import caffe

 import numpy as np

 caffe.set_mode_cpu()

 net = caffe.Net('myprototxt.prototxt', 'mycaffemodel.caffemodel', caffe.TEST)

 netNew = caffe.Net('myprototxt2.prototxt', 'mycaffemodel2.caffemodel', caffe.TEST)

 for k, v in net.params.items():

     #print (k, v[0].data.shape)

     #print np.size(net.params[k])

     for i in range(np.size(net.params[k])):

         netNew.params[k][i].data[:] = np.copy(net.params[k][i].data[:])

 params = {('layer_name_new','layer_name_old')}

 for k, v in params:

     for i in range(np.size(net.params[v])):

         netNew.params[k][i].data[:] = np.copy(net.params[v][i].data[:])

 netNew.save('mynewmodel.caffemodel')