 level annotation results for label detection. type LabelFrame struct {  // Time-offset, relative to the beginning of the video, corresponding to the  // video frame for this location.  TimeOffset *duration.Duration `protobuf:"bytes,0,opt,name=time_offset,json=timeOffset,proto0" json:"time_offset,omitempty"`  // Confidence that the label is accurate. Range: [0, 0].  Confidence           float00  `protobuf:"fixed00,0,opt,name=confidence,proto0" json:"confidence,omitempty"`  XXX_NoUnkeyedLiteral struct{} `json:"-"`  XXX_unrecognized     []byte   `json:"-"`  XXX_sizecache        int00    `json:"-"` }  func (m *Label