kandi X-RAY | scratch Summary
kandi X-RAY | scratch Summary
Top functions reviewed by kandi - BETA
- Entry point to the HFC channel
- Get channel
- Query chaincode query
- Returns an AppUser object with the given userId
- Enroll admin user
- Factory method
- Returns a new HLF client instance
- Try to get an AppUser object from a file
- Returns the property name
- Deserialize an AppUser
- Serialize appUser to a file
scratch Key Features
scratch Examples and Code Snippets
Trending Discussions on scratch
I would like to extract the definitions from the book The Navajo Language: A Grammar and Colloquial Dictionary by Young and Morgan. They look like this (very blurry):
I tried running it through the Google Cloud Vision API, and got decent results, but it doesn't know what to do with these "special" letters with accent marks on them, or the curls and lines on/through them. And because of the blurryness (there are no alternative sources of the PDF), it gets a lot of them wrong. So I'm thinking of doing it from scratch in Tesseract. Note the term is bold and the definition is not bold.
How can I use Node.js and Tesseract to get basically an array of JSON objects sort of like this:...
ANSWERAnswered 2021-Jun-15 at 20:17
Tesseract takes a
lang variable that you can expand to include different languages if they're installed. I've used the UB Mannheim (https://github.com/UB-Mannheim/tesseract/wiki) installation which includes a ton of languages supported.
To get better and more accurate results, the best thing to do is to process the image before handing it to Tesseract. Set a white/black threshold so that you have black text on white background with no shading. I'm not sure how to do this in Node, but I've done it with Python's OpenCV library.
If that font doesn't get you decent results with the out of the box, then you'll want to train your own, yes. This blog post walks through the process in great detail: https://towardsdatascience.com/simple-ocr-with-tesseract-a4341e4564b6. It revolves around using the jTessBoxEditor to hand-label the objects detected in the images you're using.
Edit: In brief, the process to train your own:
- Install jTessBoxEditor (https://sourceforge.net/projects/vietocr/files/jTessBoxEditor/). Requires Java Runtime installed as well.
- Collect your training images. They want to be .tiffs. I found I got fairly accurate results with not a whole lot of images that had a good sample of all the characters I wanted to detect. Maybe 30/40 images. It's tedious, so you don't want to do TOO many, but need enough in order to get a good sampling.
- Use jTessBoxEditor to merge all the images into a single .tiff
- Create a training label file (.box)j. This is done with Tesseract itself.
tesseract your_language.font.exp0.tif your_language.font.exp0 makebox
- Now you can open the box file in jTessBoxEditor and you'll see how/where it detected the characters. Bounding boxes and what character it saw. The tedious part: Hand fix all the bounding boxes and characters to accurately represent what is in the images. Not joking, it's tedious. Slap some tv episodes up and just churn through it.
- Train the tesseract model itself
- save a file:
font_propertieswho's content is
font 0 0 0 0 0
- run the following commands:
tesseract num.font.exp0.tif font_name.font.exp0 nobatch box.train
shapeclustering -F font_properties -U unicharset -O font_name.unicharset font_name.font.exp0.tr
mftraining -F font_properties -U unicharset -O font_name.unicharset font_name.font.exp0.tr
You should, in there close to the end see some output that looks like this:
Master shape_table:Number of shapes = 10 max unichars = 1 number with multiple unichars = 0
That number of shapes should roughly be the number of characters present in all the image files you've provided.
If it went well, you should have 4 files created:
shapetable. Rename them all with the prefix of
your_language from before. So e.g.
your_language.traineddata is the model. Copy that into your Tesseract's data folder. On Windows, it'll be like:
C:\Program Files x86\tesseract\4.0\tessdata and on Linux it's probably something like
Then when you run Tesseract, you'll pass the
lang=your_language. I found best results when I still passed an existing language as well, so like for my stuff it was still English I was grabbing, just funny fonts. So I still wanted the English as well, so I'd pass:
Is there an easy way to get a solution where there is a constraint on the maximum value of a derivative of a polynomial function
f(x), for a certain range of values for
Like was answered to this question,
scipy.optimize can deal with constraints on the individual coefficients, like in the following example:
ANSWERAnswered 2021-Jun-15 at 12:34
curve_fit method doesn't support additional constraints. However, you could implement a non-linear least-squares problem
This needs to be done in a local computer only. I have a
.csv file with two columns, and I Need to make a real-time line chart (it reads csv file every X seconds and refresh).
I tried some code from online, they work only with real url. My file is local, so I get this error in all the code I tried by copy/pasting.
Access to XMLHttpRequest at 'file:///C:/Programs/Stock/test.csv' from origin 'null' has been blocked by CORS policy: Cross origin requests are only supported for protocol schemes: http, data, chrome, chrome-extension, chrome-untrusted, https.
ANSWERAnswered 2021-Jun-15 at 07:27
Here is the basic example of plotting data from the python flask and HTML + JS.
I'm having a table similar to this:first last date pos john doe 18-03-2021 harris potter 10-06-2021 john doe 10-05-2021 harris potter 14-06-2021 jessica potter 14-06-2021 kermit foster
The use case is as follow:
- The pos column correspond to a positive covid test
- The date column correspond to the vaccination date
To be elligible for a covid certificate, some one must either:
- Been tested positive and have got 1 vaccine
- Have receive 2 vaccine
I'm trying to write a query that return me: totalDose, totalRequieredDose
- If he has tested positive, the totalRequiredDose is 1 and if he has got 1 vaccine, he is elligible. As such, for Harry Potter, totalDoses=1 and totalRequieredDoses=1 and is elligible
- If he has not been tested positive, the totalRequiredDose is 2 and if he has got 2 vaccines, he is elligible. As such, for John Doe, totalDoses=2 and totalRequieredDoses=2 and is elligible
As Jessica Potter have a vaccine and no pos date, she must have 2 vaccines. So the value 1/2 And Kermit foster have no pos value, he is 0/2 Etc.
I'm scratching my head to write a query (or pl/sql) that could return me such table.
Could someone give me some hints ?...
ANSWERAnswered 2021-Jun-12 at 16:01
We can aggregate by first and last name. The total doses is simply the count of non
NULL vaccination dates. For the total required number of doses, we can start with a value of 2. This value can then be offset by 1 assuming there exists a non
NULL date for the
pos column, indicating that a given person tested positive at some point.
Based on the guide Implementing PCA in Python, by Sebastian Raschka I am building the PCA algorithm from scratch for my research purpose. The class definition is:...
ANSWERAnswered 2021-Jun-11 at 12:52
When calculating an eigenvector you may change its sign and the solution will also be a valid one.
So any PCA axis can be reversed and the solution will be valid.
Nevertheless, you may wish to impose a positive correlation of a PCA axis with one of the original variables in the dataset, inverting the axis if needed.
I need to render a heatmap with 5000x5000 size (25 million points) and update it every 10 seconds.
Question: What approach I should follow if I would like to write this from scratch?...
ANSWERAnswered 2021-Jun-11 at 09:39
If you are displaying this in a single regular monitor (Full HD) that has a 1920 x 1080 resolution you won't probably be able to display every single point.
This is because the resolution is actually the number of pixels you can represent - so your max, considering you are using the whole screen, would be 1920 pixels x 1080 pixels (~2M pixels/dots).
So, in order to represent the amount of pixels you want, in a single regular monitor you have to go with the options below:
- Group the items;
- Adding a panel with scrolling bars;
- Reduce the data set.
Here you can find a good post about a strategy to group the items and them plot them using D3: https://int21.io/post/50-million-points/index.html
Tl Dr. If I were to explain the problem in short:
- I have signals:
ANSWERAnswered 2021-Jun-11 at 04:07
Following code adds a memory to the signals which can be wiped using
MultiSig.reset() to reset the count of all signals to 0. The memory can be queried using
MultiSig.query_memory(key) to return the number of hits for that signal at that time.
For the memory function to work, I had to add unique keys to the signals to identify them.
I am learning the basics of html and css, and am trying to build my own blog from scratch, coding it all from the ground up, because that's the only way I'll really learn. I want it to be responsive to different screen widths, so I am using the bootstrap grid, but building my own custom components because the bootstrap ones seem a bit too cookie-cutter. Specifically, what I am having a hard time with is a single DIV element at the top of the page, where I want to contain my most recent blog post. It contains a floated image, and two columns of text. I have placed everything within rows in the grid, and what I am expecting is this: When someone begins minimizing the screen, or when a smaller device is used to view the site, I want the words to just realign to whatever screen size they have, and I do not want the scrollbars to appear. Is there a way this can be done. I have included the code below, (all of it), but the relevant DIV is posted first there at the top, and a picture of what it looks like at full screen size, and also one where the window is reduced in size.
Here is the DIV, and the relevant CSS. Just in case I don't understand what might be relevant, the entire code is at the very bottom. Thank you for any time taken to help me. There are problems with positioning at the top, too, but I think I can figure that out, or I'll have to make that another question. Thanks again.
DIV Element HTML:...
ANSWERAnswered 2021-Jun-10 at 21:23
Good for you for trying to code a project like this from scratch! That's how I learn best too.
You're getting scrollbars because you're setting the height of the div in your
#fbPost instead of letting it be determined by the content, and then you also set
overflow: auto, which tells the browser to show a scrollbar if the content of a container overflows the container, and to hide the scrollbar if it doesn't. You can read more about that here
Also, as a best practice, an
id is meant to be unique. So there should only be one thing in your html with
id="fbPost", you shouldn't put that on each of your sections. It's better to use classes like your
ourCard class to style multiple elements.
In terms of how to make the content two columns, you can just use the
column-count css property.
I also recommend looking into and learning CSS Grid for layouts instead of using floats;
Here's a very basic JSFiddle showing what I'm talking about: https://jsfiddle.net/karlynelson/vd7zq8h4/29/
You can use media queries to make it go down to one column of text at a certain point, or use fancy css grid min-max and auto-fill to do it automatically.
I've got some questions about nextJS and SSG (static site generator)
1 - I want to manage my app state globally so I want to use react's context api. As I understand using redux in next js app disables SSG. If I use react context api does that disable too?
2 - I know that I can do server side rendering but I want to have a custom nodejs server that I created from scratch. And I want to fetch data from my nodeJS server in the client side. Does making that way disable SSG and bad for performance?...
ANSWERAnswered 2021-Jun-10 at 17:58
This documentation will help you clarify your understanding on how Next.js handles automatic static optimization. Take a look at the caveats in that documentation to understand when that gets disabled at a global level.
Beyond that, whether or not each individual page behaves as SSG, ISR, SSG + CSR or SSR is a matter of the data requirements of the individual page. See this documentation to better understand the different ways Next.js handles each page depending on the data requirements.
Now, to answer your two questions directly:
I cannot find any indication that using Redux in Next.js disables SSG. In fact, here is an official example using Redux to illustrate both an SSG and SSR Next.js page implementation. Same goes for the react context API. On the other hand, it is entirely possible for you to unintentionally disable SSG by both using Redux / react context while requiring dynamic data in your page. Read up on the documentation linked in the second paragraph above to understand this better.
Fetching data from your custom NodeJS server client-side does not necessarily disable SSG. It will disable SSG if you require dynamic data on each page load. You have the choice to either statically generate your page (SSG + CSR) and then request your data client-side post page load (think axois / browser fetch API + loading indicator); OR, if you need the data to be present immediately upon page load (SSG & SSR), you can use
getStaticPathsto inject that data at build time (SSG) or
getServerSidePropsto inject the data on each page load (SSR).
I am trying to create transfer between accounts of the same user with different crypto currencies using the Coinbase API. I am using it's official library which I know wasn't exactly maintained but I tried to debug everything manyually and it seems that the request it's sending to the API server is correct according to the official documentation.
Specifically, it uses GuzzleHttp\Psr7 to send to /v2/accounts/[sender-account-id]/transactions the following parameters:...
ANSWERAnswered 2021-Jun-10 at 13:52
Ok so after a bit of even more digging I found an answer to a different question detailing how I could interact with the /v2/trades endpoint which actually does what I need it to do.
You can find more details here, just mind the fact that the endpoint for making the original order is /v2/trades instead of /v2/trade as specified there. Otherwise, his description is accurate and works as of today.
I should also mention that I did open a ticket to Coinbase before getting this solution and their response was that they are only providing support through their public documentation which is short for "you're an idiot, it's all written there".
Needless to say that the public API documentation does not mention the /v2/trades endpoint, instead it documents the /transaction endpoint which does not work for transfers as specified in the original question.
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