dok_matrix: Dictionary of Keys format 6. coo_matrix: COOrdinate format (aka IJV, triplet format) 7. dia_matrix: DIAgonal format 8. spmatrix: Sparse matrix base clas ''' 矩阵属性 from scipy.sparse import csr_matrix ### 共有属性 mat.shape # 矩阵形状 mat.dtype # 数据类型 mat.ndim # ...
There are seven available sparse matrix types:1. csc_matrix: Compressed Sparse Column format2. csr_matrix: Compressed Sparse Row format3.bsr_matrix:BlockSparse Row format4. lil_matrix: List of Lists format5. dok_matrix:Dictionaryof Keys format6. coo_matrix: COOrdinate format (aka IJV, triplet...
Sparse matrices can be used in arithmetic operations: they support addition, subtraction, multiplication, division, and matrix power Advantages of the CSR format efficient arithmetic operations CSR + CSR, CSR * CSR, etc. efficient row slicing fast matrix vector products Disadvantages of the CSR forma...
csr_matrix((data, indices, indptr), [shape=(M, N)]) is the standard CSR representation where the column indices for row i are stored in indices[indptr[i]:indptr[i+1]] and their corresponding values are stored in data[indptr[i]:indptr[i+1]]. If the shape parameter is not supplied,...
Contrary to CUSPARSE which works with common CSR format, our new format requires conversion. However, multiplication of sparse-matrix and vector is significantly faster for many atrices. We demonstrate it on set of 1 600 matrices and we show for what types of matrices our format is profitable....
csr_matrix是按行对矩阵进行压缩的 通过indices,indptr,data来确定矩阵。 data表示矩阵中的非零数据 对于第i行而言,该行中非零元素的列索引为indices[indptr[i]:indptr[i+1]] 可以将indptr理解成利用其自身索引i来指向第i行元素的列索引 根据[indptr[i]:indptr[i+1]],我就得到了该行中的非零元素个数,如...
CSR方法采取按行压缩的方式，使用三个数组表示原始矩阵。首先，数据元素存储在'data'数组中，表示每一行的非零数值。每行的索引则在'indptr'数组中体现，注意，每个值代表该行中的非零元素数量。以矩阵第一行为例，data[ indptr[0]: indptr[1] ]，即data[0:2]，包含数值1和2。接下来，我们需要...
A sparse matrix in COOrdinate format. csc_matrix(arg1[, shape, dtype, copy]) Compressed Sparse Column matrix csr_matrix(arg1[, shape, dtype, copy]) Compressed Sparse Row matrix dia_matrix(arg1[, shape, dtype, copy]) Sparse matrix with DIAgonal storage ...
csr_matrix csr_matrix，全称Compressed Sparse Row matrix，即按行压缩的稀疏矩阵存储方式，由三个...
在探讨CSR矩阵压缩时，我们首先需要理解CSR代表Compressed Sparse Row，即按行压缩矩阵。原矩阵结构直观，便于理解。还原矩阵时，CSR结构发挥关键作用。此结构通过三个数组：indptr, indices和data，高效地存储稀疏矩阵。indptr数组记录了每行首尾非零元素的指针（不含右边界），如同切片操作。取某一行为例，...