Python numpy.byte方法代码示例

# 需要导入模块: import numpy [as 别名]
# 或者: from numpy import byte [as 别名]
def _unsigned_subtract(a, b):
    """
    Subtract two values where a >= b, and produce an unsigned result

    This is needed when finding the difference between the upper and lower
    bound of an int16 histogram
    """
    # coerce to a single type
    signed_to_unsigned = {
        np.byte: np.ubyte,
        np.short: np.ushort,
        np.intc: np.uintc,
        np.int_: np.uint,
        np.longlong: np.ulonglong
    }
    dt = np.result_type(a, b)
    try:
        dt = signed_to_unsigned[dt.type]
    except KeyError:
        return np.subtract(a, b, dtype=dt)
    else:
        # we know the inputs are integers, and we are deliberately casting
        # signed to unsigned
        return np.subtract(a, b, casting='unsafe', dtype=dt) 

# 需要导入模块: import numpy [as 别名]
# 或者: from numpy import byte [as 别名]
def _test_type_repr(self, t):
        finfo = np.finfo(t)
        last_fraction_bit_idx = finfo.nexp + finfo.nmant
        last_exponent_bit_idx = finfo.nexp
        storage_bytes = np.dtype(t).itemsize*8
        # could add some more types to the list below
        for which in ['small denorm', 'small norm']:
            # Values from https://en.wikipedia.org/wiki/IEEE_754
            constr = np.array([0x00]*storage_bytes, dtype=np.uint8)
            if which == 'small denorm':
                byte = last_fraction_bit_idx // 8
                bytebit = 7-(last_fraction_bit_idx % 8)
                constr[byte] = 1 << bytebit
            elif which == 'small norm':
                byte = last_exponent_bit_idx // 8
                bytebit = 7-(last_exponent_bit_idx % 8)
                constr[byte] = 1 << bytebit
            else:
                raise ValueError('hmm')
            val = constr.view(t)[0]
            val_repr = repr(val)
            val2 = t(eval(val_repr))
            if not (val2 == 0 and val < 1e-100):
                assert_equal(val, val2) 

# 需要导入模块: import numpy [as 别名]
# 或者: from numpy import byte [as 别名]
def invert(data):
    """
    Inverts the byte data it received utilizing an XOR operation.

    :param data: A chunk of byte data
    :return inverted: The same size of chunked data inverted bitwise
    """

    # Convert the bytestring into an integer
    intwave = np.fromstring(data, np.int32)
    # Invert the integer
    intwave = np.invert(intwave)
    # Convert the integer back into a bytestring
    inverted = np.frombuffer(intwave, np.byte)
    # Return the inverted audio data
    return inverted 

# 需要导入模块: import numpy [as 别名]
# 或者: from numpy import byte [as 别名]
def mix_samples(sample_1, sample_2, ratio):
    """
    Mixes two samples into each other

    :param sample_1: A bytestring containing the first audio source
    :param sample_2: A bytestring containing the second audio source
    :param ratio: A float which determines the mix-ratio of the two samples (the higher, the louder the first sample)
    :return mix: A bytestring containing the two samples mixed together
    """

    # Calculate the actual ratios based on the float the function received
    (ratio_1, ratio_2) = get_ratios(ratio)
    # Convert the two samples to integers
    intwave_sample_1 = np.fromstring(sample_1, np.int16)
    intwave_sample_2 = np.fromstring(sample_2, np.int16)
    # Mix the two samples together based on the calculated ratios
    intwave_mix = (intwave_sample_1 * ratio_1 + intwave_sample_2 * ratio_2).astype(np.int16)
    # Convert the new mix back to a playable bytestring
    mix = np.frombuffer(intwave_mix, np.byte)
    return mix 

# 需要导入模块: import numpy [as 别名]
# 或者: from numpy import byte [as 别名]
def plot_results(data, nth_iteration):
    """
    Plots the list it receives and cuts off the first ten entries to circumvent the plotting of initial silence

    :param data: A list of data to be plotted
    :param nth_iteration: Used for the label of the x axis
    """

    # Plot the data
    plt.plot(data[10:])

    # Label the axes
    plt.xlabel('Time (every {}th {} byte)'.format(nth_iteration, CHUNK))
    plt.ylabel('Volume level difference (in dB)')

    # Calculate and output the absolute median difference level
    plt.suptitle('Difference - Median (in dB): {}'.format(np.round(np.fabs(np.median(data)), decimals=5)), fontsize=14)

    # Display the plotted graph
    plt.show() 

# 需要导入模块: import numpy [as 别名]
# 或者: from numpy import byte [as 别名]
def _unsigned_subtract(a, b):
    """
    Subtract two values where a >= b, and produce an unsigned result

    This is needed when finding the difference between the upper and lower
    bound of an int16 histogram
    """
    # coerce to a single type
    signed_to_unsigned = {
        np.byte: np.ubyte,
        np.short: np.ushort,
        np.intc: np.uintc,
        np.int_: np.uint,
        np.longlong: np.ulonglong
    }
    dt = np.result_type(a, b)
    try:
        dt = signed_to_unsigned[dt.type]
    except KeyError:  # pragma: no cover
        return np.subtract(a, b, dtype=dt)
    else:
        # we know the inputs are integers, and we are deliberately casting
        # signed to unsigned
        return np.subtract(a, b, casting='unsafe', dtype=dt) 

# 需要导入模块: import numpy [as 别名]
# 或者: from numpy import byte [as 别名]
def _test_type_repr(self, t):
        finfo = np.finfo(t)
        last_fraction_bit_idx = finfo.nexp + finfo.nmant
        last_exponent_bit_idx = finfo.nexp
        storage_bytes = np.dtype(t).itemsize*8
        # could add some more types to the list below
        for which in ['small denorm', 'small norm']:
            # Values from http://en.wikipedia.org/wiki/IEEE_754
            constr = np.array([0x00]*storage_bytes, dtype=np.uint8)
            if which == 'small denorm':
                byte = last_fraction_bit_idx // 8
                bytebit = 7-(last_fraction_bit_idx % 8)
                constr[byte] = 1 << bytebit
            elif which == 'small norm':
                byte = last_exponent_bit_idx // 8
                bytebit = 7-(last_exponent_bit_idx % 8)
                constr[byte] = 1 << bytebit
            else:
                raise ValueError('hmm')
            val = constr.view(t)[0]
            val_repr = repr(val)
            val2 = t(eval(val_repr))
            if not (val2 == 0 and val < 1e-100):
                assert_equal(val, val2) 

# 需要导入模块: import numpy [as 别名]
# 或者: from numpy import byte [as 别名]
def managed_geotiff_shapefile_dir():
    """Creates a temp dir with a globally contiguous shapefile and geotiff"""
    with TestGeodataManager() as tgm:
        array = np.array([[[1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
                           [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
                           [1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 1, 2, 1, 1, 1],
                           [1, 2, 1, 1, 1, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 1, 1],
                           [1, 2, 1, 2, 2, 1, 1, 2, 1, 2, 1, 2, 2, 2, 1, 2, 1, 1, 1],
                           [1, 2, 1, 1, 2, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 1, 1],
                           [1, 2, 2, 2, 2, 1, 2, 2, 2, 2, 1, 2, 1, 2, 1, 2, 2, 2, 1],
                           [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
                           [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
                           [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]]], dtype=np.byte)
        tgm.create_temp_tiff("temp.tif", np.transpose(array, (0, 2, 1)))
        tgm.create_100x100_shp("temp.shp")
        yield tgm 

# 需要导入模块: import numpy [as 别名]
# 或者: from numpy import byte [as 别名]
def _test_type_repr(self, t):
        finfo=np.finfo(t)
        last_fraction_bit_idx = finfo.nexp + finfo.nmant
        last_exponent_bit_idx = finfo.nexp
        storage_bytes = np.dtype(t).itemsize*8
        # could add some more types to the list below
        for which in ['small denorm', 'small norm']:
            # Values from http://en.wikipedia.org/wiki/IEEE_754
            constr = np.array([0x00]*storage_bytes, dtype=np.uint8)
            if which == 'small denorm':
                byte = last_fraction_bit_idx // 8
                bytebit = 7-(last_fraction_bit_idx % 8)
                constr[byte] = 1<<bytebit
            elif which == 'small norm':
                byte = last_exponent_bit_idx // 8
                bytebit = 7-(last_exponent_bit_idx % 8)
                constr[byte] = 1<<bytebit
            else:
                raise ValueError('hmm')
            val = constr.view(t)[0]
            val_repr = repr(val)
            val2 = t(eval(val_repr))
            if not (val2 == 0 and val < 1e-100):
                assert_equal(val, val2) 

# 需要导入模块: import numpy [as 别名]
# 或者: from numpy import byte [as 别名]
def makePathFromArrays(points, tags, contours):
    n_contours = len(contours)
    n_points = len(tags)
    assert len(points) >= n_points
    assert points.shape[1:] == (2,)
    if points.dtype != numpy.long:
        points = numpy.floor(points + [0.5, 0.5])
        points = points.astype(numpy.long)
    assert tags.dtype == numpy.byte
    assert contours.dtype == numpy.short
    path = objc.objc_object(
        c_void_p=_makePathFromArrays(
            n_contours,
            n_points,
            points.ctypes.data_as(FT_Vector_p),
            tags.ctypes.data_as(c_char_p),
            contours.ctypes.data_as(c_short_p)))
    # See comment in makePathFromOutline()
    path.release()
    return path 

# 需要导入模块: import numpy [as 别名]
# 或者: from numpy import byte [as 别名]
def __init__(self, glyphName, masterModel, masterPoints, contours, tags, components, getSubGlyph):
        self.model, masterPoints = masterModel.getSubModel(masterPoints)
        masterPoints = [numpy.array(pts, coordinateType) for pts in masterPoints]
        try:
            self.deltas = self.model.getDeltas(masterPoints)
        except ValueError:
            # outlines are not compatible, fall back to the default master
            print(f"Glyph '{glyphName}' is not interpolatable", file=sys.stderr)
            self.deltas = [masterPoints[self.model.reverseMapping[0]]]
        if components:
            self._contours = None
            self._tags = None
        else:
            self._contours = numpy.array(contours, numpy.short)
            self._tags = numpy.array(tags, numpy.byte)
        self.components = components
        self._getSubGlyph = getSubGlyph
        self.varLocation = {}
        self._points = None 

# 需要导入模块: import numpy [as 别名]
# 或者: from numpy import byte [as 别名]
def gs_from_np(dtype):
    dtype = np.dtype(dtype)
    if dtype == np.byte:
        return gxa.GS_BYTE
    elif dtype == np.ubyte:
        return gxa.GS_UBYTE
    elif dtype == np.int16:
        return gxa.GS_SHORT
    elif dtype == np.uint16:
        return gxa.GS_USHORT
    elif dtype == np.int32:
        return gxa.GS_LONG
    elif dtype == np.uint32:
        return gxa.GS_ULONG
    elif dtype == np.int64:
        return gxa.GS_LONG64
    elif dtype == np.uint64:
        return gxa.GS_ULONG64
    elif dtype == np.float32:
        return gxa.GS_FLOAT
    elif dtype == np.float64:
        return gxa.GS_DOUBLE
    else:
        raise gxa.GXAPIError("Numpy array type does not map to one of the supported GS_TYPES"); 

# 需要导入模块: import numpy [as 别名]
# 或者: from numpy import byte [as 别名]
def hash_array(array):
    """Compute hash of a NumPy array by hashing data as a byte sequence.

    Args:
        array (array): NumPy array to compute hash of.

    Returns:
        hash (int): Computed hash as an integer.
    """
    if XXHASH_AVAILABLE:
        # If fast Python wrapper of fast xxhash implementation is available use
        # in preference to built in hash function
        h = xxhash.xxh64()
        # Update hash by viewing array as byte sequence - no copy required
        h.update(array.view(np.byte).data)
        # Also update hash by array dtype, shape and strides to avoid clashes
        # between different views of same array
        h.update(bytes(f'{array.dtype}{array.shape}{array.strides}', 'utf-8'))
        return h.intdigest()
    else:
        # Evaluate built-in hash function on *copy* of data as a byte sequence
        return hash(array.tobytes()) 

# 需要导入模块: import numpy [as 别名]
# 或者: from numpy import byte [as 别名]
def batch_make_att_masks(node_list, tree_decoder = None, walker = None, dtype=np.byte):
    if walker is None:
        walker = OnehotBuilder()
    if tree_decoder is None:
        tree_decoder = create_tree_decoder()

    true_binary = np.zeros((len(node_list), cmd_args.max_decode_steps, DECISION_DIM), dtype=dtype)
    rule_masks = np.zeros((len(node_list), cmd_args.max_decode_steps, DECISION_DIM), dtype=dtype)

    for i in range(len(node_list)):
        node = node_list[i]
        tree_decoder.decode(node, walker)

        true_binary[i, np.arange(walker.num_steps), walker.global_rule_used[:walker.num_steps]] = 1
        true_binary[i, np.arange(walker.num_steps, cmd_args.max_decode_steps), -1] = 1

        for j in range(walker.num_steps):
            rule_masks[i, j, walker.mask_list[j]] = 1

        rule_masks[i, np.arange(walker.num_steps, cmd_args.max_decode_steps), -1] = 1.0

    return true_binary, rule_masks 

# 需要导入模块: import numpy [as 别名]
# 或者: from numpy import byte [as 别名]
def process_chunk(smiles_list):
    grammar = parser.Grammar(cmd_args.grammar_file)

    cfg_tree_list = []
    for smiles in smiles_list:
        ts = parser.parse(smiles, grammar)
        assert isinstance(ts, list) and len(ts) == 1

        n = AnnotatedTree2MolTree(ts[0])
        cfg_tree_list.append(n)

    walker = OnehotBuilder()
    tree_decoder = create_tree_decoder()
    onehot, masks = batch_make_att_masks(cfg_tree_list, tree_decoder, walker, dtype=np.byte)

    return (onehot, masks)