CV | Front End Engineer Curriculum Vitae - Front End Interview

The cv-qualifier should always be dropped (both in determining the type of dummyFunc and when substituting the deduced argument into the callFunc signature), and I'm pretty sure all compilers agree on this. It's not really what the question is about. Let's change the example a bit:

Here's a potential approach using traditional image processing:

1. Obtain binary image. We load the image, convert to grayscale, Gaussian blur, then adaptive threshold to obtain a black/white binary image. We then remove small noise using contour area filtering. At this stage we also create two blank masks.

2. Detect horizontal and vertical lines. Now we isolate horizontal lines by creating a horizontal shaped kernel and perform morphological operations. To detect vertical lines, we do the same but with a vertical shaped kernel. We draw the detected lines onto separate masks.

3. Find intersection points. The idea is that if we combine the horizontal and vertical masks, the intersection points will be the corners. We can perform a bitwise-and operation on the two masks. Finally we find the centroid of each intersection point and highlight corners by drawing a circle.

Here's a visualization of the pipeline

Input image -> binary image

Detected horizontal lines -> horizontal mask

Detected vertical lines -> vertical mask

Bitwise-and both masks -> detected intersection points -> corners -> cleaned up corners

The results aren't perfect but it's pretty close. The problem comes from the noise on the vertical mask due to the slanted image. If the image was centered without an angle, the results would be ideal. You can probably fine tune the kernel sizes or iterations to get better results.

Code

This is an overflow bug under the hood of condition_variable::wait_for. Internally it is waiting using steady_clock which counts nanoseconds. This clock overflows at +/-292 years. So when 1000 years gets converted to nanoseconds, it is overflowing.

This looks like a standards bug as opposed to an implementation bug: http://eel.is/c++draft/thread.condition#condvar-24

The implementation should check for overflows of this type and in case found, just wait for the maximum time it is capable of waiting for.

I tried with scikeras but I got errors because it doesn't accept not-numerical inputs (in our case the input is in str format). So I came back to the standard keras wrapper.

The focal point here is that the model is not built correctly. The TextVectorization must be put inside the Sequential model like shown in the official documentation.

So the build_model function becomes:

You end up with the error with precision because some of your penalization is too strong for this model, if you check the results, you get 0 for f1 score when C = 0.001 and C = 0.01

GCC and Clang report that S is trivially copyable in C++11 through C++23 standard modes. MSVC reports that S is not trivially copyable in C++14 through C++20 standard modes.

N3337 (~ C++11) and N4140 (~ C++14) say:

A trivially copyable class is a class that:

• has no non-trivial copy constructors,
• has no non-trivial move constructors,
• has no non-trivial copy assignment operators,
• has no non-trivial move assignment operators, and
• has a trivial destructor.

By this definition, S is trivially copyable.

N4659 (~ C++17) says:

A trivially copyable class is a class:

• where each copy constructor, move constructor, copy assignment operator, and move assignment operator is either deleted or trivial,
• that has at least one non-deleted copy constructor, move constructor, copy assignment operator, or move assignment operator, and
• that has a trivial, non-deleted destructor

By this definition, S is not trivially copyable.

N4860 (~ C++20) says:

A trivially copyable class is a class:

• that has at least one eligible copy constructor, move constructor, copy assignment operator, or move assignment operator,
• where each eligible copy constructor, move constructor, copy assignment operator, and move assignment operator is trivial, and
• that has a trivial, non-deleted destructor.

By this definition, S is not trivially copyable.

Thus, as published, S was trivally copyable in C++11 and C++14, but not in C++17 and C++20.

The change was adopted from DR 1734 in February 2016. Implementors generally treat DRs as though they apply to all prior language standards by convention. Thus, by the published standard for C++11 and C++14, S was trivially copyable, and by convention, newer compiler versions might choose to treat S as not trivially copyable in C++11 and C++14 modes. Thus, all compilers could be said to be correct for C++11 and C++14.

For C++17 and beyond, S is unambiguously not trivially copyable so GCC and Clang are incorrect. This is GCC bug #96288 and LLVM bug #39050

I'm not sure if this is possible if you're linearly scaling the image. However, you could give OpenCV's Contrast Limited Adaptive Histogram Equalization a try:

Here is the benchmarking for the existing to OP's question (borrow test data from @Marek Fiołka but with n <- 10000)

The problem was solved by finding this Github issue: https://github.com/isl-org/Open3D/issues/2286
By using specific build flags when building Open3D, the libraries could both be linked correctly and simultaneously with the target_link_libraries(ORB_SLAM ${OpenCV_LIBS} ${Open3D_LIBRARIES}) command.

The build commands were as follows;