mli | Machine Learning Interface for Rust | Machine Learning library

If you look at just one element at a time, I think that as.data.frame does a pretty decent job. While I'll demonstrate using the abbreviated data (that I edited into your question), and the first element looks like:

When you split a module into a signature and an implementation, only the information in the signature can be used by other modules and anything else is private to the implementation. So when other modules look at your modules A and B, all they see is type t and another type t and they have no idea that those refer to the same type.

If you want to expose the information that A.t = B.t, that information needs to be part of the signature. So simply change type t in the signature of B to type t = A.t and now this equality will be part of the module's public interface and can be relied on by other modules.

Many of the additions to the language or stdlib are followed by backporting libraries usually called *-shims.

For your problem, there is

https://github.com/ocaml-ppx/ocaml-syntax-shims

Grouped by 'iso3c', get the count of unique elements in 'var', create a logical vector out of it, get the row index (.I) and subset based on that column

1. In the root directory, these should be a file called mylib.opam with content similar to this one. Then, the (public_name mylib) s-expression should be added to library in mylib/src/dune. Finally, making sure to be in the root of the project, the library shall be built with dune build and installed with opam install ..
   For actually using the library in another project, even in a different dune workspace, all it's needed is to add (libraries mylib) to the dune file of project that will use the library.
2. The (private_modules priv) s-expression should be added to library in mylib/src/dune. Then, mylib.ml needs to be created with the following content: module Mymodule = Mymodule: this will make sure that only Mymodule will be exposed under the package Mylib.

It looks like you wish to lump together regions with less than 5 fatalities into an "other" category. This is straightforward in base R

The main problem could be setRegion is handled asynchronously so once you try to filter further by its value in handleSubmit then the value is most probably not there. See down below the suggested modifications on your component.

The first thing is to add onChange event to select instead of form:

Immediate values in the usual OCaml implementation have the low bit set, and the variant hash is an immediate value. So if you're looking at variant hash values in C++ you can be sure that the value 0 will never be returned by caml_hash_variant.

If you look at the code, the final value is generated either by Val_int() or Val_long(). In the definitions of these macros you'll see that they guarantee that the low bit is set.

I haven't done any kind of analysis of the code, but the value -1 is at least superficially possible as a hash value, since its low bit is set.

Update

The low bit is set on immediate values as a marker for the garbage collector. So it's a convention that must be followed strictly. (IMHO it's one of many really nice design tradeoffs in the OCaml implementation.)

You can create x.ml containing the sig, y.ml containing the module, and z.ml containing that module. You don't need to do anything special to tell the compiler that Y : X and Z : X. The compiler infers the module type automatically from the fact that the module conforms to the type i.e. it implements every binding that the module type needs. If Y or Z don't conform, the type error will be shown at the point of use.

If you want to restrict the module type at the point of definition that's also doable, by giving each module an interface file and includeing the required signature there. For example: