Segmentation fault when fitting 2-dimensional array for class loess

[yjiangnan]

According to documentation in the files, class loess is able to handle multi-dimensional features:

loess = _loess.loess
"""
loess : locally weighted estimates. Multi-variate version
:Keywords:
    x : ndarray
        A (n,p) ndarray of independent variables, with n the number of observations
        and p the number of variables.
    y : ndarray
        A (n,) ndarray of observations

However, when I tried it, I simply got "Segmentation fault: 11". The code for reproduction is:

from numpy import *
x = random.randn(20, 5)
y = sum(x, axis=1) + sum(random.randn(20, 5), axis=1)
lo = loess(x, y)
lo.fit()

I tried to narrow down the location for the error by inserting output in the .c codes, and the problem is in line 41 in file loessc.c inside block "interpolate/1.approx": F77_SUB(lowesb)(x, y, weights, diagonal, &one, iv, &liv, &lv, v); This line seems to call a Fortran function lowesb. However, I am not sure how the interaction between C and Fortran works and how to write and debug Fortran codes. Can anyone identify and fix the problem, please?

By the way, I am using the python3-compatible version https://github.com/jcrotinger/pyloess. After the Segmentation fault, the OS shows the following crash report: Process: Python [33329] Path: /Library/Frameworks/Python.framework/Versions/3.6/Resources/Python.app/Contents/MacOS/Python Identifier: Python Version: 3.6.0 (3.6.0) Code Type: X86-64 (Native) Parent Process: bash [79547] Responsible: Python [33329] User ID: 502

Date/Time: 2018-05-17 14:30:20.699 +0200 OS Version: Mac OS X 10.12.3 (16D32) Report Version: 12 Anonymous UUID: 6F848FCA-A0EC-0BDD-4156-6F44A1C752ED

Sleep/Wake UUID: B93DB63A-E8E4-4627-BBE7-B3C3A8F29FD5

Time Awake Since Boot: 10000000 seconds Time Since Wake: 2000000 seconds

System Integrity Protection: enabled

Crashed Thread: 0 Dispatch queue: com.apple.main-thread

Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: EXC_I386_GPFLT Exception Note: EXC_CORPSE_NOTIFY

Termination Signal: Segmentation fault: 11 Termination Reason: Namespace SIGNAL, Code 0xb Terminating Process: exc handler [0]

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 loess.cpython-36m-darwin.so 0x0000000103d2ba90 ehg139 + 1968 1 ??? 0xfff8000000000000 0 + 18444492273895866368

Thread 0 crashed with X86 Thread State (64-bit): rax: 0x0000000000000014 rbx: 0x0000000000000000 rcx: 0x00007fff5bffd780 rdx: 0x00007fff5bffd820 rdi: 0x0000000000000015 rsi: 0xfff8000000000000 rbp: 0x0000000000000000 rsp: 0x00007fff5bffd520 r8: 0x0000000000000008 r9: 0x000000000000012c r10: 0x0000000000000000 r11: 0x0000000000000014 r12: 0x0000000000000000 r13: 0x0000000000000000 r14: 0x000000010117b728 r15: 0x000000010117c178 rip: 0x0000000103d2ba90 rfl: 0x0000000000010202 cr2: 0x0000000103d37cd0

Logical CPU: 3 Error Code: 0x00000000 Trap Number: 13

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0x7fffe3e5cff7 libsystem_info.dylib (503.30.1) <9ED9121C-F111-3FAD-BC2F-C95DEE1C9362> /usr/lib/system/libsystem_info.dylib 0x7fffe3e5d000 - 0x7fffe3e7fff7 libsystem_kernel.dylib (3789.41.3) <B75B128C-7D7A-3318-91CD-82B5A69C5329> /usr/lib/system/libsystem_kernel.dylib 0x7fffe3e80000 - 0x7fffe3ec7fe7 libsystem_m.dylib (3121.4) <266DB92B-A86F-3691-80FB-1B26AD73CFF3> /usr/lib/system/libsystem_m.dylib 0x7fffe3ec8000 - 0x7fffe3ee6ff7 libsystem_malloc.dylib (116.30.3) <F40DEE3B-386A-3529-A3F7-98117ED55BF4> /usr/lib/system/libsystem_malloc.dylib 0x7fffe3ee7000 - 0x7fffe3f3effb libsystem_network.dylib (856.30.16) <4AE368E9-605D-379D-B04C-2AC7455B8250> /usr/lib/system/libsystem_network.dylib 0x7fffe3f3f000 - 0x7fffe3f48ff3 libsystem_networkextension.dylib (563.30.15) <EB020B0C-7DF0-3EEF-8E3C-15DA3C01D687> /usr/lib/system/libsystem_networkextension.dylib 0x7fffe3f49000 - 0x7fffe3f52ff3 libsystem_notify.dylib (165.20.1) <E7FD3A7C-DD07-36E2-9FA4-7561F9F114DA> /usr/lib/system/libsystem_notify.dylib 0x7fffe3f53000 - 0x7fffe3f5bfe7 libsystem_platform.dylib (126.1.2) <3CA06D4E-C00A-36DE-AA65-3A390097D1F6> /usr/lib/system/libsystem_platform.dylib 0x7fffe3f5c000 - 0x7fffe3f66ff7 libsystem_pthread.dylib (218.30.1) <C869ED7C-BE29-3532-8E69-3A8DA1447EDC> /usr/lib/system/libsystem_pthread.dylib 0x7fffe3f67000 - 0x7fffe3f6aff7 libsystem_sandbox.dylib (592.31.1) <7BBFDF96-293F-3DD9-B3A4-7C168280B441> /usr/lib/system/libsystem_sandbox.dylib 0x7fffe3f6b000 - 0x7fffe3f6cfff libsystem_secinit.dylib (24) <5C1F1E47-0F7D-3E25-8DEB-D9DB1F902281> /usr/lib/system/libsystem_secinit.dylib 0x7fffe3f6d000 - 0x7fffe3f74fff libsystem_symptoms.dylib (532.30.6) <5D990CF5-B58F-39F7-B375-99B4EC62CFBD> /usr/lib/system/libsystem_symptoms.dylib 0x7fffe3f75000 - 0x7fffe3f95ff7 libsystem_trace.dylib (518.30.7) <6D34D1EA-2A3C-3D2D-803E-A666E6AEEE52> /usr/lib/system/libsystem_trace.dylib 0x7fffe3f96000 - 0x7fffe3f9bffb libunwind.dylib (35.3) <9F7C2AD8-A9A7-3DE4-828D-B0F0F166AAA0> /usr/lib/system/libunwind.dylib 0x7fffe3f9c000 - 0x7fffe3fc5ff7 libxpc.dylib (972.30.7) <65E41BB6-EBD5-3D93-B0BE-B190CEE4DD93> /usr/lib/system/libxpc.dylib

External Modification Summary: Calls made by other processes targeting this process: task_for_pid: 141 thread_create: 0 thread_set_state: 0 Calls made by this process: task_for_pid: 0 thread_create: 0 thread_set_state: 0 Calls made by all processes on this machine: task_for_pid: 793027647 thread_create: 0 thread_set_state: 0

VM Region Summary: ReadOnly portion of Libraries: Total=154.4M resident=0K(0%) swapped_out_or_unallocated=154.4M(100%) Writable regions: Total=63.2M written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=63.2M(100%)

                            VIRTUAL   REGION 

REGION TYPE SIZE COUNT (non-coalesced) =========== ======= ======= Kernel Alloc Once 8K 2 MALLOC 46.3M 28 MALLOC guard page 16K 4 MALLOC_LARGE (reserved) 384K 4 reserved VM address space (unallocated) VM_ALLOCATE 8K 3 __DATA 4336K 96 __LINKEDIT 114.6M 35 __TEXT 39.8M 91 __UNICODE 556K 2 __UNIXSTACK 16.0M 2 shared memory 12K 4 =========== ======= ======= TOTAL 221.9M 260 TOTAL, minus reserved VM space 221.6M 260

Model: MacBookPro8,1, BootROM MBP81.0047.B2D, 2 processors, Intel Core i7, 2.8 GHz, 8 GB, SMC 1.68f99 Graphics: Intel HD Graphics 3000, Intel HD Graphics 3000, Built-In Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1333 MHz, 0x80CE, 0x4D3437314235323733444D302D4348392020 Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1333 MHz, 0x80CE, 0x4D3437314235323733444D302D4348392020 AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0xD6), Broadcom BCM43xx 1.0 (5.106.98.100.24) Bluetooth: Version 5.0.3f1, 3 services, 27 devices, 1 incoming serial ports Network Service: Wi-Fi, AirPort, en1 Serial ATA Device: Samsung SSD 850 EVO 500GB, 500.11 GB Serial ATA Device: MATSHITADVD-R UJ-8A8 USB Device: USB 2.0 Bus USB Device: Hub USB Device: IR Receiver USB Device: USB 2.0 Bus USB Device: FaceTime HD Camera (Built-in) USB Device: Hub USB Device: Apple Internal Keyboard / Trackpad USB Device: BRCM2070 Hub USB Device: Bluetooth USB Host Controller Thunderbolt Bus: MacBook Pro, Apple Inc., 22.1