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Thread: A weird order8(?) CM coder

  1. #1
    Administrator Shelwien's Avatar
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    A weird order8(?) CM coder

    http://ctxmodel.net/files/mix_test/mix_test_vB.rar

    This is not especially good in any sense, but is kinda unique still.
    Because imho its a first CM implementation with only direct access
    to all (masked) context statistics and with CM-like compression ratio.
    That is, there're no hashes or trees - only static tables where
    each element corresponds to a specific context.
    Context masks are pretty funny - check the .idx files in archive.

    [ mix_test 09h2x4a CM coder (87M stats memory) ]
    book1.rc: 222010
    enwik6.rc: 252742
    wcc386.rc: 269768

    [ mix_test 09h2x4b CM coder (310M stats memory) ]
    book1.rc: 218899
    enwik6.rc: 248272
    wcc386.rc: 267258

  2. #2
    Administrator Shelwien's Avatar
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    http://ctxmodel.net/files/mix_test/mix_test_vC.rar
    + 09h2x4a coder fully tuned (244M)
    + alphabet reordering test
    + delayed counter test

    Code:
    book1  enwik6 wcc386 bookstar enwik8   enwik9    
    209675 249679 290768  9903255 23561835 208226850 // 09h2x4a: bitfield context mixing
    206927 242855 304590 10815006 22757931 200820030 // 09i0: alphabet reordering
    208994 245859 288623  9760519 23338466 206267385 // 09i2a: delayed counters
    206269 239101 302402 10908714 22552419 199084429 // 09i2b CM coder : AR + DC
    208208 250792 278422  9098171 20608793 167852106 // BWTmix v1
    Somehow this doesn't scale very well, it seems.
    For example, 09h2x4a enwik8-9 results seem similar to that of m1, which only
    has two counters.

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