StreamingDiskANN index build-time parameters

These parameters can be set when an index is created.

Parameter name	Description	Default value
storage_layout	memory_optimized which uses SBQ to compress vector data or plain which stores data uncompressed	memory_optimized
num_neighbors	Sets the maximum number of neighbors per node. Higher values increase accuracy but make the graph traversal slower.	50
search_list_size	This is the S parameter used in the greedy search algorithm used during construction. Higher values improve graph quality at the cost of slower index builds.	100
max_alpha	Is the alpha parameter in the algorithm. Higher values improve graph quality at the cost of slower index builds.	1.2
num_dimensions	The number of dimensions to index. By default, all dimensions are indexed. But you can also index less dimensions to make use of Matryoshka embeddings	0 (all dimensions)
num_bits_per_dimension	Number of bits used to encode each dimension when using SBQ	2 for less than 900 dimensions, 1 otherwise

An example of how to set the num_neighbors parameter is: