Unverified50% confidenceFactExact time
高维空间中随着维度增加，随机向量之间的夹角趋向集中在90°附近，极端值1或-1概率趋近于零
1
Sources
50%
Confidence
Long-term
Relevance
7/14/2026
First Seen
Sources
余弦相似度-1代表语义相反？机器学习面试高频陷阱解析
Related Claims
UnverifiedWhen two unit vectors are randomly sampled in d-dimensional space, their inner product has an expected value of 0 and a standard deviation of approximately 1/√d; when d=1024, the standard deviation is approximately 0.031.73% similarUnverified1个基点等于0.01个百分点61% similarUnverified同一成年人在20米高度时约占图像面积的0.1%，而在80米高度时可能降至0.006%58% similarUnverified1个基点等于0.01个百分点，500个基点即利率上升5个百分点58% similarUnverifiedAI模型给出候选结果：将黎曼zeta函数零点中位于临界线上且为单零点的比例下界从Anthropic的67.250070%提升到约67.25214%58% similar
Cite This Claim
Stable URI
https://kongchang.com/claim/507869API
curl https://kongchang.com/api/v1/knowledge/claims/507869MCP
get_claim(id=507869)