(gdb) bt#0  PyObject_Malloc (nbytes=80) at /usr/src/debug/Python-2.7.5/Objects/obmalloc.c:804#1  0x00007f1d75c8b792 in array_alloc (type=0x7f1d761e9dc0 <PyArray_Type>, __NPY_UNUSED_TAGGEDnitems=<optimized out>) at numpy/core/src/multiarray/arrayobject.c:1767#2  0x00007f1d75cece12 in PyArray_NewFromDescr_int (subtype=0x7f1d761e9dc0 <PyArray_Type>, descr=0x7f1d761eab00 <DOUBLE_Descr>, nd=1, dims=0x7f1b94180e80, strides=<optimized out>, data=0x0, flags=0,    obj=0x0, base=0x0, zeroed=0, allow_emptystring=0) at numpy/core/src/multiarray/ctors.c:1003#3  0x00007f1d75ced393 in PyArray_NewFromDescrAndBase (base=0x0, obj=obj@entry=0x0, flags=0, data=data@entry=0x0, strides=strides@entry=0x0, dims=<optimized out>, nd=<optimized out>,    descr=<optimized out>, subtype=<optimized out>) at numpy/core/src/multiarray/ctors.c:1181#4  PyArray_NewFromDescr (subtype=<optimized out>, descr=<optimized out>, nd=<optimized out>, dims=<optimized out>, strides=strides@entry=0x0, data=data@entry=0x0, flags=0, obj=obj@entry=0x0)    at numpy/core/src/multiarray/ctors.c:1166#5  0x00007f1d75eea8d7 in execute_legacy_ufunc_loop (ufunc=0x18a6620, trivial_loop_ok=trivial_loop_ok@entry=1, op=op@entry=0x7f1b9fffd480, dtypes=dtypes@entry=0x7f1b9fffc1e0, order=NPY_KEEPORDER,    buffersize=8192, arr_prep=arr_prep@entry=0x7f1b9fffc2e0, full_args=..., op_flags=op_flags@entry=0x7f1b9fffc0e0) at numpy/core/src/umath/ufunc_object.c:1691#6  0x00007f1d75eeceae in PyUFunc_GenericFunction (ufunc=ufunc@entry=0x18a6620, args=args@entry=(<numpy.ndarray at remote 0x7f1c3c06ab6f>, <numpy.float64 at remote 0x7f1d88fb3b40>), kwds=kwds@entry=0x0,    op=op@entry=0x7f1b9fffd480) at numpy/core/src/umath/ufunc_object.c:3262#7  0x00007f1d75eedd5e in ufunc_generic_call (ufunc=0x18a6620, args=(<numpy.ndarray at remote 0x7f1c3c06ab6f>, <numpy.float64 at remote 0x7f1d88fb3b40>), kwds=0x0)    at numpy/core/src/umath/ufunc_object.c:4688#8  0x00007f1d88a85a63 in PyObject_Call (func=func@entry=<numpy.ufunc at remote 0x18a6620>, arg=arg@entry=(<numpy.ndarray at remote 0x7f1c3c06ab6f>, <numpy.float64 at remote 0x7f1d88fb3b40>),    kw=kw@entry=0x0) at /usr/src/debug/Python-2.7.5/Objects/abstract.c:2529#9  0x00007f1d88a8635c in PyObject_CallFunctionObjArgs (callable=<numpy.ufunc at remote 0x18a6620>) at /usr/src/debug/Python-2.7.5/Objects/abstract.c:2760#10 0x00007f1d75dad2db in PyArray_GenericBinaryFunction (op=<optimized out>, m2=<numpy.float64 at remote 0x7f1d88fb3b40>, m1=0x7f1c3c06ab6f) at numpy/core/src/multiarray/number.c:284#11 array_divide (m1=0x7f1c3c06ab6f, m2=<numpy.float64 at remote 0x7f1d88fb3b40>) at numpy/core/src/multiarray/number.c:364#12 0x00007f1d88a8195c in binary_op1 (v=v@entry=<numpy.ndarray at remote 0x7f1c3c06ab6f>, w=w@entry=<numpy.float64 at remote 0x7f1d88fb3b40>, op_slot=24)    at /usr/src/debug/Python-2.7.5/Objects/abstract.c:945#13 0x00007f1d88a81d82 in binary_op (v=<numpy.ndarray at remote 0x7f1c3c06ab6f>, w=<numpy.float64 at remote 0x7f1d88fb3b40>, op_slot=<optimized out>, op_name=0x7f1d88b66466 "/")    at /usr/src/debug/Python-2.7.5/Objects/abstract.c:997#14 0x00007f1d88b1de2c in PyEval_EvalFrameEx (    f=f@entry=Frame 0x7f1b000d0750, for file function_cache/eggs_extract/uc_audio_audio_vggish_feature/vggish_feature-0.1-py2.7/vggish_feature/mel_features.py, line 180, in spectrogram_to_mel_matrix (num_mel_bins=64, num_spectrogram_bins=257, audio_sample_rate=16000, lower_edge_hertz=125, upper_edge_hertz=7500, nyquist_hertz=<float at remote 0x7f1b7c13e948>, spectrogram_bins_hertz=<numpy.ndarray at remote 0x7f1c3c06a710>, spectrogram_bins_mel=<numpy.ndarray at remote 0x7f1c3c06a850>, band_edges_mel=<numpy.ndarray at remote 0x7f1c3c06aa30>, mel_weights_matrix=<numpy.ndarray at remote 0x7f1c3c06acb0>, i=17, lower_edge_mel=<numpy.float64 at remote 0x7f1d7a6bdd68>, center_mel=<numpy.float64 at remote 0x7f1d7a6bdf00>, upper_edge_mel=<numpy.float64 at remote 0x7f1d7a6bd4b0>, lower_slope=<numpy.ndarray at remote 0x7f1c3c06a120>, upper_slope=<numpy.ndarray at remote 0x7f1c3c06aee0>), throwflag=throwflag@entry=0) at /usr/src/debug/Python-2.7.5/Python/ceval.c:1481#15 0x00007f1d88b2103d in PyEval_EvalCodeEx (co=<optimized out>, globals=<optimized out>, locals=locals@entry=0x0, args=args@entry=0x7f1d88fe1068, argcount=0, kws=kws@entry=0x7f1c4c05f4a8,    kwcount=kwcount@entry=5, defs=defs@entry=0x7f1d7d7b7d28, defcount=defcount@entry=5, closure=0x0) at /usr/src/debug/Python-2.7.5/Python/ceval.c:3640#16 0x00007f1d88aaaa6d in function_call (func=<function at remote 0x7f1c540acf50>, arg=(),    kw={'num_mel_bins': 64, 'upper_edge_hertz': 7500, 'lower_edge_hertz': 125, 'num_spectrogram_bins': 257, 'audio_sample_rate': 16000}) at /usr/src/debug/Python-2.7.5/Objects/funcobject.c:526#17 0x00007f1d88a85a63 in PyObject_Call (func=func@entry=<function at remote 0x7f1c540acf50>, arg=arg@entry=(),    kw=kw@entry={'num_mel_bins': 64, 'upper_edge_hertz': 7500, 'lower_edge_hertz': 125, 'num_spectrogram_bins': 257, 'audio_sample_rate': 16000}) at /usr/src/debug/Python-2.7.5/Objects/abstract.c:2529#18 0x00007f1d88b196fd in ext_do_call (nk=<optimized out>, na=<optimized out>, flags=<optimized out>, pp_stack=0x7f1b9fffdd38, func=<function at remote 0x7f1c540acf50>)    at /usr/src/debug/Python-2.7.5/Python/ceval.c:4721#19 PyEval_EvalFrameEx (    f=f@entry=Frame 0x7f1d3c016e80, for file function_cache/eggs_extract/uc_audio_audio_vggish_feature/vggish_feature-0.1-py2.7/vggish_feature/mel_features.py, line 222, in log_mel_spectrogram (data=<numpy.ndarray at remote 0x7f1c64133c60>, audio_sample_rate=16000, log_offset=<float at remote 0x7f1d3c00b4e0>, window_length_secs=<float at remote 0x7f1d3c00b5a0>, hop_length_secs=<float at remote 0x7f1d3c00b4e0>, kwargs={'num_mel_bins': 64, 'upper_edge_hertz': 7500, 'lower_edge_hertz': 125}, window_length_samples=400, hop_length_samples=160, fft_length=512, spectrogram=<numpy.ndarray at remote 0x7f1c3c06a990>), throwflag=throwflag@entry=0) at /usr/src/debug/Python-2.7.5/Python/ceval.c:3079#20 0x00007f1d88b2103d in PyEval_EvalCodeEx (co=<optimized out>, globals=<optimized out>, locals=locals@entry=0x0, args=<optimized out>, argcount=1, kws=0x7f1d38001f10, kwcount=7, defs=0x7f1c540e9fe0,    defcount=4, closure=closure@entry=0x0) at /usr/src/debug/Python-2.7.5/Python/ceval.c:3640#21 0x00007f1d88b1e53c in fast_function (nk=<optimized out>, na=<optimized out>, n=<optimized out>, pp_stack=0x7f1b9fffdf40, func=<optimized out>) at /usr/src/debug/Python-2.7.5/Python/ceval.c:4504#22 call_function (oparg=<optimized out>, pp_stack=0x7f1b9fffdf40) at /usr/src/debug/Python-2.7.5/Python/ceval.c:4429#23 PyEval_EvalFrameEx (---Type <return> to continue, or q <return> to quit---qf=f@entry=Frame 0x7f1d38001d50, for file function_cache/eggs_extract/uc_audio_audio_vggish_feature/vggish_feature-0.1-py2.7/vggish_feature/vggish_input.py, line 60, in waveform_to_Quit(gdb)

the python exec is :lower_slope = ((spectrogram_bins_mel - lower_edge_mel) /                   (center_mel - lower_edge_mel))