lazy | A lazy decoder for syntax
kandi X-RAY | lazy Summary
kandi X-RAY | lazy Summary
this code takes in a hypergraph and a language model then outputs a sentence. it is split into a library (search/) and a standalone wrapper (alone/). the library is also in moses (-search-algorithm 5) and cdec (--incremental_search $lm). compiling requires boost >= 1.41. tested on linux. usage after compiling, the decoder is bin/decode. run without an argument for help. to run, you will need one language model, feature weights, and hypergraphs. the language model must be in arpa or kenlm format. pass -l lm where lm is the file name. feaure weights can be specified in a file using -w or on the command line with -w. weights are key=value pairs like cdec. the hard-coded features are languagemodel, languagemodel_oov, and wordpenalty. wordpenalty is word count times -1/ln(10) for odd historical reasons dating back to hiero. the feature definitions are compatible with moses and cdec. hypergraphs are stored in a directory with one file per sentence. the files are named starting with 0. the first line of each file is. then the file enumerates each vertex in bottom-up order (i.e. they can only reference vertices that have already
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QUESTION
Lazy fold uses a lot of RAM. In Data.List
, foldl'
provides a left fold that uses strict evaluation. For example, the following computes the sum of 10 million zeros with little increase in RAM usage.
ANSWER
Answered 2022-Apr-03 at 01:58foldl'
only evaluates the intermediate state to weak head normal form—i.e. up to the first constructor. That's the most a generic function can do, and what functions that are called "strict" generally do. Evaluating (x1, y1) <+> (x2, y2)
until it looks like a constructor gives (x1 + x2, y1 + y2)
, where the parts are still unevaluated (they have been "protected" by the (,)
). Through the iteration, foldl'
being strict keeps the state in the form (_, _)
instead of (_, _) <+> (_, _) <+> ...
, but the _
s grow into huge unevaluated terms of form _ + _ + _ + ...
.
Modify <+>
to evaluate the additions before it exposes the constructor.
QUESTION
I am writing a model Series class (kinda like the one in pandas) - and it should be both Positional and Associative.
...ANSWER
Answered 2022-Mar-31 at 13:17First, an MRE with an emphasis on the M1:
QUESTION
How can I escape metacharacters in a Raku regex the way I would with Perl's quotemeta function (\Q..\E
)?
That is, the Perl code
...ANSWER
Answered 2022-Feb-10 at 00:03You can treat characters in a Raku regex literally by surrounding them with quotes (e.g., '.*?'
) or by using using regular variable interpolation (e.g., $substring
inside the regex where $substring
is a string contaning metacharacters).
Thus, to translate the Perl program with \Q...\E
from your question into Raku, you could write:
QUESTION
I like the idea of the lazy ranges you can make with std::views::iota
but was surprised to see that iota
is currently the only thing like it in the standard; it is the only "range factory" besides views::single
and views::empty
. There is not currently, for example, the equivalent of std::generate
as a range factory.
I note however it is trivial to implement the semantics of generate
by using a transform view on iota and just ignoring the value iota passes to transform i.e.
ANSWER
Answered 2022-Feb-17 at 17:10The reason why generate2
cannot work is that it does not model the range
concept, that is, the type returned by its begin()
does not model input_iterator
, because input_iterator
requires difference_type
and value_type
to exist and i++
is a valid expression.
In addition, your iterator does not satisfy sentinel_for
, which means that it cannot serve as its own sentinel, because sentinel_for
requires semiregular
which requires default_initializable
, so you also need to add default constructors for it.
You also need to rewrite bool operator!=(...)
to bool operator==(...) const
since operator!=
does not reverse synthesize operator==
. But it's easier to just use default_sentinel_t
as sentinel in your case.
if you add them to iterator
you will find the code will be well-formed:
QUESTION
This is a React web app. When I run
...ANSWER
Answered 2021-Nov-13 at 18:36I am also stuck with the same problem because I installed the latest version of Node.js (v17.0.1).
Just go for node.js v14.18.1
and remove the latest version just use the stable version v14.18.1
QUESTION
I am trying to encode a small lambda calculus with algebraic datatypes in Scheme. I want it to use lazy evaluation, for which I tried to use the primitives delay
and force
. However, this has a large negative impact on the performance of evaluation: the execution time on a small test case goes up by a factor of 20x.
While I did not expect laziness to speed up this particular test case, I did not expect a huge slowdown either. My question is thus: What is causing this huge overhead with lazy evaluation, and how can I avoid this problem while still getting lazy evaluation? I would already be happy to get within 2x the execution time of the strict version, but faster is of course always better.
Below are the strict and lazy versions of the test case I used. The test deals with natural numbers in unary notation: it constructs a sequence of 2^24
suc
s followed by a zero
and then destructs the result again. The lazy version was constructed from the strict version by adding delay
and force
in appropriate places, and adding let
-bindings to avoid forcing an argument more than once. (I also tried a version where zero
and suc
were strict but other functions were lazy, but this was even slower than the fully lazy version so I omitted it here.)
I compiled both programs using compile-file
in Chez Scheme 9.5 and executed the resulting .so
files with petite --program
. Execution time (user only) for the strict version was 0.578s, while the lazy version takes 11,891s, which is almost exactly 20x slower.
ANSWER
Answered 2021-Dec-28 at 16:24This sounds very like a problem that crops up in Haskell from time to time. The problem is one of garbage collection.
There are two ways that this can go. Firstly, the lazy list can be consumed as it is used, so that the amount of memory consumed is limited. Or, secondly, the lazy list can be evaluated in a way that it remains in memory all of the time, with one end of the list pinned in place because it is still being used - the garbage collector objects to this and spends a lot of time trying to deal with this situation.
Haskell can be as fast as C, but requires the calculation to be strict for this to be possible.
I don't entirely understand the code, but it appears to be recursively creating a longer and longer list, which is then evaluated. Do you have the tools to measure the amount of memory that the garbage collector is having to deal with, and how much time the garbage collector runs for?
QUESTION
Given the following code, it seems that I cannot iterate over a Buf if it had been assigned to a variable, unless I cast it to a list, even though it's not a lazy sequence. What gives?
...ANSWER
Answered 2021-Dec-23 at 22:40The reason it fails, is that:
QUESTION
Today I did some tests on the nightly module std::lazy
. It works well in local variable. However, when I defined a const
variable, it gave me two different values. Seems the Colsure is called multiple times.
ANSWER
Answered 2021-Dec-15 at 09:27This is my code, can anyone tell me why?
Because you're confusing const
and static
.
Per the official documentation:
A constant item is an optionally named constant value which is not associated with a specific memory location in the program. Constants are essentially inlined wherever they are used, meaning that they are copied directly into the relevant context when used. This includes usage of constants from external crates, and non-
Copy
types. References to the same constant are not necessarily guaranteed to refer to the same memory address.
(note that the phrasing of the last sentence indicates consts could be promoted to statics and share a memory address, but there's no guarantee there, and while statics can be inlined it probably should not be observable through safe rust so should mostly be irrelevant).
In essence, your snippet is semantically equivalent to:
QUESTION
I want to get the last element of a lazy but finite Seq in Raku, e.g.:
...ANSWER
Answered 2021-Dec-04 at 19:49What you're asking about ("get[ing] the last element of a lazy but finite Seq … while keeping the original Seq lazy") isn't possible. I don't mean that it's not possible with Raku – I mean that, in principle, it's not possible for any language that defines "laziness" the way Raku does with, for example, the is-lazy
method.
If particular, when a Seq is lazy in Raku, that "means that [the Seq's] values are computed on demand and stored for later use." Additionally, one of the defining features of a lazy iterable is that it cannot know its own length while remaining lazy – that's why calling .elems
on a lazy iterable throws an error:
QUESTION
What is the preferred way to make a VS connected service (NSwag) injected into classes/controllers. I have found a lot of suggestions on the net to use this form:
...ANSWER
Answered 2021-Sep-26 at 13:24Ok, I actually solved this problem by poking around through OpenApiReference
, but it requires manual modification of csproj file. Additional Options
node has to be added to OpenApiReference
item group, to instruct NSwag to NOT expose BaseUrl and to also generate an interface, which eases the work with setting up DI without additional code.
Visual Studio team should really add these two checkboxes to Connected Services screens/configuration for OpenAPI.
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