIO
import rasterio, math, time
import rasterio.mask
from osgeo.gdalconst import *
from osgeo import gdal, osr, ogr
np.seterr(divide='warn', invalid='ignore')

class ParametersCalculator:
    def __init__(self, con_params):
        self.driver=gdal.GetDriverByName('GTIff')
        self.driver.Register()
        databaseServer = con_params[0]
        databaseName = con_params[1]
        databaseUser = con_params[2]
        databasePW = con_params[3]
        self.tags= {"param1":("in1",), "param2":("in1","in2")}

    def preProcessValidation (self, pfolder):
        tif_files= [x for x in os.listdir(pfolder) if (x.endswith(".tif") or x.endswith(".tiff"))]
        param_name= pfolder.split('\\')[-1]
        tif_tags=[(param_tag, os.path.join(pfolder, tif)) for param_tag in self.tags[param_name] for tif in tif_files if param_tag.lower() in tif.lower()]
        print 1

    def run(self, pfolders):
        #for pfolder in pfolders:
            #print pfolder
            #self.preProcessValidation(pfolder)
        self.preProcessValidation(pfolder)