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550 lines
18 KiB
550 lines
18 KiB
"""List of Lists sparse matrix class
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"""
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__docformat__ = "restructuredtext en"
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__all__ = ['lil_matrix', 'isspmatrix_lil']
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from bisect import bisect_left
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import numpy as np
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from .base import spmatrix, isspmatrix
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from ._index import IndexMixin, INT_TYPES, _broadcast_arrays
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from .sputils import (getdtype, isshape, isscalarlike, upcast_scalar,
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get_index_dtype, check_shape, check_reshape_kwargs,
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asmatrix)
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from . import _csparsetools
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class lil_matrix(spmatrix, IndexMixin):
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"""Row-based list of lists sparse matrix
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This is a structure for constructing sparse matrices incrementally.
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Note that inserting a single item can take linear time in the worst case;
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to construct a matrix efficiently, make sure the items are pre-sorted by
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index, per row.
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This can be instantiated in several ways:
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lil_matrix(D)
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with a dense matrix or rank-2 ndarray D
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lil_matrix(S)
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with another sparse matrix S (equivalent to S.tolil())
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lil_matrix((M, N), [dtype])
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to construct an empty matrix with shape (M, N)
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dtype is optional, defaulting to dtype='d'.
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Attributes
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----------
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dtype : dtype
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Data type of the matrix
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shape : 2-tuple
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Shape of the matrix
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ndim : int
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Number of dimensions (this is always 2)
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nnz
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Number of stored values, including explicit zeros
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data
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LIL format data array of the matrix
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rows
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LIL format row index array of the matrix
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Notes
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-----
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Sparse matrices can be used in arithmetic operations: they support
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addition, subtraction, multiplication, division, and matrix power.
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Advantages of the LIL format
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- supports flexible slicing
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- changes to the matrix sparsity structure are efficient
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Disadvantages of the LIL format
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- arithmetic operations LIL + LIL are slow (consider CSR or CSC)
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- slow column slicing (consider CSC)
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- slow matrix vector products (consider CSR or CSC)
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Intended Usage
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- LIL is a convenient format for constructing sparse matrices
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- once a matrix has been constructed, convert to CSR or
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CSC format for fast arithmetic and matrix vector operations
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- consider using the COO format when constructing large matrices
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Data Structure
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- An array (``self.rows``) of rows, each of which is a sorted
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list of column indices of non-zero elements.
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- The corresponding nonzero values are stored in similar
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fashion in ``self.data``.
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"""
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format = 'lil'
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def __init__(self, arg1, shape=None, dtype=None, copy=False):
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spmatrix.__init__(self)
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self.dtype = getdtype(dtype, arg1, default=float)
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# First get the shape
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if isspmatrix(arg1):
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if isspmatrix_lil(arg1) and copy:
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A = arg1.copy()
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else:
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A = arg1.tolil()
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if dtype is not None:
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A = A.astype(dtype, copy=False)
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self._shape = check_shape(A.shape)
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self.dtype = A.dtype
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self.rows = A.rows
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self.data = A.data
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elif isinstance(arg1,tuple):
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if isshape(arg1):
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if shape is not None:
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raise ValueError('invalid use of shape parameter')
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M, N = arg1
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self._shape = check_shape((M, N))
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self.rows = np.empty((M,), dtype=object)
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self.data = np.empty((M,), dtype=object)
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for i in range(M):
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self.rows[i] = []
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self.data[i] = []
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else:
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raise TypeError('unrecognized lil_matrix constructor usage')
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else:
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# assume A is dense
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try:
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A = asmatrix(arg1)
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except TypeError:
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raise TypeError('unsupported matrix type')
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else:
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from .csr import csr_matrix
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A = csr_matrix(A, dtype=dtype).tolil()
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self._shape = check_shape(A.shape)
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self.dtype = A.dtype
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self.rows = A.rows
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self.data = A.data
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def __iadd__(self,other):
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self[:,:] = self + other
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return self
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def __isub__(self,other):
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self[:,:] = self - other
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return self
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def __imul__(self,other):
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if isscalarlike(other):
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self[:,:] = self * other
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return self
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else:
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return NotImplemented
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def __itruediv__(self,other):
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if isscalarlike(other):
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self[:,:] = self / other
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return self
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else:
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return NotImplemented
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# Whenever the dimensions change, empty lists should be created for each
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# row
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def getnnz(self, axis=None):
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if axis is None:
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return sum([len(rowvals) for rowvals in self.data])
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if axis < 0:
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axis += 2
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if axis == 0:
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out = np.zeros(self.shape[1], dtype=np.intp)
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for row in self.rows:
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out[row] += 1
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return out
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elif axis == 1:
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return np.array([len(rowvals) for rowvals in self.data], dtype=np.intp)
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else:
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raise ValueError('axis out of bounds')
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def count_nonzero(self):
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return sum(np.count_nonzero(rowvals) for rowvals in self.data)
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getnnz.__doc__ = spmatrix.getnnz.__doc__
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count_nonzero.__doc__ = spmatrix.count_nonzero.__doc__
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def __str__(self):
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val = ''
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for i, row in enumerate(self.rows):
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for pos, j in enumerate(row):
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val += " %s\t%s\n" % (str((i, j)), str(self.data[i][pos]))
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return val[:-1]
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def getrowview(self, i):
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"""Returns a view of the 'i'th row (without copying).
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"""
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new = lil_matrix((1, self.shape[1]), dtype=self.dtype)
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new.rows[0] = self.rows[i]
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new.data[0] = self.data[i]
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return new
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def getrow(self, i):
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"""Returns a copy of the 'i'th row.
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"""
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M, N = self.shape
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if i < 0:
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i += M
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if i < 0 or i >= M:
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raise IndexError('row index out of bounds')
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new = lil_matrix((1, N), dtype=self.dtype)
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new.rows[0] = self.rows[i][:]
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new.data[0] = self.data[i][:]
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return new
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def __getitem__(self, key):
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# Fast path for simple (int, int) indexing.
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if (isinstance(key, tuple) and len(key) == 2 and
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isinstance(key[0], INT_TYPES) and
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isinstance(key[1], INT_TYPES)):
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# lil_get1 handles validation for us.
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return self._get_intXint(*key)
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# Everything else takes the normal path.
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return IndexMixin.__getitem__(self, key)
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def _asindices(self, idx, N):
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# LIL routines handle bounds-checking for us, so don't do it here.
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try:
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x = np.asarray(idx)
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except (ValueError, TypeError, MemoryError):
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raise IndexError('invalid index')
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if x.ndim not in (1, 2):
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raise IndexError('Index dimension must be <= 2')
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return x
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def _get_intXint(self, row, col):
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v = _csparsetools.lil_get1(self.shape[0], self.shape[1], self.rows,
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self.data, row, col)
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return self.dtype.type(v)
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def _get_sliceXint(self, row, col):
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row = range(*row.indices(self.shape[0]))
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return self._get_row_ranges(row, slice(col, col+1))
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def _get_arrayXint(self, row, col):
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return self._get_row_ranges(row, slice(col, col+1))
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def _get_intXslice(self, row, col):
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return self._get_row_ranges((row,), col)
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def _get_sliceXslice(self, row, col):
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row = range(*row.indices(self.shape[0]))
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return self._get_row_ranges(row, col)
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def _get_arrayXslice(self, row, col):
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return self._get_row_ranges(row, col)
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def _get_intXarray(self, row, col):
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row = np.array(row, dtype=col.dtype, ndmin=1)
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return self._get_columnXarray(row, col)
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def _get_sliceXarray(self, row, col):
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row = np.arange(*row.indices(self.shape[0]))
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return self._get_columnXarray(row, col)
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def _get_columnXarray(self, row, col):
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# outer indexing
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row, col = _broadcast_arrays(row[:,None], col)
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return self._get_arrayXarray(row, col)
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def _get_arrayXarray(self, row, col):
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# inner indexing
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i, j = map(np.atleast_2d, _prepare_index_for_memoryview(row, col))
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new = lil_matrix(i.shape, dtype=self.dtype)
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_csparsetools.lil_fancy_get(self.shape[0], self.shape[1],
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self.rows, self.data,
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new.rows, new.data,
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i, j)
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return new
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def _get_row_ranges(self, rows, col_slice):
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"""
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Fast path for indexing in the case where column index is slice.
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This gains performance improvement over brute force by more
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efficient skipping of zeros, by accessing the elements
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column-wise in order.
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Parameters
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----------
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rows : sequence or range
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Rows indexed. If range, must be within valid bounds.
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col_slice : slice
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Columns indexed
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"""
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j_start, j_stop, j_stride = col_slice.indices(self.shape[1])
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col_range = range(j_start, j_stop, j_stride)
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nj = len(col_range)
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new = lil_matrix((len(rows), nj), dtype=self.dtype)
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_csparsetools.lil_get_row_ranges(self.shape[0], self.shape[1],
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self.rows, self.data,
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new.rows, new.data,
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rows,
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j_start, j_stop, j_stride, nj)
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return new
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def _set_intXint(self, row, col, x):
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_csparsetools.lil_insert(self.shape[0], self.shape[1], self.rows,
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self.data, row, col, x)
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def _set_arrayXarray(self, row, col, x):
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i, j, x = map(np.atleast_2d, _prepare_index_for_memoryview(row, col, x))
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_csparsetools.lil_fancy_set(self.shape[0], self.shape[1],
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self.rows, self.data,
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i, j, x)
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def _set_arrayXarray_sparse(self, row, col, x):
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# Special case: full matrix assignment
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if (x.shape == self.shape and
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isinstance(row, slice) and row == slice(None) and
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isinstance(col, slice) and col == slice(None)):
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x = lil_matrix(x, dtype=self.dtype)
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self.rows = x.rows
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self.data = x.data
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return
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# Fall back to densifying x
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x = np.asarray(x.toarray(), dtype=self.dtype)
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x, _ = _broadcast_arrays(x, row)
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self._set_arrayXarray(row, col, x)
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def __setitem__(self, key, x):
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# Fast path for simple (int, int) indexing.
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if (isinstance(key, tuple) and len(key) == 2 and
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isinstance(key[0], INT_TYPES) and
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isinstance(key[1], INT_TYPES)):
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x = self.dtype.type(x)
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if x.size > 1:
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raise ValueError("Trying to assign a sequence to an item")
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return self._set_intXint(key[0], key[1], x)
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# Everything else takes the normal path.
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IndexMixin.__setitem__(self, key, x)
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def _mul_scalar(self, other):
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if other == 0:
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# Multiply by zero: return the zero matrix
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new = lil_matrix(self.shape, dtype=self.dtype)
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else:
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res_dtype = upcast_scalar(self.dtype, other)
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new = self.copy()
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new = new.astype(res_dtype)
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# Multiply this scalar by every element.
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for j, rowvals in enumerate(new.data):
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new.data[j] = [val*other for val in rowvals]
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return new
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def __truediv__(self, other): # self / other
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if isscalarlike(other):
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new = self.copy()
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# Divide every element by this scalar
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for j, rowvals in enumerate(new.data):
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new.data[j] = [val/other for val in rowvals]
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return new
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else:
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return self.tocsr() / other
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def copy(self):
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M, N = self.shape
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new = lil_matrix(self.shape, dtype=self.dtype)
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# This is ~14x faster than calling deepcopy() on rows and data.
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_csparsetools.lil_get_row_ranges(M, N, self.rows, self.data,
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new.rows, new.data, range(M),
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0, N, 1, N)
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return new
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copy.__doc__ = spmatrix.copy.__doc__
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def reshape(self, *args, **kwargs):
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shape = check_shape(args, self.shape)
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order, copy = check_reshape_kwargs(kwargs)
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# Return early if reshape is not required
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if shape == self.shape:
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if copy:
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return self.copy()
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else:
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return self
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new = lil_matrix(shape, dtype=self.dtype)
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if order == 'C':
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ncols = self.shape[1]
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for i, row in enumerate(self.rows):
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for col, j in enumerate(row):
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new_r, new_c = np.unravel_index(i * ncols + j, shape)
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new[new_r, new_c] = self[i, j]
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elif order == 'F':
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nrows = self.shape[0]
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for i, row in enumerate(self.rows):
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for col, j in enumerate(row):
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new_r, new_c = np.unravel_index(i + j * nrows, shape, order)
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new[new_r, new_c] = self[i, j]
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else:
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raise ValueError("'order' must be 'C' or 'F'")
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return new
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reshape.__doc__ = spmatrix.reshape.__doc__
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def resize(self, *shape):
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shape = check_shape(shape)
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new_M, new_N = shape
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M, N = self.shape
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if new_M < M:
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self.rows = self.rows[:new_M]
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self.data = self.data[:new_M]
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elif new_M > M:
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self.rows = np.resize(self.rows, new_M)
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self.data = np.resize(self.data, new_M)
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for i in range(M, new_M):
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self.rows[i] = []
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self.data[i] = []
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if new_N < N:
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for row, data in zip(self.rows, self.data):
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trunc = bisect_left(row, new_N)
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del row[trunc:]
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del data[trunc:]
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self._shape = shape
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resize.__doc__ = spmatrix.resize.__doc__
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def toarray(self, order=None, out=None):
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d = self._process_toarray_args(order, out)
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for i, row in enumerate(self.rows):
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for pos, j in enumerate(row):
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d[i, j] = self.data[i][pos]
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return d
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toarray.__doc__ = spmatrix.toarray.__doc__
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def transpose(self, axes=None, copy=False):
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return self.tocsr(copy=copy).transpose(axes=axes, copy=False).tolil(copy=False)
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transpose.__doc__ = spmatrix.transpose.__doc__
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def tolil(self, copy=False):
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if copy:
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return self.copy()
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else:
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return self
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tolil.__doc__ = spmatrix.tolil.__doc__
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def tocsr(self, copy=False):
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from .csr import csr_matrix
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M, N = self.shape
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if M == 0 or N == 0:
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return csr_matrix((M, N), dtype=self.dtype)
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# construct indptr array
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if M*N <= np.iinfo(np.int32).max:
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# fast path: it is known that 64-bit indexing will not be needed.
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idx_dtype = np.int32
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indptr = np.empty(M + 1, dtype=idx_dtype)
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indptr[0] = 0
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_csparsetools.lil_get_lengths(self.rows, indptr[1:])
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np.cumsum(indptr, out=indptr)
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nnz = indptr[-1]
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else:
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idx_dtype = get_index_dtype(maxval=N)
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lengths = np.empty(M, dtype=idx_dtype)
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_csparsetools.lil_get_lengths(self.rows, lengths)
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nnz = lengths.sum()
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idx_dtype = get_index_dtype(maxval=max(N, nnz))
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indptr = np.empty(M + 1, dtype=idx_dtype)
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indptr[0] = 0
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np.cumsum(lengths, dtype=idx_dtype, out=indptr[1:])
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indices = np.empty(nnz, dtype=idx_dtype)
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data = np.empty(nnz, dtype=self.dtype)
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_csparsetools.lil_flatten_to_array(self.rows, indices)
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_csparsetools.lil_flatten_to_array(self.data, data)
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# init csr matrix
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return csr_matrix((data, indices, indptr), shape=self.shape)
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tocsr.__doc__ = spmatrix.tocsr.__doc__
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def _prepare_index_for_memoryview(i, j, x=None):
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"""
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Convert index and data arrays to form suitable for passing to the
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Cython fancy getset routines.
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The conversions are necessary since to (i) ensure the integer
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index arrays are in one of the accepted types, and (ii) to ensure
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the arrays are writable so that Cython memoryview support doesn't
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choke on them.
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Parameters
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----------
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i, j
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Index arrays
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x : optional
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Data arrays
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Returns
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-------
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i, j, x
|
|
Re-formatted arrays (x is omitted, if input was None)
|
|
|
|
"""
|
|
if i.dtype > j.dtype:
|
|
j = j.astype(i.dtype)
|
|
elif i.dtype < j.dtype:
|
|
i = i.astype(j.dtype)
|
|
|
|
if not i.flags.writeable or i.dtype not in (np.int32, np.int64):
|
|
i = i.astype(np.intp)
|
|
if not j.flags.writeable or j.dtype not in (np.int32, np.int64):
|
|
j = j.astype(np.intp)
|
|
|
|
if x is not None:
|
|
if not x.flags.writeable:
|
|
x = x.copy()
|
|
return i, j, x
|
|
else:
|
|
return i, j
|
|
|
|
|
|
def isspmatrix_lil(x):
|
|
"""Is x of lil_matrix type?
|
|
|
|
Parameters
|
|
----------
|
|
x
|
|
object to check for being a lil matrix
|
|
|
|
Returns
|
|
-------
|
|
bool
|
|
True if x is a lil matrix, False otherwise
|
|
|
|
Examples
|
|
--------
|
|
>>> from scipy.sparse import lil_matrix, isspmatrix_lil
|
|
>>> isspmatrix_lil(lil_matrix([[5]]))
|
|
True
|
|
|
|
>>> from scipy.sparse import lil_matrix, csr_matrix, isspmatrix_lil
|
|
>>> isspmatrix_lil(csr_matrix([[5]]))
|
|
False
|
|
"""
|
|
return isinstance(x, lil_matrix)
|
|
|