Created by: pangyoki

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Describe

Support that value type of op assign_value can be float64. Because of Attr（defined in framework.proto） not supporting double , so we need to change double to float in AddAttr, and then cast float to double when doing the assign processing . This method will lead to float number precision loss.

// in framework.proto
message Attr {
    required string name = 1;
    required AttrType type = 2;
    optional int32 i = 3;
    optional float f = 4;
    optional string s = 5;
    repeated int32 ints = 6;
    repeated float floats = 7;
    repeated string strings = 8;
    optional bool b = 10;
    repeated bool bools = 11;
    optional int32 block_idx = 12;
    optional int64 l = 13;
    repeated int32 blocks_idx = 14;
    repeated int64 longs = 15;
  };