@cache(level=<NUM_LIT:20>)<EOL>def zero_crossings(y, threshold=<NUM_LIT>, ref_magnitude=None, pad=True,<EOL>zero_pos=True, axis=-<NUM_LIT:1>):
<EOL>if threshold is None:<EOL><INDENT>threshold = <NUM_LIT:0.0><EOL><DEDENT>if six.callable(ref_magnitude):<EOL><INDENT>threshold = threshold * ref_magnitude(np.abs(y))<EOL><DEDENT>elif ref_magnitude is not None:<EOL><INDENT>threshold = threshold * ref_magnitude<EOL><DEDENT>if threshold > <NUM_LIT:0>:<EOL><INDENT>y = y.copy()<EOL>y[np.abs(y) <= threshold] = <NUM_LIT:0><EOL><DEDENT>if zero_pos:<EOL><INDENT>y_sign = np.signbit(y)<EOL><DEDENT>else:<EOL><INDENT>y_sign = np.sign(y)<EOL><DEDENT>slice_pre = [slice(None)] * y.ndim<EOL>slice_pre[axis] = slice(<NUM_LIT:1>, None)<EOL>slice_post = [slice(None)] * y.ndim<EOL>slice_post[axis] = slice(-<NUM_LIT:1>)<EOL>padding = [(<NUM_LIT:0>, <NUM_LIT:0>)] * y.ndim<EOL>padding[axis] = (<NUM_LIT:1>, <NUM_LIT:0>)<EOL>return np.pad((y_sign[tuple(slice_post)] != y_sign[tuple(slice_pre)]),<EOL>padding,<EOL>mode='<STR_LIT>',<EOL>constant_values=pad)<EOL>
Find the zero-crossings of a signal `y`: indices `i` such that
    `sign(y[i]) != sign(y[j])`.

    If `y` is multi-dimensional, then zero-crossings are computed along
    the specified `axis`.


    Parameters
    ----------
    y : np.ndarray
        The input array

    threshold : float > 0 or None
        If specified, values where `-threshold <= y <= threshold` are
        clipped to 0.

    ref_magnitude : float > 0 or callable
        If numeric, the threshold is scaled relative to `ref_magnitude`.

        If callable, the threshold is scaled relative to
        `ref_magnitude(np.abs(y))`.

    pad : boolean
        If `True`, then `y[0]` is considered a valid zero-crossing.

    zero_pos : boolean
        If `True` then the value 0 is interpreted as having positive sign.

        If `False`, then 0, -1, and +1 all have distinct signs.

    axis : int
        Axis along which to compute zero-crossings.

    Returns
    -------
    zero_crossings : np.ndarray [shape=y.shape, dtype=boolean]
        Indicator array of zero-crossings in `y` along the selected axis.

    Notes
    -----
    This function caches at level 20.

    Examples
    --------
    >>> # Generate a time-series
    >>> y = np.sin(np.linspace(0, 4 * 2 * np.pi, 20))
    >>> y
    array([  0.000e+00,   9.694e-01,   4.759e-01,  -7.357e-01,
            -8.372e-01,   3.247e-01,   9.966e-01,   1.646e-01,
            -9.158e-01,  -6.142e-01,   6.142e-01,   9.158e-01,
            -1.646e-01,  -9.966e-01,  -3.247e-01,   8.372e-01,
             7.357e-01,  -4.759e-01,  -9.694e-01,  -9.797e-16])
    >>> # Compute zero-crossings
    >>> z = librosa.zero_crossings(y)
    >>> z
    array([ True, False, False,  True, False,  True, False, False,
            True, False,  True, False,  True, False, False,  True,
           False,  True, False,  True], dtype=bool)
    >>> # Stack y against the zero-crossing indicator
    >>> np.vstack([y, z]).T
    array([[  0.000e+00,   1.000e+00],
           [  9.694e-01,   0.000e+00],
           [  4.759e-01,   0.000e+00],
           [ -7.357e-01,   1.000e+00],
           [ -8.372e-01,   0.000e+00],
           [  3.247e-01,   1.000e+00],
           [  9.966e-01,   0.000e+00],
           [  1.646e-01,   0.000e+00],
           [ -9.158e-01,   1.000e+00],
           [ -6.142e-01,   0.000e+00],
           [  6.142e-01,   1.000e+00],
           [  9.158e-01,   0.000e+00],
           [ -1.646e-01,   1.000e+00],
           [ -9.966e-01,   0.000e+00],
           [ -3.247e-01,   0.000e+00],
           [  8.372e-01,   1.000e+00],
           [  7.357e-01,   0.000e+00],
           [ -4.759e-01,   1.000e+00],
           [ -9.694e-01,   0.000e+00],
           [ -9.797e-16,   1.000e+00]])
    >>> # Find the indices of zero-crossings
    >>> np.nonzero(z)
    (array([ 0,  3,  5,  8, 10, 12, 15, 17, 19]),)