ngram | Fast n-Gram Tokenization | Natural Language Processing library
kandi X-RAY | ngram Summary
kandi X-RAY | ngram Summary
ngram is an R package for constructing n-grams ("tokenizing"), as well as generating new text based on the n-gram structure of a given text input ("babbling"). The package can be used for serious analysis or for creating "bots" that say amusing things. See details section below for more information. The package is designed to be extremely fast at tokenizing, summarizing, and babbling tokenized corpora. Because of the architectural design, we are also able to handle very large volumes of text, with performance scaling very nicely. Benchmarks and example usage can be found in the package vignette.
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ngram Key Features
ngram Examples and Code Snippets
x <- "a b a c a b b"
library(ngram)
ng <- ngram(x, n=3)
ng
# [1] "An ngram object with 5 3-grams"
print(ng, output="truncated")
# a b a
# c {1} |
#
# a c a
# b {1} |
#
# b a c
# a {1} |
#
# a b b
# NULL {1} |
#
# c a b
# b {1}
install.packages("ngram")
### Pick your preference
devtools::install_github("wrathematics/ngram")
ghit::install_github("wrathematics/ngram")
remotes::install_github("wrathematics/ngram")
ngram::ngram_asweka(x, min=2, max=3)
## [1] "a b a" "b a c" "a c a" "c a b" "a b b" "a b" "b a" "a c" "c a"
## [10] "a b" "b b"
Community Discussions
Trending Discussions on ngram
QUESTION
I just get start with asynchronous programming, and I have one questions regarding CPU bound task with multiprocessing. In short, why multiprocessing generated way worse time performance than Synchronous approach? Did I do anything wrong with my code in asynchronous version? Any suggestions are welcome!
1: Task description
I want use one of the Google's Ngram datasets as input, and create a huge dictionary includes each words and corresponding words count.
Each Record in the dataset looks like follow :
"corpus\tyear\tWord_Count\t\Number_of_Book_Corpus_Showup"
Example:
"A'Aang_NOUN\t1879\t45\t5\n"
2: Hardware Information: Intel Core i5-5300U CPU @ 2.30 GHz 8GB RAM
3: Synchronous Version - Time Spent 170.6280147 sec
...ANSWER
Answered 2022-Apr-01 at 00:56There's quite a bit I don't understand in your code. So instead I'll just give you code that works ;-)
I'm baffled by how your code can run at all. A
.gz
file is compressed binary data (gzip compression). You should need to open it with Python'sgzip.open()
. As is, I expect it to die with an encoding exception, as it does when I try it.temp[2]
is not an integer. It's a string. You're not adding integers here, you're catenating strings with+
.int()
needs to be applied first.I don't believe I've ever seen
asyncio
mixed withconcurrent.futures
before. There's no need for it.asyncio
is aimed at fine-grained pseudo-concurrency in a single thread;concurrent.futures
is aimed at coarse-grained genuine concurrency across processes. You want the latter here. The code is easier, simpler, and faster withoutasyncio
.While
concurrent.futures
is fine, I'm old enough that I invested a whole lot into learning the oldermultiprocessing
first, and so I'm using that here.These ngram files are big enough that I'm "chunking" the reads regardless of whether running the serial or parallel version.
collections.Counter
is much better suited to your task than a plain dict.While I'm on a faster machine than you, some of the changes alluded to above have a lot do with my faster times.
I do get a speedup using 3 worker processes, but, really, all 3 were hardly ever being utilized. There's very little computation being done per line of input, and I expect that it's more memory-bound than CPU-bound. All the processes are fighting for cache space too, and cache misses are expensive. An "ideal" candidate for coarse-grained parallelism does a whole lot of computation per byte that needs to be transferred between processes, and not need much inter-process communication at all. Neither are true of this problem.
QUESTION
I have dataframe
...ANSWER
Answered 2022-Mar-28 at 19:16A self join can help, the second condition is implemented in the join condition. Then the n-grams are created by combining the arrays of the two sides. When combining the arrays the element that is common in both arrays is omitted:
QUESTION
I'm using a TextVectorization Layer in a TF Keras Sequential model. I need to convert the intermediate TextVectorization layer's output to plain text. I've found that there is no direct way to accomplish this. So I used the TextVectorization layer's vocabulary to inverse transform the vectors. The code is as follows:
...ANSWER
Answered 2022-Mar-16 at 12:37Maybe try np.vectorize
:
QUESTION
I am trying to create an NLP neural-network using the following code:
imports:
...ANSWER
Answered 2022-Feb-13 at 11:58The TextVectorization
layer is a preprocessing layer that needs to be instantiated before being called. Also as the docs explain:
The vocabulary for the layer must be either supplied on construction or learned via adapt().
Another important information can be found here:
Crucially, these layers are non-trainable. Their state is not set during training; it must be set before training, either by initializing them from a precomputed constant, or by "adapting" them on data
Furthermore, it is important to note, that the TextVectorization
layer uses an underlying StringLookup
layer that also needs to be initialized beforehand. Otherwise, you will get the FailedPreconditionError: Table not initialized
as you posted.
QUESTION
I am trying to use the following code to vectorize a sentence:
...ANSWER
Answered 2022-Feb-06 at 12:57You have to first compute the vocabulary of the TextVectorization
layer using either the adapt
method or by passing a vocabulary array to the vocabulary
argument of the layer. Here is a working example:
QUESTION
I have a TensorFlow TextVectorization
layer named "eng_vectorization
":
ANSWER
Answered 2021-Dec-07 at 12:31The problem is related to a very recent bug, where the output_mode
is not set correctly when it comes from a saved configuration.
This works:
QUESTION
I have the following dataframe:
...ANSWER
Answered 2022-Jan-09 at 07:22So, given the following dataframe:
QUESTION
I am using the following function (based on https://rpubs.com/sprishi/twitterIBM) to extract bigrams from text. However, I want to keep the hash symbol for analysis purposes. The function to clean text works fine, but the unnest tokens function removes special characters. Is there any way to run unnest tokens without removing special characters?
...ANSWER
Answered 2022-Jan-09 at 06:43Here is a solution that involving create a custom n-grams function
SetupQUESTION
I am new to Python. I used collections.Counter to count the most frequent bigrams in a text:
...ANSWER
Answered 2021-Dec-28 at 18:33Use join()
to create a delimited string from a sequence.
QUESTION
I have the below script - which aims to create a "merge based on a partial match" functionality since this is not possible with the normal .merge()
funct to the best of my knowledge.
The below works / returns the desired result, but unfortunately, it's incredibly slow to the point that it's almost unusable where I need it.
Been looking around at other Stack Overflow posts that contain similar problems, but haven't yet been able to find a faster solution.
Any thoughts on how this could be accomplished would be appreciated!
...ANSWER
Answered 2021-Dec-21 at 21:28For anyone who is interested - ended up figuring out 2 ways to do this.
- First returns all matches (i.e., it duplicates the input value and matches with all partial matches)
- Only returns the first match.
Both are extremely fast. Just ended up using a pretty simple masking script
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