U 5dz @sdZddlZddlZddlZddlZddlmZddl m Z ddl m Z ddl mZdd lmZd Zd d d ddddddddddddddddddd d!d"d#d$d%d&gZed'd(d(d)d*d Zee d+d,ed-d.dZedd/d0dZd1dZed'd2d3d Zed4dZed'd2d5dZeddd6d7d8dZed'd(dd9d:dZee d;d,ejdddd<d=dZedd2d>dZedd2d?dZed@dZ ee d;d,dAddBdCdZ!edej"dDdEd Z#edddd6dFdGdZ$ee d;d,dd6d'dHdIdZ%edd(dJdKdZ&dLd!Z'eddMdNdZ(edd'dOdPd"Z)ej*d6d6dQdd'dRdSdTZ+dd'dRdUdVZ,edd'dRdWdZ-edd2dXdZ.eej/dYdZd#Z0eej"dYd[d$Z1ej*d6d6dQd\d]Z2ed'd2d^d%Z3ej*d6d6dQd_d`Z4ed'd2dad&Z5dS)bzUtility functionsN) as_strided)cache)ParameterError) Deprecated)deprecate_positional_argsi MAX_MEM_BLOCKframe pad_center expand_to fix_length valid_audio valid_intvalid_intervals fix_frames axis_sortlocalmaxlocalmin normalize peak_pick sparsify_rowsshearstackfill_off_diagonalindex_to_slicesyncsoftmask buf_to_floattinycyclic_gradient dtype_r2c dtype_c2r count_unique is_uniqueF)axis writeablesubokc Cstj|d|d}|j||kr4td|j|||dkrJtd||jt|j|g}t|j}|||d8<t|t|g}t|||||d} |dkr|d} n|d} t | d| } t d g| j } t dd || |<| t| S) aSlice a data array into (overlapping) frames. This implementation uses low-level stride manipulation to avoid making a copy of the data. The resulting frame representation is a new view of the same input data. For example, a one-dimensional input ``x = [0, 1, 2, 3, 4, 5, 6]`` can be framed with frame length 3 and hop length 2 in two ways. The first (``axis=-1``), results in the array ``x_frames``:: [[0, 2, 4], [1, 3, 5], [2, 4, 6]] where each column ``x_frames[:, i]`` contains a contiguous slice of the input ``x[i * hop_length : i * hop_length + frame_length]``. The second way (``axis=0``) results in the array ``x_frames``:: [[0, 1, 2], [2, 3, 4], [4, 5, 6]] where each row ``x_frames[i]`` contains a contiguous slice of the input. This generalizes to higher dimensional inputs, as shown in the examples below. In general, the framing operation increments by 1 the number of dimensions, adding a new "frame axis" either before the framing axis (if ``axis < 0``) or after the framing axis (if ``axis >= 0``). Parameters ---------- x : np.ndarray Array to frame frame_length : int > 0 [scalar] Length of the frame hop_length : int > 0 [scalar] Number of steps to advance between frames axis : int The axis along which to frame. writeable : bool If ``True``, then the framed view of ``x`` is read-only. If ``False``, then the framed view is read-write. Note that writing to the framed view will also write to the input array ``x`` in this case. subok : bool If True, sub-classes will be passed-through, otherwise the returned array will be forced to be a base-class array (default). Returns ------- x_frames : np.ndarray [shape=(..., frame_length, N_FRAMES, ...)] A framed view of ``x``, for example with ``axis=-1`` (framing on the last dimension):: x_frames[..., j] == x[..., j * hop_length : j * hop_length + frame_length] If ``axis=0`` (framing on the first dimension), then:: x_frames[j] = x[j * hop_length : j * hop_length + frame_length] Raises ------ ParameterError If ``x.shape[axis] < frame_length``, there is not enough data to fill one frame. If ``hop_length < 1``, frames cannot advance. See Also -------- numpy.lib.stride_tricks.as_strided Examples -------- Extract 2048-sample frames from monophonic signal with a hop of 64 samples per frame >>> y, sr = librosa.load(librosa.ex('trumpet')) >>> frames = librosa.util.frame(y, frame_length=2048, hop_length=64) >>> frames array([[-1.407e-03, -2.604e-02, ..., -1.795e-05, -8.108e-06], [-4.461e-04, -3.721e-02, ..., -1.573e-05, -1.652e-05], ..., [ 7.960e-02, -2.335e-01, ..., -6.815e-06, 1.266e-05], [ 9.568e-02, -1.252e-01, ..., 7.397e-06, -1.921e-05]], dtype=float32) >>> y.shape (117601,) >>> frames.shape (2048, 1806) Or frame along the first axis instead of the last: >>> frames = librosa.util.frame(y, frame_length=2048, hop_length=64, axis=0) >>> frames.shape (1806, 2048) Frame a stereo signal: >>> y, sr = librosa.load(librosa.ex('trumpet', hq=True), mono=False) >>> y.shape (2, 117601) >>> frames = librosa.util.frame(y, frame_length=2048, hop_length=64) (2, 2048, 1806) Carve an STFT into fixed-length patches of 32 frames with 50% overlap >>> y, sr = librosa.load(librosa.ex('trumpet')) >>> S = np.abs(librosa.stft(y)) >>> S.shape (1025, 230) >>> S_patch = librosa.util.frame(S, frame_length=32, hop_length=16) >>> S_patch.shape (1025, 32, 13) >>> # The first patch contains the first 32 frames of S >>> np.allclose(S_patch[:, :, 0], S[:, :32]) True >>> # The second patch contains frames 16 to 16+32=48, and so on >>> np.allclose(S_patch[:, :, 1], S[:, 16:48]) True F)copyr(z1Input is too short (n={:d}) for frame_length={:d}rzInvalid hop_length: {:d})stridesshaper(r'rr%N) nparrayr+rformatr*tuplelistrZmoveaxisslicendim) xZ frame_lengthZ hop_lengthr&r'r(Z out_stridesZx_shape_trimmedZ out_shapeZxwZ target_axisslicesr56/tmp/pip-unpacked-wheel-8l90aumz/librosa/util/utils.pyr 4s8}  )level)monocCst|tjstdt|jtjs,td|jdkrFtd|j t|t rTd}|rv|jdkrvtd|j|j t | stdd S) afDetermine whether a variable contains valid audio data. The following conditions must be satisfied: - ``type(y)`` is ``np.ndarray`` - ``y.dtype`` is floating-point - ``y.ndim != 0`` (must have at least one dimension) - ``np.isfinite(y).all()`` samples must be all finite values If ``mono`` is specified, then we additionally require - ``y.ndim == 1`` Parameters ---------- y : np.ndarray The input data to validate mono : bool Whether or not to require monophonic audio .. warning:: The ``mono`` parameter is deprecated in version 0.9 and will be removed in 0.10. Returns ------- valid : bool True if all tests pass Raises ------ ParameterError In any of the conditions specified above fails Notes ----- This function caches at level 20. Examples -------- >>> # By default, valid_audio allows only mono signals >>> filepath = librosa.ex('trumpet', hq=True) >>> y_mono, sr = librosa.load(filepath, mono=True) >>> y_stereo, _ = librosa.load(filepath, mono=False) >>> librosa.util.valid_audio(y_mono), librosa.util.valid_audio(y_stereo) True, False >>> # To allow stereo signals, set mono=False >>> librosa.util.valid_audio(y_stereo, mono=False) True See Also -------- numpy.float32 z(Audio data must be of type numpy.ndarrayz!Audio data must be floating-pointrz=Audio data must be at least one-dimensional, given y.shape={}Frz7Invalid shape for monophonic audio: ndim={:d}, shape={}z%Audio buffer is not finite everywhereT) isinstancer,Zndarrayr issubdtypedtypefloatingr2r.r+risfiniteall)yr9r5r5r6rs,:   castcCs*|dkrtj}t|stdt||S)aEnsure that an input value is integer-typed. This is primarily useful for ensuring integrable-valued array indices. Parameters ---------- x : number A scalar value to be cast to int cast : function [optional] A function to modify ``x`` before casting. Default: `np.floor` Returns ------- x_int : int ``x_int = int(cast(x))`` Raises ------ ParameterError If ``cast`` is provided and is not callable. Nzcast parameter must be callable)r,floorcallablerint)r3rBr5r5r6r+s cCsX|jdks|jddkr tdt|dddf|dddfkrTtd|dS) aEnsure that an array is a valid representation of time intervals: - intervals.ndim == 2 - intervals.shape[1] == 2 - intervals[i, 0] <= intervals[i, 1] for all i Parameters ---------- intervals : np.ndarray [shape=(n, 2)] set of time intervals Returns ------- valid : bool True if ``intervals`` passes validation. rr%z intervals must have shape (n, 2)Nrrz-intervals={} must have non-negative durationsT)r2r+rr,anyr.)Z intervalsr5r5r6rMs&r&cKsr|dd|j|}t||d}dg|j}|t|||f||<|dkrbtd||tj||f|S)a(Pad an array to a target length along a target axis. This differs from `np.pad` by centering the data prior to padding, analogous to `str.center` Examples -------- >>> # Generate a vector >>> data = np.ones(5) >>> librosa.util.pad_center(data, size=10, mode='constant') array([ 0., 0., 1., 1., 1., 1., 1., 0., 0., 0.]) >>> # Pad a matrix along its first dimension >>> data = np.ones((3, 5)) >>> librosa.util.pad_center(data, size=7, axis=0) array([[ 0., 0., 0., 0., 0.], [ 0., 0., 0., 0., 0.], [ 1., 1., 1., 1., 1.], [ 1., 1., 1., 1., 1.], [ 1., 1., 1., 1., 1.], [ 0., 0., 0., 0., 0.], [ 0., 0., 0., 0., 0.]]) >>> # Or its second dimension >>> librosa.util.pad_center(data, size=7, axis=1) array([[ 0., 1., 1., 1., 1., 1., 0.], [ 0., 1., 1., 1., 1., 1., 0.], [ 0., 1., 1., 1., 1., 1., 0.]]) Parameters ---------- data : np.ndarray Vector to be padded and centered size : int >= len(data) [scalar] Length to pad ``data`` axis : int Axis along which to pad and center the data **kwargs : additional keyword arguments arguments passed to `np.pad` Returns ------- data_padded : np.ndarray ``data`` centered and padded to length ``size`` along the specified axis Raises ------ ParameterError If ``size < data.shape[axis]`` See Also -------- numpy.pad modeconstantrrrrz5Target size ({:d}) must be at least input size ({:d})) setdefaultr+rEr2rr.r,pad)datasizer&kwargsnZlpadlengthsr5r5r6r js9    cCsz t|}Wntk r*t|g}YnXt||jkrLtd||j||jkrhtd|j|dg|}t|D]\}}|j|||<qz||S)aExpand the dimensions of an input array with Parameters ---------- x : np.ndarray The input array ndim : int The number of dimensions to expand to. Must be at least ``x.ndim`` axes : int or slice The target axis or axes to preserve from x. All other axes will have length 1. Returns ------- x_exp : np.ndarray The expanded version of ``x``, satisfying the following: ``x_exp[axes] == x`` ``x_exp.ndim == ndim`` See Also -------- np.expand_dims Examples -------- Expand a 1d array into an (n, 1) shape >>> x = np.arange(3) >>> librosa.util.expand_to(x, ndim=2, axes=0) array([[0], [1], [2]]) Expand a 1d array into a (1, n) shape >>> librosa.util.expand_to(x, ndim=2, axes=1) array([[0, 1, 2]]) Expand a 2d array into (1, n, m, 1) shape >>> x = np.vander(np.arange(3)) >>> librosa.util.expand_to(x, ndim=4, axes=[1,2]).shape (1, 3, 3, 1) z3Shape mismatch between axes={} and input x.shape={}z4Cannot expand x.shape={} to fewer dimensions ndim={}r) r/ TypeErrorlenr2rr.r+ enumeratereshape)r3r2Zaxesr+iZaxir5r5r6r s 1     cKs|dd|j|}||krHtdg|j}td|||<|t|S||kr|dg|j}d||f||<tj||f|S|S)amFix the length an array ``data`` to exactly ``size`` along a target axis. If ``data.shape[axis] < n``, pad according to the provided kwargs. By default, ``data`` is padded with trailing zeros. Examples -------- >>> y = np.arange(7) >>> # Default: pad with zeros >>> librosa.util.fix_length(y, size=10) array([0, 1, 2, 3, 4, 5, 6, 0, 0, 0]) >>> # Trim to a desired length >>> librosa.util.fix_length(y, size=5) array([0, 1, 2, 3, 4]) >>> # Use edge-padding instead of zeros >>> librosa.util.fix_length(y, size=10, mode='edge') array([0, 1, 2, 3, 4, 5, 6, 6, 6, 6]) Parameters ---------- data : np.ndarray array to be length-adjusted size : int >= 0 [scalar] desired length of the array axis : int, <= data.ndim axis along which to fix length **kwargs : additional keyword arguments Parameters to ``np.pad`` Returns ------- data_fixed : np.ndarray [shape=data.shape] ``data`` either trimmed or padded to length ``size`` along the specified axis. See Also -------- numpy.pad rHrINrrJ)rKr+r1r2r/r,rL)rMrNr&rOrPr4rQr5r5r6r s*    Tx_minx_maxrLcCst|}t|dkr td|rB|dk s4|dk rBt|||}|r|g}|dk r\|||dk rn||t||f}|dk r|||k}|dk r|||k}t|t S)avFix a list of frames to lie within [x_min, x_max] Examples -------- >>> # Generate a list of frame indices >>> frames = np.arange(0, 1000.0, 50) >>> frames array([ 0., 50., 100., 150., 200., 250., 300., 350., 400., 450., 500., 550., 600., 650., 700., 750., 800., 850., 900., 950.]) >>> # Clip to span at most 250 >>> librosa.util.fix_frames(frames, x_max=250) array([ 0, 50, 100, 150, 200, 250]) >>> # Or pad to span up to 2500 >>> librosa.util.fix_frames(frames, x_max=2500) array([ 0, 50, 100, 150, 200, 250, 300, 350, 400, 450, 500, 550, 600, 650, 700, 750, 800, 850, 900, 950, 2500]) >>> librosa.util.fix_frames(frames, x_max=2500, pad=False) array([ 0, 50, 100, 150, 200, 250, 300, 350, 400, 450, 500, 550, 600, 650, 700, 750, 800, 850, 900, 950]) >>> # Or starting away from zero >>> frames = np.arange(200, 500, 33) >>> frames array([200, 233, 266, 299, 332, 365, 398, 431, 464, 497]) >>> librosa.util.fix_frames(frames) array([ 0, 200, 233, 266, 299, 332, 365, 398, 431, 464, 497]) >>> librosa.util.fix_frames(frames, x_max=500) array([ 0, 200, 233, 266, 299, 332, 365, 398, 431, 464, 497, 500]) Parameters ---------- frames : np.ndarray [shape=(n_frames,)] List of non-negative frame indices x_min : int >= 0 or None Minimum allowed frame index x_max : int >= 0 or None Maximum allowed frame index pad : boolean If ``True``, then ``frames`` is expanded to span the full range ``[x_min, x_max]`` Returns ------- fixed_frames : np.ndarray [shape=(n_fixed_frames,), dtype=int] Fixed frame indices, flattened and sorted Raises ------ ParameterError If ``frames`` contains negative values rzNegative frame index detectedN) r,asarrayrFrZclipappendZ concatenateuniqueastyperE)framesrXrYrLZpad_datar5r5r6r6s"9     )r&indexvaluecCs|dkrtj}|jdkr td||td||jd}t|}tdg|j}|||<|rp|t||fS|t|SdS)a6 Sort an array along its rows or columns. Examples -------- Visualize NMF output for a spectrogram S >>> # Sort the columns of W by peak frequency bin >>> y, sr = librosa.load(librosa.ex('trumpet')) >>> S = np.abs(librosa.stft(y)) >>> W, H = librosa.decompose.decompose(S, n_components=64) >>> W_sort = librosa.util.axis_sort(W) Or sort by the lowest frequency bin >>> W_sort = librosa.util.axis_sort(W, value=np.argmin) Or sort the rows instead of the columns >>> W_sort_rows = librosa.util.axis_sort(W, axis=0) Get the sorting index also, and use it to permute the rows of H >>> W_sort, idx = librosa.util.axis_sort(W, index=True) >>> H_sort = H[idx, :] >>> import matplotlib.pyplot as plt >>> fig, ax = plt.subplots(nrows=2, ncols=2) >>> img_w = librosa.display.specshow(librosa.amplitude_to_db(W, ref=np.max), ... y_axis='log', ax=ax[0, 0]) >>> ax[0, 0].set(title='W') >>> ax[0, 0].label_outer() >>> img_act = librosa.display.specshow(H, x_axis='time', ax=ax[0, 1]) >>> ax[0, 1].set(title='H') >>> ax[0, 1].label_outer() >>> librosa.display.specshow(librosa.amplitude_to_db(W_sort, ... ref=np.max), ... y_axis='log', ax=ax[1, 0]) >>> ax[1, 0].set(title='W sorted') >>> librosa.display.specshow(H_sort, x_axis='time', ax=ax[1, 1]) >>> ax[1, 1].set(title='H sorted') >>> ax[1, 1].label_outer() >>> fig.colorbar(img_w, ax=ax[:, 0], orientation='horizontal') >>> fig.colorbar(img_act, ax=ax[:, 1], orientation='horizontal') Parameters ---------- S : np.ndarray [shape=(d, n)] Array to be sorted axis : int [scalar] The axis along which to compute the sorting values - ``axis=0`` to sort rows by peak column index - ``axis=1`` to sort columns by peak row index index : boolean [scalar] If true, returns the index array as well as the permuted data. value : function function to return the index corresponding to the sort order. Default: `np.argmax`. Returns ------- S_sort : np.ndarray [shape=(d, n)] ``S`` with the columns or rows permuted in sorting order idx : np.ndarray (optional) [shape=(d,) or (n,)] If ``index == True``, the sorting index used to permute ``S``. Length of ``idx`` corresponds to the selected ``axis``. Raises ------ ParameterError If ``S`` does not have exactly 2 dimensions (``S.ndim != 2``) Nrz'axis_sort is only defined for 2D arraysrrG)r,Zargmaxr2rmodZargsortr1r/)Sr&r_r`Zbin_idxidxZ sort_slicer5r5r6rsN  ()normr& thresholdfillc Cs|dkrt|}n|dkr(td||dkr>td|tt|sVtdt|t}d}|tj krtj ||dd }n|tj krtj ||dd }n|dkr|dkrtd tj |dk|d|j d }ntt|tjr>|dkr>tj |||dd d |}|dkr*|jd |}n|j|d |}n |dkrL|Stdt|||k}t|} |dkrd ||<||| dd<nJ|rtj||<||| dd<|| t| <ntj ||<||| dd<| S)aNormalize an array along a chosen axis. Given a norm (described below) and a target axis, the input array is scaled so that:: norm(S, axis=axis) == 1 For example, ``axis=0`` normalizes each column of a 2-d array by aggregating over the rows (0-axis). Similarly, ``axis=1`` normalizes each row of a 2-d array. This function also supports thresholding small-norm slices: any slice (i.e., row or column) with norm below a specified ``threshold`` can be left un-normalized, set to all-zeros, or filled with uniform non-zero values that normalize to 1. Note: the semantics of this function differ from `scipy.linalg.norm` in two ways: multi-dimensional arrays are supported, but matrix-norms are not. Parameters ---------- S : np.ndarray The array to normalize norm : {np.inf, -np.inf, 0, float > 0, None} - `np.inf` : maximum absolute value - `-np.inf` : minimum absolute value - `0` : number of non-zeros (the support) - float : corresponding l_p norm See `scipy.linalg.norm` for details. - None : no normalization is performed axis : int [scalar] Axis along which to compute the norm. threshold : number > 0 [optional] Only the columns (or rows) with norm at least ``threshold`` are normalized. By default, the threshold is determined from the numerical precision of ``S.dtype``. fill : None or bool If None, then columns (or rows) with norm below ``threshold`` are left as is. If False, then columns (rows) with norm below ``threshold`` are set to 0. If True, then columns (rows) with norm below ``threshold`` are filled uniformly such that the corresponding norm is 1. .. note:: ``fill=True`` is incompatible with ``norm=0`` because no uniform vector exists with l0 "norm" equal to 1. Returns ------- S_norm : np.ndarray [shape=S.shape] Normalized array Raises ------ ParameterError If ``norm`` is not among the valid types defined above If ``S`` is not finite If ``fill=True`` and ``norm=0`` See Also -------- scipy.linalg.norm Notes ----- This function caches at level 40. Examples -------- >>> # Construct an example matrix >>> S = np.vander(np.arange(-2.0, 2.0)) >>> S array([[-8., 4., -2., 1.], [-1., 1., -1., 1.], [ 0., 0., 0., 1.], [ 1., 1., 1., 1.]]) >>> # Max (l-infinity)-normalize the columns >>> librosa.util.normalize(S) array([[-1. , 1. , -1. , 1. ], [-0.125, 0.25 , -0.5 , 1. ], [ 0. , 0. , 0. , 1. ], [ 0.125, 0.25 , 0.5 , 1. ]]) >>> # Max (l-infinity)-normalize the rows >>> librosa.util.normalize(S, axis=1) array([[-1. , 0.5 , -0.25 , 0.125], [-1. , 1. , -1. , 1. ], [ 0. , 0. , 0. , 1. ], [ 1. , 1. , 1. , 1. ]]) >>> # l1-normalize the columns >>> librosa.util.normalize(S, norm=1) array([[-0.8 , 0.667, -0.5 , 0.25 ], [-0.1 , 0.167, -0.25 , 0.25 ], [ 0. , 0. , 0. , 0.25 ], [ 0.1 , 0.167, 0.25 , 0.25 ]]) >>> # l2-normalize the columns >>> librosa.util.normalize(S, norm=2) array([[-0.985, 0.943, -0.816, 0.5 ], [-0.123, 0.236, -0.408, 0.5 ], [ 0. , 0. , 0. , 0.5 ], [ 0.123, 0.236, 0.408, 0.5 ]]) >>> # Thresholding and filling >>> S[:, -1] = 1e-308 >>> S array([[ -8.000e+000, 4.000e+000, -2.000e+000, 1.000e-308], [ -1.000e+000, 1.000e+000, -1.000e+000, 1.000e-308], [ 0.000e+000, 0.000e+000, 0.000e+000, 1.000e-308], [ 1.000e+000, 1.000e+000, 1.000e+000, 1.000e-308]]) >>> # By default, small-norm columns are left untouched >>> librosa.util.normalize(S) array([[ -1.000e+000, 1.000e+000, -1.000e+000, 1.000e-308], [ -1.250e-001, 2.500e-001, -5.000e-001, 1.000e-308], [ 0.000e+000, 0.000e+000, 0.000e+000, 1.000e-308], [ 1.250e-001, 2.500e-001, 5.000e-001, 1.000e-308]]) >>> # Small-norm columns can be zeroed out >>> librosa.util.normalize(S, fill=False) array([[-1. , 1. , -1. , 0. ], [-0.125, 0.25 , -0.5 , 0. ], [ 0. , 0. , 0. , 0. ], [ 0.125, 0.25 , 0.5 , 0. ]]) >>> # Or set to constant with unit-norm >>> librosa.util.normalize(S, fill=True) array([[-1. , 1. , -1. , 1. ], [-0.125, 0.25 , -0.5 , 1. ], [ 0. , 0. , 0. , 1. ], [ 0.125, 0.25 , 0.5 , 1. ]]) >>> # With an l1 norm instead of max-norm >>> librosa.util.normalize(S, norm=1, fill=True) array([[-0.8 , 0.667, -0.5 , 0.25 ], [-0.1 , 0.167, -0.25 , 0.25 ], [ 0. , 0. , 0. , 0.25 ], [ 0.1 , 0.167, 0.25 , 0.25 ]]) Nrz&threshold={} must be strictly positive)NFTzfill={} must be None or booleanzInput must be finiterTr&keepdimsz*Cannot normalize with norm=0 and fill=True)r&rir<?gzUnsupported norm: {})rrr.r,r?r>absr]floatinfmaxminsumr<r;typenumberrNr+repr empty_likenanisnan) rbrer&rfrgZmagZ fill_normlengthZ small_idxZSnormr5r5r6rsR         cCsdg|j}d||<tj||dd}tdg|j}tdd||<tdg|j}td|j|||<||t|k||t|k@S) aFind local maxima in an array An element ``x[i]`` is considered a local maximum if the following conditions are met: - ``x[i] > x[i-1]`` - ``x[i] >= x[i+1]`` Note that the first condition is strict, and that the first element ``x[0]`` will never be considered as a local maximum. Examples -------- >>> x = np.array([1, 0, 1, 2, -1, 0, -2, 1]) >>> librosa.util.localmax(x) array([False, False, False, True, False, True, False, True], dtype=bool) >>> # Two-dimensional example >>> x = np.array([[1,0,1], [2, -1, 0], [2, 1, 3]]) >>> librosa.util.localmax(x, axis=0) array([[False, False, False], [ True, False, False], [False, True, True]], dtype=bool) >>> librosa.util.localmax(x, axis=1) array([[False, False, True], [False, False, True], [False, False, True]], dtype=bool) Parameters ---------- x : np.ndarray [shape=(d1,d2,...)] input vector or array axis : int axis along which to compute local maximality Returns ------- m : np.ndarray [shape=x.shape, dtype=bool] indicator array of local maximality along ``axis`` See Also -------- localmin rJrredgerHNrrr2r,rLr1r+r/r3r&ZpaddingsZx_padZinds1Zinds2r5r5r6rs/ cCsdg|j}d||<tj||dd}tdg|j}tdd||<tdg|j}td|j|||<||t|k||t|k@S) aFind local minima in an array An element ``x[i]`` is considered a local minimum if the following conditions are met: - ``x[i] < x[i-1]`` - ``x[i] <= x[i+1]`` Note that the first condition is strict, and that the first element ``x[0]`` will never be considered as a local minimum. Examples -------- >>> x = np.array([1, 0, 1, 2, -1, 0, -2, 1]) >>> librosa.util.localmin(x) array([False, True, False, False, True, False, True, False]) >>> # Two-dimensional example >>> x = np.array([[1,0,1], [2, -1, 0], [2, 1, 3]]) >>> librosa.util.localmin(x, axis=0) array([[False, False, False], [False, True, True], [False, False, False]]) >>> librosa.util.localmin(x, axis=1) array([[False, True, False], [False, True, False], [False, True, False]]) Parameters ---------- x : np.ndarray [shape=(d1,d2,...)] input vector or array axis : int axis along which to compute local minimality Returns ------- m : np.ndarray [shape=x.shape, dtype=bool] indicator array of local minimality along ``axis`` See Also -------- localmax rJrxryrzNrr{rr|r}r5r5r6r s0 cCsd|dkrtd|dkr td|dkr0td|dkr@td|dkrPtd|dkr`td|jdkrrtd t|tjd }t|tjd }t|tjd }t|tjd }t|tjd }||}td ||}tjjj|t |d t || d } ||} td ||} tjjj |t | dt | d} d} | |dkr| |j dkr| |}|dkrf|nd}t ||| || | <| d7} q2|j d|} | dkr| nd} | |j dkr| |}|dkr|nd}t ||| || | <| d7} q||| k}||| |k}g}tj }t|dD]"}|||kr6|||}q6t|S)aC Uses a flexible heuristic to pick peaks in a signal. A sample n is selected as an peak if the corresponding ``x[n]`` fulfills the following three conditions: 1. ``x[n] == max(x[n - pre_max:n + post_max])`` 2. ``x[n] >= mean(x[n - pre_avg:n + post_avg]) + delta`` 3. ``n - previous_n > wait`` where ``previous_n`` is the last sample picked as a peak (greedily). This implementation is based on [#]_ and [#]_. .. [#] Boeck, Sebastian, Florian Krebs, and Markus Schedl. "Evaluating the Online Capabilities of Onset Detection Methods." ISMIR. 2012. .. [#] https://github.com/CPJKU/onset_detection/blob/master/onset_program.py Parameters ---------- x : np.ndarray [shape=(n,)] input signal to peak picks from pre_max : int >= 0 [scalar] number of samples before ``n`` over which max is computed post_max : int >= 1 [scalar] number of samples after ``n`` over which max is computed pre_avg : int >= 0 [scalar] number of samples before ``n`` over which mean is computed post_avg : int >= 1 [scalar] number of samples after ``n`` over which mean is computed delta : float >= 0 [scalar] threshold offset for mean wait : int >= 0 [scalar] number of samples to wait after picking a peak Returns ------- peaks : np.ndarray [shape=(n_peaks,), dtype=int] indices of peaks in ``x`` Raises ------ ParameterError If any input lies outside its defined range Examples -------- >>> y, sr = librosa.load(librosa.ex('trumpet')) >>> onset_env = librosa.onset.onset_strength(y=y, sr=sr, ... hop_length=512, ... aggregate=np.median) >>> peaks = librosa.util.peak_pick(onset_env, pre_max=3, post_max=3, pre_avg=3, post_avg=5, delta=0.5, wait=10) >>> peaks array([ 3, 27, 40, 61, 72, 88, 103]) >>> import matplotlib.pyplot as plt >>> times = librosa.times_like(onset_env, sr=sr, hop_length=512) >>> fig, ax = plt.subplots(nrows=2, sharex=True) >>> D = np.abs(librosa.stft(y)) >>> librosa.display.specshow(librosa.amplitude_to_db(D, ref=np.max), ... y_axis='log', x_axis='time', ax=ax[1]) >>> ax[0].plot(times, onset_env, alpha=0.8, label='Onset strength') >>> ax[0].vlines(times[peaks], 0, ... onset_env.max(), color='r', alpha=0.8, ... label='Selected peaks') >>> ax[0].legend(frameon=True, framealpha=0.8) >>> ax[0].label_outer() rzpre_max must be non-negativezpre_avg must be non-negativezdelta must be non-negativezwait must be non-negativezpost_max must be positivezpost_avg must be positiverz#input array must be one-dimensionalrA?rI)rHorigincvalZnearest)rHr)rr2rr,ceilscipyZndimagefiltersZmaximum_filter1drEroZuniform_filter1dr+meanrmZnonzeror[r-)r3Zpre_maxZpost_maxZpre_avgZpost_avgdeltawait max_lengthZ max_originZmov_maxZ avg_lengthZ avg_originZmov_avgrPstartZ detectionsZpeaksZ last_onsetrVr5r5r6rHstH     g{Gz?)quantiler<c Cs|jdkr|d}n|jdkr0td|jd|krDdksTntd||dkrb|j}tjj|j|d}t |}t j |dd d }t j |dd }t j ||dd }t j||kdd }t|D]6\} } t || || | fk} || | f|| | f<q|S) a~ Return a row-sparse matrix approximating the input Parameters ---------- x : np.ndarray [ndim <= 2] The input matrix to sparsify. quantile : float in [0, 1.0) Percentage of magnitude to discard in each row of ``x`` dtype : np.dtype, optional The dtype of the output array. If not provided, then ``x.dtype`` will be used. Returns ------- x_sparse : ``scipy.sparse.csr_matrix`` [shape=x.shape] Row-sparsified approximation of ``x`` If ``x.ndim == 1``, then ``x`` is interpreted as a row vector, and ``x_sparse.shape == (1, len(x))``. Raises ------ ParameterError If ``x.ndim > 2`` If ``quantile`` lies outside ``[0, 1.0)`` Notes ----- This function caches at level 40. Examples -------- >>> # Construct a Hann window to sparsify >>> x = scipy.signal.hann(32) >>> x array([ 0. , 0.01 , 0.041, 0.09 , 0.156, 0.236, 0.326, 0.424, 0.525, 0.625, 0.72 , 0.806, 0.879, 0.937, 0.977, 0.997, 0.997, 0.977, 0.937, 0.879, 0.806, 0.72 , 0.625, 0.525, 0.424, 0.326, 0.236, 0.156, 0.09 , 0.041, 0.01 , 0. ]) >>> # Discard the bottom percentile >>> x_sparse = librosa.util.sparsify_rows(x, quantile=0.01) >>> x_sparse <1x32 sparse matrix of type '' with 26 stored elements in Compressed Sparse Row format> >>> x_sparse.todense() matrix([[ 0. , 0. , 0. , 0.09 , 0.156, 0.236, 0.326, 0.424, 0.525, 0.625, 0.72 , 0.806, 0.879, 0.937, 0.977, 0.997, 0.997, 0.977, 0.937, 0.879, 0.806, 0.72 , 0.625, 0.525, 0.424, 0.326, 0.236, 0.156, 0.09 , 0. , 0. , 0. ]]) >>> # Discard up to the bottom 10th percentile >>> x_sparse = librosa.util.sparsify_rows(x, quantile=0.1) >>> x_sparse <1x32 sparse matrix of type '' with 20 stored elements in Compressed Sparse Row format> >>> x_sparse.todense() matrix([[ 0. , 0. , 0. , 0. , 0. , 0. , 0.326, 0.424, 0.525, 0.625, 0.72 , 0.806, 0.879, 0.937, 0.977, 0.997, 0.997, 0.977, 0.937, 0.879, 0.806, 0.72 , 0.625, 0.525, 0.424, 0.326, 0. , 0. , 0. , 0. , 0. , 0. ]]) r)rr%rz;Input must have 2 or fewer dimensions. Provided x.shape={}.zInvalid quantile {:.2f}Nr<TrhrG)r2rUrr.r+r<rsparseZ lil_matrixr,rkrpsortZcumsumZargminrTwhereZtocsr) r3rr<Zx_sparseZmagsZnormsZmag_sortZcumulative_magZ threshold_idxrVjrcr5r5r6rs,D    )n_bytesr<cCs8dtdd|d>}d|}|t|||S)aConvert an integer buffer to floating point values. This is primarily useful when loading integer-valued wav data into numpy arrays. Parameters ---------- x : np.ndarray [dtype=int] The integer-valued data buffer n_bytes : int [1, 2, 4] The number of bytes per sample in ``x`` dtype : numeric type The target output type (default: 32-bit float) Returns ------- x_float : np.ndarray [dtype=float] The input data buffer cast to floating point rjrz>> # Generate slices from spaced indices >>> librosa.util.index_to_slice(np.arange(20, 100, 15)) [slice(20, 35, None), slice(35, 50, None), slice(50, 65, None), slice(65, 80, None), slice(80, 95, None)] >>> # Pad to span the range (0, 100) >>> librosa.util.index_to_slice(np.arange(20, 100, 15), ... idx_min=0, idx_max=100) [slice(0, 20, None), slice(20, 35, None), slice(35, 50, None), slice(50, 65, None), slice(65, 80, None), slice(80, 95, None), slice(95, 100, None)] >>> # Use a step of 5 for each slice >>> librosa.util.index_to_slice(np.arange(20, 100, 15), ... idx_min=0, idx_max=100, step=5) [slice(0, 20, 5), slice(20, 35, 5), slice(35, 50, 5), slice(50, 65, 5), slice(65, 80, 5), slice(80, 95, 5), slice(95, 100, 5)] rWcsg|]\}}t||qSr5)r1).0rendrr5r6 sz"index_to_slice..rN)rzip)rcrrrrLZ idx_fixedr5rr6rhs/) aggregaterLr&c Cs|dkrtj}t|j}tdd|Dr2|}n>tdd|Drbtt|d|||d}ntd|t|}t |||<tj |t |rdnd |j d }t dg|j} t dg|j} t|D]4\} } | | |<| | |<||t| |d |t| <q|S) a Synchronous aggregation of a multi-dimensional array between boundaries .. note:: In order to ensure total coverage, boundary points may be added to ``idx``. If synchronizing a feature matrix against beat tracker output, ensure that frame index numbers are properly aligned and use the same hop length. Parameters ---------- data : np.ndarray multi-dimensional array of features idx : iterable of ints or slices Either an ordered array of boundary indices, or an iterable collection of slice objects. aggregate : function aggregation function (default: `np.mean`) pad : boolean If `True`, ``idx`` is padded to span the full range ``[0, data.shape[axis]]`` axis : int The axis along which to aggregate data Returns ------- data_sync : ndarray ``data_sync`` will have the same dimension as ``data``, except that the ``axis`` coordinate will be reduced according to ``idx``. For example, a 2-dimensional ``data`` with ``axis=-1`` should satisfy:: data_sync[:, i] = aggregate(data[:, idx[i-1]:idx[i]], axis=-1) Raises ------ ParameterError If the index set is not of consistent type (all slices or all integers) Notes ----- This function caches at level 40. Examples -------- Beat-synchronous CQT spectra >>> y, sr = librosa.load(librosa.ex('choice')) >>> tempo, beats = librosa.beat.beat_track(y=y, sr=sr, trim=False) >>> C = np.abs(librosa.cqt(y=y, sr=sr)) >>> beats = librosa.util.fix_frames(beats) By default, use mean aggregation >>> C_avg = librosa.util.sync(C, beats) Use median-aggregation instead of mean >>> C_med = librosa.util.sync(C, beats, ... aggregate=np.median) Or sub-beat synchronization >>> sub_beats = librosa.segment.subsegment(C, beats) >>> sub_beats = librosa.util.fix_frames(sub_beats) >>> C_med_sub = librosa.util.sync(C, sub_beats, aggregate=np.median) Plot the results >>> import matplotlib.pyplot as plt >>> beat_t = librosa.frames_to_time(beats, sr=sr) >>> subbeat_t = librosa.frames_to_time(sub_beats, sr=sr) >>> fig, ax = plt.subplots(nrows=3, sharex=True, sharey=True) >>> librosa.display.specshow(librosa.amplitude_to_db(C, ... ref=np.max), ... x_axis='time', ax=ax[0]) >>> ax[0].set(title='CQT power, shape={}'.format(C.shape)) >>> ax[0].label_outer() >>> librosa.display.specshow(librosa.amplitude_to_db(C_med, ... ref=np.max), ... x_coords=beat_t, x_axis='time', ax=ax[1]) >>> ax[1].set(title='Beat synchronous CQT power, ' ... 'shape={}'.format(C_med.shape)) >>> ax[1].label_outer() >>> librosa.display.specshow(librosa.amplitude_to_db(C_med_sub, ... ref=np.max), ... x_coords=subbeat_t, x_axis='time', ax=ax[2]) >>> ax[2].set(title='Sub-beat synchronous CQT power, ' ... 'shape={}'.format(C_med_sub.shape)) NcSsg|]}t|tqSr5)r:r1r_r5r5r6rszsync..cSsg|]}tt|tjqSr5)r,r;rqintegerrr5r5r6rsr)rrrLzInvalid index set: {}FC)orderr<rG)r,rr0r+r?rrZrr.rSemptyZ isfortranr<r1r2rTr/) rMrcrrLr&r+r4Z agg_shapeZdata_aggZidx_inZidx_aggrVsegmentr5r5r6rs6]  )power split_zerosc Cs|j|jkr td|j|jt|dks 0 or np.inf If finite, returns the soft mask computed in a numerically stable way If infinite, returns a hard (binary) mask equivalent to ``X > X_ref``. Note: for hard masks, ties are always broken in favor of ``X_ref`` (``mask=0``). split_zeros : bool If `True`, entries where ``X`` and ``X_ref`` are both small (close to 0) will receive mask values of 0.5. Otherwise, the mask is set to 0 for these entries. Returns ------- mask : np.ndarray, shape=X.shape The output mask array Raises ------ ParameterError If ``X`` and ``X_ref`` have different shapes. If ``X`` or ``X_ref`` are negative anywhere If ``power <= 0`` Examples -------- >>> X = 2 * np.ones((3, 3)) >>> X_ref = np.vander(np.arange(3.0)) >>> X array([[ 2., 2., 2.], [ 2., 2., 2.], [ 2., 2., 2.]]) >>> X_ref array([[ 0., 0., 1.], [ 1., 1., 1.], [ 4., 2., 1.]]) >>> librosa.util.softmask(X, X_ref, power=1) array([[ 1. , 1. , 0.667], [ 0.667, 0.667, 0.667], [ 0.333, 0.5 , 0.667]]) >>> librosa.util.softmask(X_ref, X, power=1) array([[ 0. , 0. , 0.333], [ 0.333, 0.333, 0.333], [ 0.667, 0.5 , 0.333]]) >>> librosa.util.softmask(X, X_ref, power=2) array([[ 1. , 1. , 0.8], [ 0.8, 0.8, 0.8], [ 0.2, 0.5, 0.8]]) >>> librosa.util.softmask(X, X_ref, power=4) array([[ 1. , 1. , 0.941], [ 0.941, 0.941, 0.941], [ 0.059, 0.5 , 0.941]]) >>> librosa.util.softmask(X, X_ref, power=100) array([[ 1.000e+00, 1.000e+00, 1.000e+00], [ 1.000e+00, 1.000e+00, 1.000e+00], [ 7.889e-31, 5.000e-01, 1.000e+00]]) >>> librosa.util.softmask(X, X_ref, power=np.inf) array([[ True, True, True], [ True, True, True], [False, False, True]], dtype=bool) zShape mismatch: {}!={}rz X and X_ref must be non-negativezpower must be strictly positiverr~r)r+rr.r,rFr<r;r=float32maximumr]finforr>) XZX_refrrr<ZZbad_idxmaskZref_maskZgood_idxr5r5r6rs,N      cCsDt|}t|jtjs*t|jtjr2|j}ntj}t|jS)aCompute the tiny-value corresponding to an input's data type. This is the smallest "usable" number representable in ``x.dtype`` (e.g., float32). This is primarily useful for determining a threshold for numerical underflow in division or multiplication operations. Parameters ---------- x : number or np.ndarray The array to compute the tiny-value for. All that matters here is ``x.dtype`` Returns ------- tiny_value : float The smallest positive usable number for the type of ``x``. If ``x`` is integer-typed, then the tiny value for ``np.float32`` is returned instead. See Also -------- numpy.finfo Examples -------- For a standard double-precision floating point number: >>> librosa.util.tiny(1.0) 2.2250738585072014e-308 Or explicitly as double-precision >>> librosa.util.tiny(np.asarray(1e-5, dtype=np.float64)) 2.2250738585072014e-308 Or complex numbers >>> librosa.util.tiny(1j) 2.2250738585072014e-308 Single-precision floating point: >>> librosa.util.tiny(np.asarray(1e-5, dtype=np.float32)) 1.1754944e-38 Integer >>> librosa.util.tiny(5) 1.1754944e-38 ) r,rZr;r<r=Zcomplexfloatingrrr)r3r<r5r5r6rs7 )r`cCs|j\}}t|t|j}|j\}}t|jd|jd}||krptj|||d}tj|| d}n"tj||d}tj|| |d}|||<|||<dS)a.Sets all cells of a matrix to a given ``value`` if they lie outside a constraint region. In this case, the constraint region is the Sakoe-Chiba band which runs with a fixed ``radius`` along the main diagonal. When ``x.shape[0] != x.shape[1]``, the radius will be expanded so that ``x[-1, -1] = 1`` always. ``x`` will be modified in place. Parameters ---------- x : np.ndarray [shape=(N, M)] Input matrix, will be modified in place. radius : float The band radius (1/2 of the width) will be ``int(radius*min(x.shape))`` value : int ``x[n, m] = value`` when ``(n, m)`` lies outside the band. Examples -------- >>> x = np.ones((8, 8)) >>> librosa.util.fill_off_diagonal(x, radius=0.25) >>> x array([[1, 1, 0, 0, 0, 0, 0, 0], [1, 1, 1, 0, 0, 0, 0, 0], [0, 1, 1, 1, 0, 0, 0, 0], [0, 0, 1, 1, 1, 0, 0, 0], [0, 0, 0, 1, 1, 1, 0, 0], [0, 0, 0, 0, 1, 1, 1, 0], [0, 0, 0, 0, 0, 1, 1, 1], [0, 0, 0, 0, 0, 0, 1, 1]]) >>> x = np.ones((8, 12)) >>> librosa.util.fill_off_diagonal(x, radius=0.25) >>> x array([[1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0], [1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0], [0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0], [0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0], [0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0], [0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0], [0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1], [0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1]]) rr)kN)r+r,roundrorkZtriu_indices_fromZtril_indices_from)r3Zradiusr`ZnxnyoffsetZidx_uZidx_lr5r5r6rs1   edge_orderr&cCsddg|j}||f||<tj||dd}tj|||d}tdg|j}t|| ||<|t|S)a.Estimate the gradient of a function over a uniformly sampled, periodic domain. This is essentially the same as `np.gradient`, except that edge effects are handled by wrapping the observations (i.e. assuming periodicity) rather than extrapolation. Parameters ---------- data : np.ndarray The function values observed at uniformly spaced positions on a periodic domain edge_order : {1, 2} The order of the difference approximation used for estimating the gradient axis : int The axis along which gradients are calculated. Returns ------- grad : np.ndarray like ``data`` The gradient of ``data`` taken along the specified axis. See Also -------- numpy.gradient Examples -------- This example estimates the gradient of cosine (-sine) from 64 samples using direct (aperiodic) and periodic gradient calculation. >>> import matplotlib.pyplot as plt >>> x = 2 * np.pi * np.linspace(0, 1, num=64, endpoint=False) >>> y = np.cos(x) >>> grad = np.gradient(y) >>> cyclic_grad = librosa.util.cyclic_gradient(y) >>> true_grad = -np.sin(x) * 2 * np.pi / len(x) >>> fig, ax = plt.subplots() >>> ax.plot(x, true_grad, label='True gradient', linewidth=5, ... alpha=0.35) >>> ax.plot(x, cyclic_grad, label='cyclic_gradient') >>> ax.plot(x, grad, label='np.gradient', linestyle=':') >>> ax.legend() >>> # Zoom into the first part of the sequence >>> ax.set(xlim=[0, np.pi/16], ylim=[-0.025, 0.025]) rJwraprzrN)r2r,rLZgradientr1r/)rMrr&paddingZdata_padZgradr4r5r5r6r s3  )Znopythonrfactorr&cCsf|dkr|j}t|}t|jdD],}t|dd|f|||dd|f<q&|dkrb|j}|S)z2Numba-accelerated shear for dense (ndarray) arraysrrN)Tr,rtranger+roll)rrr&X_shearrVr5r5r6 __shear_denseVs *rcCsz|j}|dkr|j}|jdd}t|t|jdt|j}tj |j ||jd|j d|dkrp|j}| |S)zFast shearing for sparse matrices Shearing is performed using CSC array indices, and the result is converted back to whatever sparse format the data was originally provided in. rT)r)r)out) r.rZtocscr,repeatZaranger+ZdiffZindptrraindicesZasformat)rrr&rrrr5r5r6__shear_sparsehs $rcCsLtt|tjs td|tj|r:t |||dSt |||dSdS)aeShear a matrix by a given factor. The column ``X[:, n]`` will be displaced (rolled) by ``factor * n`` This is primarily useful for converting between lag and recurrence representations: shearing with ``factor=-1`` converts the main diagonal to a horizontal. Shearing with ``factor=1`` converts a horizontal to a diagonal. Parameters ---------- X : np.ndarray [ndim=2] or scipy.sparse matrix The array to be sheared factor : integer The shear factor: ``X[:, n] -> np.roll(X[:, n], factor * n)`` axis : integer The axis along which to shear Returns ------- X_shear : same type as ``X`` The sheared matrix Examples -------- >>> E = np.eye(3) >>> librosa.util.shear(E, factor=-1, axis=-1) array([[1., 1., 1.], [0., 0., 0.], [0., 0., 0.]]) >>> librosa.util.shear(E, factor=-1, axis=0) array([[1., 0., 0.], [1., 0., 0.], [1., 0., 0.]]) >>> librosa.util.shear(E, factor=1, axis=-1) array([[1., 0., 0.], [0., 0., 1.], [0., 1., 0.]]) z factor={} must be integer-valuedrN) r,r;rqrrr.rrZ isspmatrixrr)rrr&r5r5r6rs + cCsdd|D}t|dkr$tdnt|dkr8td|}|dkrVtj||dStt|gt|}tdd |Dg}tj||d d }tj|||d |Sd S)a+Stack one or more arrays along a target axis. This function is similar to `np.stack`, except that memory contiguity is retained when stacking along the first dimension. This is useful when combining multiple monophonic audio signals into a multi-channel signal, or when stacking multiple feature representations to form a multi-dimensional array. Parameters ---------- arrays : list one or more `np.ndarray` axis : integer The target axis along which to stack. ``axis=0`` creates a new first axis, and ``axis=-1`` creates a new last axis. Returns ------- arr_stack : np.ndarray [shape=(len(arrays), array_shape) or shape=(array_shape, len(arrays))] The input arrays, stacked along the target dimension. If ``axis=0``, then ``arr_stack`` will be F-contiguous. Otherwise, ``arr_stack`` will be C-contiguous by default, as computed by `np.stack`. Raises ------ ParameterError - If ``arrays`` do not all have the same shape - If no ``arrays`` are given See Also -------- numpy.stack numpy.ndarray.flags frame Examples -------- Combine two buffers into a contiguous arrays >>> y_left = np.ones(5) >>> y_right = -np.ones(5) >>> y_stereo = librosa.util.stack([y_left, y_right], axis=0) >>> y_stereo array([[ 1., 1., 1., 1., 1.], [-1., -1., -1., -1., -1.]]) >>> y_stereo.flags C_CONTIGUOUS : False F_CONTIGUOUS : True OWNDATA : True WRITEABLE : True ALIGNED : True WRITEBACKIFCOPY : False UPDATEIFCOPY : False Or along the trailing axis >>> y_stereo = librosa.util.stack([y_left, y_right], axis=-1) >>> y_stereo array([[ 1., -1.], [ 1., -1.], [ 1., -1.], [ 1., -1.], [ 1., -1.]]) >>> y_stereo.flags C_CONTIGUOUS : True F_CONTIGUOUS : False OWNDATA : True WRITEABLE : True ALIGNED : True WRITEBACKIFCOPY : False UPDATEIFCOPY : False cSsh|] }|jqSr5)r+rZarrr5r5r6 szstack..rz)all input arrays must have the same shapez3at least one input array must be provided for stackrrGcSsg|] }|jqSr5rrr5r5r6rszstack..r)r<r)r&rN) rSrpopr,rr/r0Zfind_common_typer)Zarraysr&ZshapesZshape_inr+r<resultr5r5r6rsN   )defaultcCs\ttjtjttjtjttttji}t|}|j dkrJ|St| ||S)aFind the complex numpy dtype corresponding to a real dtype. This is used to maintain numerical precision and memory footprint when constructing complex arrays from real-valued data (e.g. in a Fourier transform). A `float32` (single-precision) type maps to `complex64`, while a `float64` (double-precision) maps to `complex128`. Parameters ---------- d : np.dtype The real-valued dtype to convert to complex. If ``d`` is a complex type already, it will be returned. default : np.dtype, optional The default complex target type, if ``d`` does not match a known dtype Returns ------- d_c : np.dtype The complex dtype See Also -------- dtype_c2r numpy.dtype Examples -------- >>> librosa.util.dtype_r2c(np.float32) dtype('complex64') >>> librosa.util.dtype_r2c(np.int16) dtype('complex64') >>> librosa.util.dtype_r2c(np.complex128) dtype('complex128') c) r,r<r complex64float64 complex128rlcomplexrqkindgetdrmappingdtr5r5r6r!!s*     cCsdttjtjttjtjttttjji}t|}|j dkrL|St| t||S)a(Find the real numpy dtype corresponding to a complex dtype. This is used to maintain numerical precision and memory footprint when constructing real arrays from complex-valued data (e.g. in an inverse Fourier transform). A `complex64` (single-precision) type maps to `float32`, while a `complex128` (double-precision) maps to `float64`. Parameters ---------- d : np.dtype The complex-valued dtype to convert to real. If ``d`` is a real (float) type already, it will be returned. default : np.dtype, optional The default real target type, if ``d`` does not match a known dtype Returns ------- d_r : np.dtype The real dtype See Also -------- dtype_r2c numpy.dtype Examples -------- >>> librosa.util.dtype_r2c(np.complex64) dtype('float32') >>> librosa.util.dtype_r2c(np.float32) dtype('float32') >>> librosa.util.dtype_r2c(np.int16) dtype('float32') >>> librosa.util.dtype_r2c(np.complex128) dtype('float64') f) r,r<rrrrrrlrqrrrr5r5r6r"Zs-     cCst|}|jdS)zCounts the number of unique values in an array. This function is a helper for `count_unique` and is not to be called directly. r)r,r\r+r3Zuniquesr5r5r6__count_uniques rcCstt||S)aCount the number of unique values in a multi-dimensional array along a given axis. Parameters ---------- data : np.ndarray The input array axis : int The target axis to count Returns ------- n_uniques The number of unique values. This array will have one fewer dimension than the input. See Also -------- is_unique Examples -------- >>> x = np.vander(np.arange(5)) >>> x array([[ 0, 0, 0, 0, 1], [ 1, 1, 1, 1, 1], [ 16, 8, 4, 2, 1], [ 81, 27, 9, 3, 1], [256, 64, 16, 4, 1]]) >>> # Count unique values along rows (within columns) >>> librosa.util.count_unique(x, axis=0) array([5, 5, 5, 5, 1]) >>> # Count unique values along columns (within rows) >>> librosa.util.count_unique(x, axis=-1) array([2, 1, 5, 5, 5]) )r,apply_along_axisrrMr&r5r5r6r#s&cCst|}|jd|jkS)zDetermines if the input array has all unique values. This function is a helper for `is_unique` and is not to be called directly. r)r,r\r+rNrr5r5r6 __is_uniques rcCstt||S)aDetermine if the input array consists of all unique values along a given axis. Parameters ---------- data : np.ndarray The input array axis : int The target axis Returns ------- is_unique Array of booleans indicating whether the data is unique along the chosen axis. This array will have one fewer dimension than the input. See Also -------- count_unique Examples -------- >>> x = np.vander(np.arange(5)) >>> x array([[ 0, 0, 0, 0, 1], [ 1, 1, 1, 1, 1], [ 16, 8, 4, 2, 1], [ 81, 27, 9, 3, 1], [256, 64, 16, 4, 1]]) >>> # Check uniqueness along rows >>> librosa.util.is_unique(x, axis=0) array([ True, True, True, True, False]) >>> # Check uniqueness along columns >>> librosa.util.is_unique(x, axis=-1) array([False, False, True, True, True]) )r,rrrr5r5r6r$s))6__doc__Z scipy.ndimagerZ scipy.sparseZnumpyr,ZnumbaZnumpy.lib.stride_tricksr_cacher exceptionsr deprecationrZ decoratorsrr __all__r rrrr r r rrrmrrrrrrrrrrrrr Zjitrrrrrr!r"rr#rr$r5r5r5r6s      !T!I F:Q_d<= b4{rDD? 3g8;  (