A Doubt about the Source Code of MSCCL

I am currently studying the source code of MSCCL, I have some doubts about the count variable in this structure. What does it mean?

// TODO: compress this by a lot!
struct mscclTransfer {
  int16_t srcoffset;
  int16_t dstoffset;
  uint8_t srcbuffer; // follow MSCCL_THIS_INPUT/MSCCL_THIS_OUTPUT macros
  uint8_t dstbuffer; // follow MSCCL_THIS_INPUT/MSCCL_THIS_OUTPUT macros
  int16_t depencePointer; // index to the first dependence
  int16_t numDependences; // depencePointer+numDependences indicate the last dependence
  int8_t has_dependence;
  int16_t numReductions; // number of reductions with the same dst
  int16_t reductionPointer; // where the reduction starts
  uint8_t type;
  //--------------//
  uint8_t count; //
  //--------------//
};

Locate the mscclTransfer definition and search for every use of its count field. Trace those uses to determine the field's meaning, then document the explanation in the issue or an appropriate source comment; the work is done when its purpose is clear from the code or accompanying documentation.