zug | Transducers for C — Clojure style higher order push/pull
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Transducers for C++ — Clojure style higher order push/pull sequence transformations
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QUESTION
I'm a Scrapy enthusiast into scraping for 3 months. Because I really enjoy scraping, I ended up being frustrated and excitedly purchased a proxy package from Leafpad.
Unfortunetaly, when I uploaded them to my Scrapy spider, I recevied ValueError:
I used scrapy-rotating-proxies to integrate the proxies. I added the proxies which are not numbers but string urls like below:
...ANSWER
Answered 2022-Feb-21 at 02:25The way you have defined your proxies list is not correct. You need to use the format username:password@server:port
and not server:port:username:password
. Try using the below definition:
QUESTION
I am looking at this line of EBNF:
...ANSWER
Answered 2022-Jan-26 at 02:34The |
would be the most-loosely bound thing. In other words:
is equivalent to
| ([])
and NOT equivalent to ( | )[]
.
So your first interpretation.
QUESTION
When I choose a number between 1 to 9 and input a number in the console, the method does work and makes the correct move. But my question is how can avoid that the programm gets crashed as soon as I input a letter instead of a number.
...ANSWER
Answered 2021-Oct-14 at 09:24Every nextXYZ
method has an equivalent hasNextXYZ
method that lets you check its type. E.g.:
QUESTION
I want to scrape data from a webpage with a dynamic table. The table contains information on train rides.
This is the website: https://www.laerm-monitoring.de/zug/?mp=3/
I tried to request the data with a simple mounted request session, but I only got basic HTML data without the data from the table.
...ANSWER
Answered 2021-Apr-24 at 19:43I have used Selenium to do something similar with python. Not sure if that works for your. Basically open the website and right click on table and do inspect element
. After that Go over to the div
that the table belongs to and right-click
to copy full xpath
. After you found the xpath, you can scrape it using selenium. See this answer .
The only problem is that Selenium actually opens the browser and doesn't run in background. I think you can do it silently, but I have never done it.
Another thing is that websites can block you if repeated automated requests come from a single IP. You can use tor to make request from a new IP every time you make a request. I have done something like that with twitter here.
QUESTION
we try to make a Covid-19 simulation based on three different scenarios with R Shiny. All scenarios got different default values from a sliderInput, that need to be passed to server-functions based on the selected setting and (adittional) user input.
I got the following tabSetPanel in my UI:
...ANSWER
Answered 2021-Apr-10 at 13:03Your variable num_people
is only available inside the observer. If you want it outside, you can create a reactiveVal
object. Try this
QUESTION
I can't seem to find the problem in header.html which is leading to
...ANSWER
Answered 2020-Sep-24 at 06:58Your base.html
includes header.html
, and your header.html
extends base.html
, causing an infinite loop.
You should choose one or the other. For this case you'd probably want to keep the {% include ... %}
.
QUESTION
I'm trying to push an object into an empty array in vue, but when i'm doing it like below, the console.log will give me "hitlist: [Object object]
the code:
...ANSWER
Answered 2020-Jul-02 at 10:59You should use computed properties for your problem, just add an computed property called hitList
which filters the list by searchText
by list.filter(...)
:
QUESTION
I'm new to python and don't know why I get this kind of error.
I have a csv file from which I read some data. I compare the data with another csv file and if I find similarities I want to copy some data from the second file. However here's the problem:
...ANSWER
Answered 2020-Jun-01 at 14:28A csv reader gets 'used up' if you iterate over it. This is why the second loop doesn't see the first row, because the first loop has already 'used' it. We can show this by making a simple reader over a list of terms:
QUESTION
I'm having trouble combining powershell native regex capture group syntax $n
with the .net one $args.groups[n].value
.
The HTML code is as follows:
ANSWER
Answered 2020-May-15 at 19:26There's only one syntax - -replace
internally calls Regex.Replace()
, and Regex.Replace()
also supports $N
references.
Your problem is two-fold - first, when you use double-quotes, like so: "$1"
, PowerShell will attempt to expand/resolve $1
as a variable before the substitution pattern is passed to -replace
.
Second problem is that PowerShell only expands variable values in double-quoted strings, not whole expressions. For that, you need to enclose the expression in a subexpression $()
.
So, either escape the $
with a backtick (`
) and enclose the expression in $()
, or use a single-quoted string:
QUESTION
I programmed a very easy game which works the following way:
Given an 4x4 field of squares, a player can move (up, right, down or left).
Going on a square the agent never visited before gives the reward 1.
Stepping on "dead-field" is rewarded with -5 and then the game will be resetted.
Moving on a field that was already visited is rewarded with -1
Going on the "win-field" (there's exactly one) gives the reward 5 and the game will be resetted as well.
Now I want an AI to learn to play that game via Q-Learning.
How I organized the Inputs / feature engineering:
An input for the net is an array with the shape 1x4 where arr[0] represents the field above (when moving up), arr[1] represents the field to the right, arr[2] the one below, arr[3] the one to the left.
Possible values the array can hold: 0, 1, 2, 3
0 = "dead field", so the worst case
1 = this would be outside of the 4x4 field (so you can't step there) or the field was already visited
2 = unvisited field (so that is something good)
3 = "win field", so the best-case
As you see, I ordered them by their reward.
Since the game takes an input the same way (0 = move up, 1 = move to the right, 2 = move down, 3 = move to the left), the only thing the AI would have to learn is basically: Choose the array index that holds the greatest value.
But unforntunately it doesn't work, the net just doesn't learn, not even after 30.000 episodes.
Here's my code (including the game at the beginning):
...ANSWER
Answered 2020-Apr-12 at 12:56I finally found a solution for that, it took me almost a week.
The key was to have my inputs being one-hot-encoded. This makes me have 16 input-neurons instead of 4, but it works now. After 1.000 episodes I have mostly around 91 % successfull episodes.
I'm still wondering about the fact, that it didn't work when the input wasn't one-hot-encoded. I know that an ANN will automatically use the greater-smaller relations between the different inputs a neuron takes, what can be a disadvantage. But since I orderd my inputs that way, that if one input is greater than a different one, that also means, that the output should be greater the same way. So there is no disadvantage here if the ANN uses the relations, contrarily, that should be an advantage.
Therefore I thought it would be good to not one-hot-encode the inputs because that way I reduce the dimensionality immensely (4 instead of 16).
Apparently that idea didn't work though.
However, as I said, with 16 Inputs it works now.
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