Example #1
0
 def __init__(self,size=0,dim=0,ldb=None):
     """
     Initializes class with ListDB structure
     """
     self._inverted=False
     self._original=None
     if ldb:
         self.ldb=ldb
     else:
         self.ldb = la.listdb_create(size,dim)
Example #2
0
def ndarray_to_listdb(arr):
    """
    Converts a numpy multidimensional array to a ListDB structure
    """
    if issubclass(arr.dtype.type,np.integer):
        factor=1
    else:
        factor= 100000000
    ldb = la.listdb_create(arr.shape[0], arr.shape[1])
    for i,row in enumerate(arr):
        for j,item in enumerate(row):
            if item != 0:
                ldb.push(int(i), int(j), int(round(item * factor)))
    return L1LSH(ldb=ldb)
Example #3
0
def csr_to_listdb(csr):
    """
    Converts a Compressed Sparse Row (CSR) matrix to a ListDB structure
    """
    if issubclass(csr.dtype.type,np.integer):
        factor=1
    else:
        factor= 100000000
 
    ldb = la.listdb_create(csr.shape[0], csr.shape[1])
    coo = csr.tocoo()    
    for i,j,v in itertools.izip(coo.row, coo.col, coo.data):
        ldb.push(int(i), int(j), int(round(v * factor)))

    return L1LSH(ldb=ldb)