lifter | A generic query engine , inspired by Django ORM | Object-Relational Mapping library
kandi X-RAY | lifter Summary
kandi X-RAY | lifter Summary
A generic query engine, inspired by Django ORM
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Top functions reviewed by kandi - BETA
- Get a value from the cache .
- Resolve an attribute .
- Build a filter from the given kwargs .
- Handle select query .
- Sets up a test function .
- Return the query as a string .
- Return a wrapper for the given query .
- Creates a new Meta instance .
- Initialize the query set .
- Parse results .
lifter Key Features
lifter Examples and Code Snippets
Community Discussions
Trending Discussions on lifter
QUESTION
librosa.feature.mfcc(y=None, sr=22050, S=None, n_mfcc=20, dct_type=2, norm='ortho', lifter=0, **kwargs)
The librosa MFCC function does not contain an parameter to be passed for the number of mel filters to be used. Is there a way to define it or does it use the default value of '''n_mels=128''' used in librosa.filters.mel.
...ANSWER
Answered 2021-Oct-05 at 11:39The mfcc function will pass additional keyword arguments to librosa.feature.melspectrogram as specified in the doc under kwargs.
kwargs: additional keyword arguments Arguments to
melspectrogram, if operating on time series input
If you go to melspectrogram, you'll see it is again linked to librosa.filters.mel under kwargs.
kwargs: additional keyword arguments Mel filter bank parameters. See
librosa.filters.melfor details.
So, librosa.filters.mel is where you should check out for those parameters. This function has all the parameters you need here.
librosa.filters.mel(sr, n_fft, n_mels=128, fmin=0.0, fmax=None, htk=False, norm='slaney', dtype=)
To summarize, you can pass parameters like n_mels, fmin and fmax or temporal parameters like n_fft (as defined in librosa.filters.mel) or hop_length (as defined in librosa.features.melspectrogram).
QUESTION
i have a fork-lifter who takes the item from the truck and stock it in the rectangular node. The problem is that i want that the fork-lifter stock the agent according to the attractors. Instead, the operator goes in the same point every time. Why?(i did the same with another flowchart and same blocks and there is no problem, maybe a network problem?).
...ANSWER
Answered 2021-Dec-06 at 06:58YOu have to manually tell it to which attractor it should go. Attractors are not actual physical spaces (that become "full" if something is stored there). They are just spaces to separate things visually.
In your process blocks, you probably did not specify the attractors correctly or did not define to move to a random attractor. But even in the latter case, you could have things being stored in the same attractor.
Two options:
- Either, turn your attractors into actual agents with rectangular nodes, that you setup to be "empty/full" with state charts (faster but harder to design)
- Or use the material handling library with its storage system setup, doing this for your (but this is computationally slower)
QUESTION
I am working on a binary analysis project where I am building a lifter that translates assembly to llvm. I built a memory model but a bit confused on how str and ldr arm assembly instructions work on the memory. So my question is. given a memory address 0000b8f0 for example in which I would like to store a 64 bit decimal value of 20000000. does the str instruction store the entire 20000000 in address 0000b8f0 or does it divide it into bytes and stores first byte in 0000b8f0 and 2nd byte in 0000b8f1 and 3rd byte in 0000b8f2 and so on...and same goes for loading from an address (0000b8f0) does the ldr instruction take just the byte stored at 0000b8f0 or the full set of bytes from 0000b8f0-0000b8f4.
sorry if my question is very basic but I need to make sure I correctly implement the effects of the str and ldr on my memory model.
...ANSWER
Answered 2021-Sep-07 at 18:38Logically1, memory is an array of 8-bit bytes.
Word load/stores access more than one byte at once, just like SIMD intrinsics in C, or like the opposite of ((char*)my_int)[2] to load the 3rd byte of an int.
C's memory model was designed around a byte-addressable machine that supports wider accesses (like PDP-11 or ARM), so it's what you're used to if you understand how char* works in C for accessing the object-representation of other objects, e.g. why memcpy works.
(I didn't use a C example of pointing an int* at a char array because the strict-aliasing rule in C makes that undefined behaviour. Only char* is allowed to alias other types in ISO C. Asm has well-defined behaviour for accessing bytes of memory with any width, with any partial or full overlap with earlier stores, as does GNU C when compiled with -fno-strict-aliasing to disable type-based alias analysis / optimization.)
str is a 32-bit word store; it writes all 4 bytes at once. If you were to load from 0000b8f1, ...2, or ...3, you'd get the 2nd, 3rd, or 4th byte, so str is equivalent to 4 separate strb instructions (with shifts to extract the right bytes), except for the obvious lack of atomicity and performance.
str always stores 4 bytes from a 32-bit register. If a register holds a value like 2, that means the upper bytes are all zero.
ARM can be big- or little-endian. I think modern ARM systems are most often little-endian, like x86, so the least-significant byte of a value is stored at the lowest address.
The byte at 0000b8f0 can't hold 20000000 on its own; a byte isn't that large, if that's what you're asking.
Note that 0000b8f4 is the low byte of the next word; it's a 4-byte-aligned address.
Also, storing an int64_t with 20000000 would require two 32-bit stores. e.g. two str instructions, or an ARMv8 stp to do a 64-bit store of a pair of registers, or an stm store-multiple instruction with two registers. Or eight strb byte-store instructions.
Footnote 1: That's from a software PoV, not how memory controllers, data busses, or DRAM chips are physically organized. Or even caches, thus byte stores and sometimes even loads can be less efficient than whole words on ARM, even apart from only moving 1/4 or 1/8th the amount of data as str or stp
QUESTION
I have a class that looks as follows:
...ANSWER
Answered 2021-Sep-20 at 13:23You could pass a null in for bio, or you could make it optional as stated above. bio has to have a value when you create a new instance of the class because that's the way that you've defined the class.
QUESTION
I have some "complex" calculation that I currently do row-by-row and store in a helper column. In the end I simply run a sum on the helper column to calculate the total value of that calculation.
I would like to simply have one field, where I do the calculation of the total value - without needing the helper column.
To be concrete, I am calculating exertion load (XL): http://www.strongur.io/monitoring-training-stress-with-exertion-load/
As input data I get a weight lifter, repetitions performed and how many reps were in the tank until failure (RIR) is reached. I calculate the XL of a set by expanding the reps performed into a range => 3 reps becomes [1,2,3] and then running an ArrayFormula on that range to calculate the distance to failure from the perspective of that rep (rep 1 is further from failure than rep 3) and consequently the XL of that single rep. I then use a sum to calculate the total exertion load of the given set.
Unfortunately, this approach does not scale to the "single field"-solution - as I cannot add another ArrayFormula around it. I am not sure where to go from here - my spreadsheet experience is limited.
I think I am missing something here from a conceptual perspective - I've been doing some googling and have seen matrices mentioned, would that be the right direction for this kind of thing? I would like to avoid having to write a JavaScript function just for this use-case.
Thanks in advance for any tips/pointers! :)
Best Regards, Simon
Sample Spreadsheet: https://docs.google.com/spreadsheets/d/1CNYxsQKo_CUIsstCDbcjoojL6WK46rg9ONybviFxAGs/edit?usp=sharing
...ANSWER
Answered 2021-Jul-16 at 08:38use:
QUESTION
I'm new to Unity and C# in general, so excuse my terminology(or lack thereof)...
I have succeeded -with the help of a friend, to credit where its due- in making a platform go up a certain amount after one frame of collision with the player! The only problem is that, now, I can't seem to get it moving down again... Said friend challenged me to make it go up, stay airborne for a certain amount of time, then go back down.
Here is a snippet of my working code that makes it go up.
...ANSWER
Answered 2021-Apr-17 at 01:49Based on your comment I made a few revisions to make the platform movement a bit smoother. I also made it so the same function can be used for both the upward and downward motion.
QUESTION
Ok, so I am trying to send data to php from javascript and I've been doing it just fine with ints. However, I can't seem to do it with strings.
On the below code, the name, email, company, phone, city, state and country are all string fields. Everything else is an int. The ints are transfering just fine, and I've done an alert on the variables and I know that they are populated with the right data.
(javascript)
Full
...ANSWER
Answered 2021-Mar-02 at 16:50Your javascript object contains capitalized properties, while in your PHP code you are expecting lowercased properties.
Edit your JS code to
QUESTION
Why are my variables being alerted back to me as null?
So, I'm trying to pass a string in a variable back to a main page from an external javascript page via alerts.
At first I thought that the javascript wasn't pulling information from the php page properly, then I tried just typing in a variable directly on the javascript page. Both the pulled information and the information that I described on the javascript directly send null.
Now I know for a fact that the varibles name and email are not null, as I literally just defined them.
Here is the code I am having an issue with.
...ANSWER
Answered 2021-Feb-26 at 21:07.value should not be in the argument to document.getElementById(), it should be used on the result of this.
And you shouldn't call $() or use the # prefix in the argument to getElementById(), the argument should just be the ID by itself.
QUESTION
I am learning React and JavaScript and now I have this CodeSandbox but I can't convert it to JavaScript React I have tried this for the Card Component:
ANSWER
Answered 2021-Jan-24 at 23:04To swap your Code Sandbox from TypeScript to JavaScript you should just need to:
- Remove all typescript specific syntax from your ".ts" and ".tsx" files (interfaces, typings, etc)
- Change all the file extensions to their JavaScript equivalent i.e. ".ts" -> ".js" and ".tsx" -> ".jsx".
- Update the "main" property of the "package.json" file to point to the renamed entry point. i.e. "src/index.jsx".
I created a quick CodeSandbox with this already done.
QUESTION
I am writing a GUI using a camera in kivy, and am unsure why my code is not working. I have a camera feed, and two methods of capturing a picture from it: one triggered by a gpiozero when_pressed callback, and one triggered by a kivy.uix.button on_press callback.
The kivy.uix.button callback succeeds in capturing an image, but the gpiozero callback says Exception: Shader didnt link, check info log., fails to save an image, and then makes the camera feed go black (although images can later still be captured with the successful option). Why does one callback work but not the other?
Here is the related code, and the corresponding terminal outputs. I've annotated the terminal output with # ALL CAPS COMMENTS. (My code is inspired by the kivy docs camera example, which also captures successfully).
ANSWER
Answered 2021-Jan-01 at 02:20...or at least an explanation of why gpiozero when_pressed is not playing nice.
My workaround was to have a private __capture() function, which acts as a wrapper to Clock.schedule_once(self.capture). capture_btn.when_pressed would use this private wrapper callback to avoid calling the problematic code directly, and any other uses of capture() would use the public one as normal since that works fine when not interacting with gpiozero.
main.pyIn the following code I would prefer for
capture()and__capture()to have swapped names since that would fit better with the philosophy of private functions, but unfortunately that's throwingAttributeError: 'RootWidget' object has no attribute '__capture'when I try that and I don't know how to fix that (using_RootWidget__captureisn't helping). The lines commented with##illustrate my preferred but nonfunctional way.
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Install lifter
You can use lifter 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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