Predictor类初始化参数新增gpu_mem: GPU显存大小

[angel-yi]

Predictor类初始化参数新增gpu_mem: GPU显存大小

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[jiangjiajun]

HI @angel-yi 函数参数新增时，从最后面开始追加，避免对已有调用此函数的代码带来影响

[angel-yi]

好的，谢谢，是我大意了

[jiangjiajun]

另外在默认值的选取上，为什么是设定的200呢

[angel-yi]

    if use_gpu:
        # 设置GPU初始显存(单位M)和Device ID
        config.enable_use_gpu(200, gpu_id)