improve 5-tp algorithms

[zhoney]

Change-Id: Id77196f3ad40d2768a3498db7e19bca97fa11979

[codecov]

Codecov Report

Merging #936 into master will increase coverage by 2.91%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master     #936      +/-   ##
============================================
+ Coverage     69.13%   72.04%   +2.91%     
- Complexity     4503     4689     +186     
============================================
  Files           295      298       +3     
  Lines         22045    22463     +418     
  Branches       3121     3201      +80     
============================================
+ Hits          15240    16184     +944     
+ Misses         5308     4704     -604     
- Partials       1497     1575      +78     

Impacted Files	Coverage Δ	Complexity Δ
.../hugegraph/api/traversers/AllShortestPathsAPI.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...idu/hugegraph/api/traversers/SameNeighborsAPI.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...aidu/hugegraph/api/traversers/ShortestPathAPI.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...ph/api/traversers/SingleSourceShortestPathAPI.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...egraph/api/traversers/WeightedShortestPathAPI.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...com/baidu/hugegraph/serializer/JsonSerializer.java	49.36% <0.00%> (ø)	0.00 <0.00> (ø)
...ava/com/baidu/hugegraph/serializer/Serializer.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...va/com/baidu/hugegraph/backend/cache/RamCache.java	70.32% <0.00%> (-3.41%)	31.00% <0.00%> (-20.00%)
...gegraph/backend/serializer/BinaryBackendEntry.java	81.81% <0.00%> (-0.47%)	27.00% <0.00%> (-1.00%)
...java/com/baidu/hugegraph/type/define/DataType.java	86.30% <0.00%> (-0.37%)	40.00% <0.00%> (ø%)
... and 20 more

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