There is a duplicated key MCI/WUFUFILTER_5M/FILTER_TOP20/L160_SEED3600 in this file. The first definition is on line 51. This second definition will overwrite the first one, which is likely not the intended behavior. Please ensure all test case keys are unique.

This configuration file has a significant amount of duplication across different test cases (e.g., HGRAPH/*, MCI/*, HYBRID*/*). Using YAML anchors and aliases would make this file much more concise and easier to maintain. You could define a base template for each index type and then merge and override specific parameters for each test case.

The variables n, ids, and data are used in this code snippet but are not defined. For clarity and to make the example easier to use, please consider adding their definitions, for example:

int64_t n = 10000;
std::vector<int64_t> ids(n);
std::vector<float> data(n * 128);
// ... populate ids and data ...

The variable q is used here but not defined. Please add its definition to make the example complete, for instance:

std::vector<float> q(128);
// ... populate query vector q ...

代码示例中的 n、ids 和 data 变量未定义。为了让示例更清晰、更易于使用，请考虑添加它们的定义，例如：

int64_t n = 10000;
std::vector<int64_t> ids(n);
std::vector<float> data(n * 128);
// ... 填充 ids 和 data ...

代码示例中的 q 变量未定义。请添加其定义以使示例完整，例如：

std::vector<float> q(128);
// ... 填充查询向量 q ...

Using std::getenv can introduce issues with thread safety and reliance on global environment state. It would be more robust to control this behavior through a parameter in the build configuration rather than an environment variable.

Directly writing to std::cerr is generally discouraged in a library. It's better to use the project's logging framework (e.g., logger::info or logger::debug) to output these build statistics. This allows users of the library to control log levels and destinations. This also applies to lines 1352-1364.

This check prevents limited_size from being 0. However, a limited_size of 0 could be a valid use case for a range search if the user wants to get search statistics without retrieving any results. The current implementation seems to handle a size-0 heap correctly. Consider removing this check to allow for this possibility.

This block of code to create the result dataset from the heap is duplicated in the k-NN search path (lines 1739-1745). To avoid code duplication, consider extracting this logic into a private helper function.