Mastering Huawei Cloud Robot Hackathon: Essential FAQs and Tips for Success

When thinking of robots, people often imagine futuristic quadruped machines or wearable exoskeletons, but in reality robots already deliver significant commercial value across many fields, and Huawei Cloud is working to bring new opportunities to the robot industry through cloud‑assisted solutions.

CodeCraft Cloud Pioneer Hackathon Officially Starts! The competition abstracts real robot business challenges from Huawei Cloud Intelligence; participants control robots via code to achieve the best path‑planning solutions.

Platform Operation Guide

Q: How can I determine if my program experiences frame skips?

Check the judge logs for the entry "player skipped frames: xxx".

Watch the replay and click the eye‑icon button to display debugging information, which also works after submission.

In code, monitor the frame IDs; continuous IDs indicate no skips, while gaps indicate skips.

Q: Why do local execution results differ significantly from the platform results?

The platform uses a different random seed. Although the seed only affects about one ten‑thousandth of the robot parameters, it can cause noticeable differences if the algorithm itself is highly stochastic, such as lacking obstacle‑avoidance logic or making arbitrary task‑selection decisions.

Hardware differences may cause frame skips on the server that did not occur locally. Check the replay for skipped frames to decide whether performance redundancy is needed.

Q: Will the same code produce identical results after submission?

Because the platform uses a fixed random seed, the same code generally yields the same result. Differences may arise from:

Frame skips occurring at different points.

Random factors within the code itself producing different command sequences.

Q: Can you provide an exact physical prediction algorithm?

No. Real‑world scenarios contain many variable environmental factors, making precise prediction impossible. The competition does not provide environment parameters such as drag or elasticity.

Q: What does the log message "Read inf('INF') from player..." mean?

The program output an illegal floating‑point value (INF or NAN). This usually stems from division by zero, invalid arguments to trigonometric functions, or using uninitialized variables.

Q: Are the physics engines consistent across different maps?

The physics engine is identical for all maps; only the random seed differs, affecting robot parameters by roughly one ten‑thousandth. Identical command sequences therefore show only minute differences that can accumulate over time.

Q: Why introduce a random‑seed setting?

The seed prevents participants from simply submitting a pre‑computed command table. Its impact is intentionally minimal, allowing contestants to ignore it while ensuring fairness and preventing cheating through log extraction.

Q: Could one infer the official random seed by manipulating replay data?

The platform implements two distinct random‑seed algorithms (platform version and user version) that keep results within a ten‑thousandth range, making it practically impossible to reconstruct the official seed.

Q: Is there any way to obtain logs from the online execution?

No. For security and fairness, logs are not exposed to participants.

Development Related

Q: Why does my locally compiled program show compilation errors after submission?

Possible reasons include:

Compiler differences (e.g., VS includes headers automatically while GCC does not). Use GCC or MinGW‑w64 for consistency.

Operating‑system differences; the platform runs on Linux.

Modified CMakeLists.txt – the platform replaces it with the original SDK version.

Incorrect directory structure; source files and CMakeLists.txt must reside at the archive root.

Missing CMakeLists.txt in C/C++ submissions.

Java submissions must target JDK 1.8 and cannot access the network.

The Main.java file name and package path must remain unchanged.

Q: Why does my locally running program show runtime errors after submission?

Possible causes:

Attempting to write files without write permissions.

Memory exceeding the 3.8 GB limit, causing the system to kill the process.

Referencing external files (data tables, shared libraries, executables) that are not included in the final binary.

Invoking privileged operations without root rights.

Python version mismatches or usage of non‑standard libraries.

Network access attempts, which are blocked.

Q: My robot receives control commands but does not move. Why?

Most often the output buffer is not flushed after printing OK. Use fflush(stdout) or cout<<flush in C/C++, System.out.flush() in Java, or sys.stdout.flush() in Python.

Q: Why are participants not allowed to modify the CMake file?

For security and fairness. CMake can execute arbitrary commands, which could be abused to gain an advantage or bypass code review. The platform always uses the original CMake configuration.

Q: How to use SSE/AVX/BMI instructions in C/C++?

Enable them via compiler flags, e.g., add #pragma GCC target("avx") in the source code.

Competition Related

Q: Does submitting the SDK's default code earn points?

Yes, it receives the initial score.

Q: Will the platform compile a Release version for execution?

Yes.

Q: Will the ladder‑match (tianTi) problems change?

The ladder and ranked matches use the same problem but different maps. Optimize your code in practice matches, but avoid over‑fitting to specific maps because ladder matches will rotate all maps.

Q: Will the ladder‑match maps be released?

They will be disclosed at the start of the ladder match.

Q: Is performance a key evaluation factor this year? Is Python friendly?

Performance is not directly scored, but higher FPS allows finer control and can indirectly improve results. If you already achieve the maximum 50 FPS, further gains have no benefit. Python is supported; a demo implementation shows it can solve the task.

Q: How to download competition replays?

The feature was not implemented in time, so there is no direct download button. Use the browser's developer tools (F12), open the Network tab, start capture, click the video, and extract the replay file URL from the captured requests.