New class: op_version_registry, test=develop

[Shixiaowei02]

PR types

New features

PR changes

Others

Description

new class: op_version_registry

REGISTER_OP_VERSION(reshape)
    .AddCheckpoint(
        R"ROC(
      Upgrade reshape, modified one attribute [axis] and add a new attribute [size].
    )ROC",
        framework::compatible::OpVersionDesc()
            .ModifyAttr("axis",
                        "Increased from the original one method to two.", -1)
            .NewAttr("size",
                     "In order to represent a two-dimensional rectangle, the "
                     "parameter size is added.", 0))
    .AddCheckpoint(
        R"ROC(
      Add a new attribute [height]
    )ROC",
        framework::compatible::OpVersionDesc().NewAttr(
            "height",
            "In order to represent a two-dimensional rectangle, the "
            "parameter height is added.", 0));

核心接口：

• AddCheckpoint(string summary, OpVersionDesc desc) 此方法会触发 Op 的 version++
• OpVersionDesc ，用于注册本次升级对应的修改点
• NewAttr(name, default_value) 表示增加了一个 attribute，并需要指定其向前兼容的默认值
• ModifyAttr(name, default_value) 表示修改了 attribute 的行为，并需要指定其向前兼容的默认值

其他注册方法可以按需增加

全局的 op_capatible_info 会记录每个 Op 最新的版本号（version checkpoint 的次数），并通过 save_inference_model 存储到模型中。

其中记录的版本及描述，会帮助 Inference 和 Lite 来对应升级策略；也可以自动搜集作为 Release Notes 的来源。

设计文档见 Agroup：Op 版本监控及兼容性识别设计（#3366223）

Update

The new API AddInput and AddOutput in PR2664

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[Superjomn]

LGTM