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Python numpy.byte_bounds方法代碼示例

本文整理匯總了Python中numpy.byte_bounds方法的典型用法代碼示例。如果您正苦於以下問題:Python numpy.byte_bounds方法的具體用法?Python numpy.byte_bounds怎麽用?Python numpy.byte_bounds使用的例子?那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在numpy的用法示例。


在下文中一共展示了numpy.byte_bounds方法的4個代碼示例,這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚,您的評價將有助於係統推薦出更棒的Python代碼示例。

示例1: _reduce_memmap_backed

# 需要導入模塊: import numpy [as 別名]
# 或者: from numpy import byte_bounds [as 別名]
def _reduce_memmap_backed(a, m):
    """Pickling reduction for memmap backed arrays.

    a is expected to be an instance of np.ndarray (or np.memmap)
    m is expected to be an instance of np.memmap on the top of the ``base``
    attribute ancestry of a. ``m.base`` should be the real python mmap object.
    """
    # offset that comes from the striding differences between a and m
    a_start, a_end = np.byte_bounds(a)
    m_start = np.byte_bounds(m)[0]
    offset = a_start - m_start

    # offset from the backing memmap
    offset += m.offset

    if m.flags['F_CONTIGUOUS']:
        order = 'F'
    else:
        # The backing memmap buffer is necessarily contiguous hence C if not
        # Fortran
        order = 'C'

    if a.flags['F_CONTIGUOUS'] or a.flags['C_CONTIGUOUS']:
        # If the array is a contiguous view, no need to pass the strides
        strides = None
        total_buffer_len = None
    else:
        # Compute the total number of items to map from which the strided
        # view will be extracted.
        strides = a.strides
        total_buffer_len = (a_end - a_start) // a.itemsize
    return (_strided_from_memmap,
            (m.filename, a.dtype, m.mode, offset, order, a.shape, strides,
             total_buffer_len)) 
開發者ID:flennerhag,項目名稱:mlens,代碼行數:36,代碼來源:pool.py

示例2: _reduce_memmap_backed

# 需要導入模塊: import numpy [as 別名]
# 或者: from numpy import byte_bounds [as 別名]
def _reduce_memmap_backed(a, m):
    """Pickling reduction for memmap backed arrays

    a is expected to be an instance of np.ndarray (or np.memmap)
    m is expected to be an instance of np.memmap on the top of the ``base``
    attribute ancestry of a. ``m.base`` should be the real python mmap object.
    """
    # offset that comes from the striding differences between a and m
    a_start, a_end = np.byte_bounds(a)
    m_start = np.byte_bounds(m)[0]
    offset = a_start - m_start

    # offset from the backing memmap
    offset += m.offset

    if m.flags['F_CONTIGUOUS']:
        order = 'F'
    else:
        # The backing memmap buffer is necessarily contiguous hence C if not
        # Fortran
        order = 'C'

    if a.flags['F_CONTIGUOUS'] or a.flags['C_CONTIGUOUS']:
        # If the array is a contiguous view, no need to pass the strides
        strides = None
        total_buffer_len = None
    else:
        # Compute the total number of items to map from which the strided
        # view will be extracted.
        strides = a.strides
        total_buffer_len = (a_end - a_start) // a.itemsize
    return (_strided_from_memmap,
            (m.filename, a.dtype, m.mode, offset, order, a.shape, strides,
             total_buffer_len)) 
開發者ID:jtamames,項目名稱:SqueezeMeta,代碼行數:36,代碼來源:pool.py

示例3: byte_bounds

# 需要導入模塊: import numpy [as 別名]
# 或者: from numpy import byte_bounds [as 別名]
def byte_bounds(a):
    """
    Returns pointers to the end-points of an array.

    Parameters
    ----------
    a : ndarray
        Input array. It must conform to the Python-side of the array
        interface.

    Returns
    -------
    (low, high) : tuple of 2 integers
        The first integer is the first byte of the array, the second
        integer is just past the last byte of the array.  If `a` is not
        contiguous it will not use every byte between the (`low`, `high`)
        values.

    Examples
    --------
    >>> I = np.eye(2, dtype='f'); I.dtype
    dtype('float32')
    >>> low, high = np.byte_bounds(I)
    >>> high - low == I.size*I.itemsize
    True
    >>> I = np.eye(2, dtype='G'); I.dtype
    dtype('complex192')
    >>> low, high = np.byte_bounds(I)
    >>> high - low == I.size*I.itemsize
    True

    """
    ai = a.__array_interface__
    a_data = ai['data'][0]
    astrides = ai['strides']
    ashape = ai['shape']
    bytes_a = asarray(a).dtype.itemsize

    a_low = a_high = a_data
    if astrides is None:
        # contiguous case
        a_high += a.size * bytes_a
    else:
        for shape, stride in zip(ashape, astrides):
            if stride < 0:
                a_low += (shape-1)*stride
            else:
                a_high += (shape-1)*stride
        a_high += bytes_a
    return a_low, a_high


#-----------------------------------------------------------------------------
# Function for output and information on the variables used.
#----------------------------------------------------------------------------- 
開發者ID:Frank-qlu,項目名稱:recruit,代碼行數:57,代碼來源:utils.py

示例4: byte_bounds

# 需要導入模塊: import numpy [as 別名]
# 或者: from numpy import byte_bounds [as 別名]
def byte_bounds(a):
    """
    Returns pointers to the end-points of an array.

    Parameters
    ----------
    a : ndarray
        Input array. It must conform to the Python-side of the array interface.

    Returns
    -------
    (low, high) : tuple of 2 integers
        The first integer is the first byte of the array, the second integer is
        just past the last byte of the array.  If `a` is not contiguous it
        will not use every byte between the (`low`, `high`) values.

    Examples
    --------
    >>> I = np.eye(2, dtype='f'); I.dtype
    dtype('float32')
    >>> low, high = np.byte_bounds(I)
    >>> high - low == I.size*I.itemsize
    True
    >>> I = np.eye(2, dtype='G'); I.dtype
    dtype('complex192')
    >>> low, high = np.byte_bounds(I)
    >>> high - low == I.size*I.itemsize
    True

    """
    ai = a.__array_interface__
    a_data = ai['data'][0]
    astrides = ai['strides']
    ashape = ai['shape']
    bytes_a = int(ai['typestr'][2:])

    a_low = a_high = a_data
    if astrides is None: # contiguous case
        a_high += a.size * bytes_a
    else:
        for shape, stride in zip(ashape, astrides):
            if stride < 0:
                a_low += (shape-1)*stride
            else:
                a_high += (shape-1)*stride
        a_high += bytes_a
    return a_low, a_high


#-----------------------------------------------------------------------------
# Function for output and information on the variables used.
#----------------------------------------------------------------------------- 
開發者ID:ktraunmueller,項目名稱:Computable,代碼行數:54,代碼來源:utils.py


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