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全部文章（共18篇）

题解 | 多项式特征的Phi变换

import numpy as np def phi_transform(data: list[float], degree: int) -> list[list[float]]: """ Perform a Phi Transformation to ma...

2026-04-19

0 19

题解 | 描述性统计计算器

from os import stat_result import numpy as np def descriptive_statistics(data): # Your code here data=np.array(data) mean=np.mean(data) ...

2026-04-19

0 18

题解 | 计算向量之间的余弦相似度

import numpy as np def cosine_similarity(v1, v2): # Implement your code here v1=np.array(v1) v2=np.array(v2) dot=v1.dot(v2) norm_v1=...

2026-04-19

0 17

题解 | 实现压缩列稀疏矩阵

from scipy.sparse import csc_matrix def compressed_col_sparse_matrix(dense_matrix): csc=csc_matrix(dense_matrix) return csc.data.tolist(),cs...

2026-04-19

0 15

题解 | 实现向量到直线的正交投影

import numpy as np def orthogonal_projection(v, L): v=np.array(v) L=np.array(L) vl=v.dot(L) l2=L.dot(L) scalar=vl/l2 projL=sca...

2026-04-19

0 17

题解 | 实现压缩行稀疏矩阵（CSR）格式转换

# def compressed_row_sparse_matrix(dense_matrix): # vals=[] # col_idx=[] # row_ptr=[0] # for row in dense_matrix: # for col,va...

2026-04-19

0 15

题解 | 实现压缩行稀疏矩阵（CSR）格式转换

def compressed_row_sparse_matrix(dense_matrix): vals=[] col_idx=[] row_ptr=[0] for row in dense_matrix: for col,val in enumera...

2026-04-19

0 14

题解 | 基向量变换矩阵

import numpy as np def transform_basis(B, C): C_inv=np.linalg.inv(C) result=C_inv.dot(B) return result.tolist() if __name__ == "__main__&qu...

2026-04-19

0 15

题解 | 矩阵和向量的点积

import numpy as np def matrix_vector_dot_product(matrix, vector): # 补全代码 matrix=np.array(matrix) vector=np.array(vector) if matrix.sha...

2026-04-18

0 18

题解 | 统计复旦用户8月练题情况

select u.device_id,university, sum(if(result is null,0,1)) question_cnt, sum(if(result='right',1,0)) right_question_cnt from user_profile u left join ...

2026-03-29

0 29