I'm experimenting with the format described here: <a href="http://yann.lecun.com/exdb/

Edit: with debug output: <div class="snippet-clipboard-content notranslate positio

I can not reproduce it on both of latest master or devel (<a class="commit-link" data-

Broken on devel about nesm HOT 4 CLOSED

mratsim commented on June 2, 2024

Broken on devel

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Comments (4)

mratsim commented on June 2, 2024

Edit: with debug output:

$User/.nimble/pkgs/nesm-0.3.1/nesm.nim(186, 9) Hint: TypeDef
  Sym "MNIST_imgs"
  Empty
  ObjectTy
    Empty
    Empty
    RecList
      IdentDefs
        Postfix
          Ident ident"*"
          Ident ident"magic_number"
        Sym "int32"
        Empty
      IdentDefs
        Postfix
          Ident ident"*"
          Ident ident"n_imgs"
        Sym "int32"
        Empty
      IdentDefs
        Postfix
          Ident ident"*"
          Ident ident"n_rows"
        Sym "int32"
        Empty
      IdentDefs
        Postfix
          Ident ident"*"
          Ident ident"n_cols"
        Sym "int32"
        Empty
      IdentDefs
        Postfix
          Ident ident"*"
          Ident ident"data"
        BracketExpr
          Sym "seq"
          Sym "uint8"
        Empty [User]
/Users/tesuji/.nimble/pkgs/nesm-0.3.1/nesm.nim(208, 9) Hint: TypeDef
  Sym "MNIST_imgs"
  Empty
  ObjectTy
    Empty
    Empty
    RecList
      IdentDefs
        Postfix
          Ident ident"*"
          Ident ident"magic_number"
        Sym "int32"
        Empty
      IdentDefs
        Postfix
          Ident ident"*"
          Ident ident"n_imgs"
        Sym "int32"
        Empty
      IdentDefs
        Postfix
          Ident ident"*"
          Ident ident"n_rows"
        Sym "int32"
        Empty
      IdentDefs
        Postfix
          Ident ident"*"
          Ident ident"n_cols"
        Sym "int32"
        Empty
      IdentDefs
        Postfix
          Ident ident"*"
          Ident ident"data"
        BracketExpr
          Sym "seq"
          Sym "uint8"
        Empty [User]
serialization_nesm.nim(10, 15) template/generic instantiation from here
/Users/tesuji/.nimble/pkgs/nesm-0.3.1/nesm/generator.nim(100, 10) Error: undeclared identifier: 'data'

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xomachine commented on June 2, 2024

Not related to the bug but it looks like the structure was not described in correct way. seq[uint8] reads the number of elements first and then reads elements themselves.
To serialize such a structure you need to use special pragma-like options {size: N} and {sizeof: N} from the devel branch. Examples can be found here and here.

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xomachine commented on June 2, 2024

I can not reproduce it on both of latest master or devel (aad2ce3 and 076639c) NESM branches with nim-lang/Nim@35133d9

Could you please provide the commit hash of the NESM version you are using?

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mratsim commented on June 2, 2024

It's the latest released version that doesn't work (v0.3.1), I build NESM from head and it works. So closing.

And thanks for the extra info on the structure.

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