Lumin | machine learning project for describe sentiment | Natural Language Processing library
kandi X-RAY | Lumin Summary
kandi X-RAY | Lumin Summary
machine learning project for describe sentiment on twitter
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Top functions reviewed by kandi - BETA
- Return a generator of all updates
- Send request to API
- Scrap the Tweet from twitter
- Send a post to telegram
Lumin Key Features
Lumin Examples and Code Snippets
Community Discussions
Trending Discussions on Lumin
QUESTION
I converted an image to grayscale, and then I wondered that was going on inside. I found 2 ways how it could be, but what is really going on inside? 2 ways:
Average the channels
This method involves taking the arithmetic average of the pixel values.
Сhannel-dependent luminance perception
It is more biological way. It involves the use of
0.2126 * R-value + 0.7152 * G-value + 0.0752 * B-value.
The method is based on the presence of cones in people`s eyes.
Source: www.kdnuggets.com.
But what is the OpenCV using for grayscale?
...ANSWER
Answered 2022-Mar-20 at 13:35RGB[A] to Gray:Y←0.299⋅R+0.587⋅G+0.114⋅B
Source: docs.opencv.org.
QUESTION
This is my code
...ANSWER
Answered 2022-Mar-14 at 04:14You may want to check what the value of inviteLink
is. fetchInvite()
is expecting it to be some String
, but it isn't a String
, causing this error to occur (strings have the method .matchAll()
on them, so this error is occurring because inviteLink
is not a string). Log it to the console and see for yourself. It will probably be either undefined
or an Array
.
This specific error isn't an issue of djs v12 versus v13. This is an issue with your use of .match()
. Let's take a look at it:
QUESTION
ANSWER
Answered 2022-Feb-18 at 20:13I made a widget as a fun exercise and a proof-of-concept, called PixelDataOverlay
. It has a background
builder and an overlay
builder.
When being used, it'll call background
builder first to build the underlying widget (a picture or whatever). And then it will extract pixel data from what's built. Then it will call overlay
builder and pass the pixel data back to you, so you can decide how to build the overlay
based on the information you received.
Key Usage:
QUESTION
How can I encode HDR10 videos from RGB images using the ffmpeg command-line, with the proper color and luminance metadata?
There are a lot of ffmpeg command-line examples floating around when searching information about how to encode HDR10 streams properly, but I didn't find any that has a comprehensive list of all the parameters you can tune when using RGB frames as inputs.
For example:
- This article has a lot of information, but uses an existing video as input.
- Similarly, this article uses an existing video as input
ANSWER
Answered 2022-Feb-02 at 19:51Traditional videos need to have the following sets of metadata:
- The transfer function determines how you should map encoded RGB or YUV values into display luminance (
-color_trc
in ffmpeg options,transfer
in x265 options). Common options are HLG (arib-std-b67
) or PQ (smpte2084
). - The colorspace primaries define how encoded RGB values map into real colors (
-color_primaries
for ffmpeg,colorprim
for x265). For HDR10 the most common option isbt2020
. - The color matrix is used to convert between RGB values (which are used to display data on the screen) and YUV values (which make the video encoders more efficient, because they roughly separate luma (Y) from chroma (UV) channels), and correspond to
-colorspace
in ffmpeg andcolormatrix
in x265. For HDR10 the most common option isbt2020nc
. - The signal range determines if RGB values between 0-100% are mapped to the full 0-255 (in 8-bit) or 0-1023 (in 10-bit) range, or if a margin is reserved for internal use (
-color_range
in ffmpeg,range
in x265). It is traditionally "limited" (or: "tv", "narrow") in videos and "full" (or: "pc") in RGB images.
HDR10 defines additional metadata on top of that, which are intended to be used by the OS/player to tune the video output on non-HDR capable screens so that they can be displayed as best as they can under those constraints:
- MaxFALL and MaxCLL describe resp. the average and maximum luminance of the video (
max-cll
x265 option) - Mastering display characteristics describe the "perfect" display the video is intended to be displayed on (
master-display
x265 option)
Now, a few things need some special care:
- Traditional metadata can be set in both the video container and the x265 stream (so they should be set in both ffmpeg and x265 so as to avoid mismatch when playing).
- Traditional metadata should be set for both the input (before
-i
) and output (after) formats, so that ffmpeg can do proper conversions when encoding. - HDR10 metadata are only present in the x265 options; ffmpeg knows nothing about them and they don't affect the video pixel values.
- Unfortunately the default filter used by ffmpeg for format conversion (swscale, or
-vf scale
in the command-line) has a lot of issues when applied automatically. I found that it is best to always specify at least the signal range explicitly, or even usezscale
which replaces it and is much better behaved. Several issues exist with swscale, so it is tricky to get right. - YUV to/from RGB conversions (which is what we're doing here since we use RGB images as inputs!) are different between traditional SDR (BT709) videos and HDR10 (BT2020). This is a very common source of errors, because a lot of ffmpeg internals assume the default (potentially wrong) conversion if not explicitly specified in both input and output formats!
- The
-pix_fmt
for the input images should be determined automatically, but I included it here to be comprehensive ; it is also required if you want to stream from raw RGB data. - The
-pix_fmt
for the output video specifies that we want to pass 10-bit YUV data to the encoder and is required. - This command-line assumes your TIFF images already contain the correct color profile (they are already HDR10 Rec2020 HLG images). If you want to do conversions from e.g. sRGB or other spaces you need to set the specific formats for the input file and
zscale
filter properly.
Bearing that in mind, we can use the following command-line to convert Rec2020 HLG RGB images into an HDR10 Rec2020 HLG x265/HEVC video:
QUESTION
I made a simple register-login service with PHP and MySQL, but when I try to log in, it returns fails even though I entered the correct ID and Password.
I'm not sure but I think password_verify()
is the trouble.
The structure of my database is here
...ANSWER
Answered 2022-Jan-31 at 06:19This may help you php password_verify not working with database
Check whether the hash is getting stored in database properly or not. Dump the hash you are getting from database and hashed password and check are they same or not.
QUESTION
I am remaking a GUI calculator app in Tkinter, in order to learn about classes, methods, attributes, and also to shorten my original code. In order to shorten the code, I made a frame class that generates frames, entries, labels and dropdown menus, so I don't have to create them individually. Everything went well until I got to the dropdown menu part. When the user selects a different option from the Filters - dropdown menu like V, or B or L etc. the value in frame 1 -> entry[1] doesn't update. The method that updates the value in that entry is called add(self) and it's a part of calculator class. Here is the simple version
...ANSWER
Answered 2022-Jan-07 at 16:45There are 2 problems:
- The first one is that you mentioned and to fix it:
renamedef add(self)
todef add(self, e)
and renameadd()
toadd(None)
. Then changelambda event: self.add
toself.add
- The second one is:
AttributeError: 'frame' object has no attribute 'frame_camera'
but is not question related
QUESTION
I have a Pandas DataFrame, luminance_df
, that looks like this:
So far, I'm building a single multi-chart HTML file like this:
...ANSWER
Answered 2021-Dec-08 at 15:06I believe you only need to do a countourf
:
QUESTION
I am trying to convert a dataset from long to wide format in R.
In particular, my dataset looks like this:
...ANSWER
Answered 2021-Nov-18 at 13:45You can use pivot_wider
from the tidyr
package:
QUESTION
I'm starting to get errors when I am executing a test for a release variant which was always working fine. The code has always been executed in a Docker container so we can ensure that the build will always be clean.
Today for some reason with no changes at all to the code, I am starting to see errors on the test run:
...ANSWER
Answered 2021-Sep-03 at 11:31I've found the issue and I was able to fix it.
The issue was that one of the external libraries the app depends on has a dependency on androidx.core:core-ktx:+
which meant that was always compiling with the latest version. My app is still working on SDK 28, but the latest version of androidx.core:core-ktx
has the minimal SDK of 31, which resulted in this conflict.
QUESTION
I've run into an issue while trying to build a page that allows the user to click on a word and get its definition in a bootstrap popover. That is achieved by sending an API request and updating the state with the received data.
The problem is that the popover only appears after the second click on the word. The console.log()
in useEffect()
shows that every time a new word is clicked an API request is made. For the popover to appear the same word must be clicked twice. It'd be better if it only took one click.
ANSWER
Answered 2021-Oct-01 at 00:16Here's what I think is happening:
- Component renders
- Start fetching definition for "luminous".
- The definition of "luminous" has finished being fetched. It calls
setApiData(data)
. - Component rerenders
- If you click "luminous", the popper is shown immediately, this is because the data for the popper is ready to use and setSelectedWord("luminous") does nothing.
- If you click another word, such as "pity", the popper attempts to show, but
setSelectedWord("pity")
causes the component to start rerendering. - Component rerenders
- Start fetching definition for "pity".
- The definition of "pity" has finished being fetched. It calls
setApiData(data)
. - Component rerenders
- If you click "pity", the popper is shown immediately, this is because the data for the popper is ready to use and setSelectedWord("pity") does nothing.
Selecting another word will repeat this process over and over.
To fix this, you need to first make use of the show
property to show the popover after rendering it out if it matches the selected word. But what if the word appears multiple times? If you did this for the word "her", it would show the popover in multiple places. So instead of comparing against each word, you'd have to assign each word a unique ID and compare against that.
To assign words an ID that won't change between renders, we need to assign them IDs at the top of your component and store them in an array. To make this "simpler", we can abstract that logic into a re-useable function outside of your component:
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install Lumin
You can use Lumin like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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