Created by: dyning

smooth L1，如果使用inside_weight和outside_weight，并行运行会卡死。测试程序如下：

import paddle
import paddle.fluid as fluid

import sys, os
import time
import numpy as np
import math
import random 

def reader_test():
    def reader():
        index = range(0, 10000)
        random.shuffle(index)
        for idx in index:
            image = np.random.rand(3, 224, 224)
            loc = np.random.rand(4)
            weight = np.random.rand(4)
            yield image, loc, weight     
    return reader 

def main():
    data = fluid.layers.data(name='data', shape=[3, 224, 224], dtype='float32')
    bbox_targets = fluid.layers.data(name='bbox_targets', shape=[4], dtype='float32')
    bbox_loss_weights = fluid.layers.data(name='bbox_loss_weights', shape=[4], dtype='float32')
    fea_fc = fluid.layers.fc(input=data, size=1024, act='relu') 
    fc_loc = fluid.layers.fc(input=fea_fc, size=4, act='relu') 
    #loss_loc = fluid.layers.smooth_l1(fc_loc, bbox_targets)
    loss_loc = fluid.layers.smooth_l1(fc_loc, bbox_targets, inside_weight=bbox_loss_weights, outside_weight=bbox_loss_weights)
    avg_loss = fluid.layers.mean(x=loss_loc)

    bd = [80000]
    lr = [0.001, 0.0001]
    optimizer = fluid.optimizer.Momentum(learning_rate=fluid.layers.piecewise_decay(boundaries=bd, values=lr), momentum=0.9,
        regularization=fluid.regularizer.L2Decay(1e-4))
    opts = optimizer.minimize(avg_loss)  
    place = fluid.CUDAPlace(0)
    exe = fluid.Executor(place)
    exe.run(fluid.default_startup_program())    
    
    train_reader = paddle.batch(reader_test(), batch_size=16)
    feeder = fluid.DataFeeder(place=place, feed_list=[data, bbox_targets, bbox_loss_weights])
    
    train_exe = fluid.ParallelExecutor(use_cuda=True, loss_name=avg_loss.name)

    for pass_id in range(0, 20):
        for batch_id, blobs in enumerate(train_reader()):
            print batch_id
            train_exe.run([avg_loss.name], feed=feeder.feed(blobs))
            #exe.run(fluid.default_main_program(), feed=feeder.feed(blobs), fetch_list=[])
    print "ok"  


if __name__ == '__main__':
    main()