[92da231] | 1 | r""" |
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[eafc9fa] | 2 | DLL driver for C kernels |
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[750ffa5] | 3 | |
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[3764ec1] | 4 | If the environment variable *SAS_OPENMP* is set, then sasmodels |
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| 5 | will attempt to compile with OpenMP flags so that the model can use all |
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| 6 | available kernels. This may or may not be available on your compiler |
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| 7 | toolchain. Depending on operating system and environment. |
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[92da231] | 8 | |
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[3764ec1] | 9 | Windows does not have provide a compiler with the operating system. |
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| 10 | Instead, we assume that TinyCC is installed and available. This can |
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| 11 | be done with a simple pip command if it is not already available:: |
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[92da231] | 12 | |
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[3764ec1] | 13 | pip install tinycc |
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[92da231] | 14 | |
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[3764ec1] | 15 | If Microsoft Visual C++ is available (because VCINSTALLDIR is |
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| 16 | defined in the environment), then that will be used instead. |
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| 17 | Microsoft Visual C++ for Python is available from Microsoft: |
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[92da231] | 18 | |
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[d138d43] | 19 | `<http://www.microsoft.com/en-us/download/details.aspx?id=44266>`_ |
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[92da231] | 20 | |
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[3764ec1] | 21 | If neither compiler is available, sasmodels will check for *MinGW*, |
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| 22 | the GNU compiler toolchain. This available in packages such as Anaconda |
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| 23 | and PythonXY, or available stand alone. This toolchain has had |
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| 24 | difficulties on some systems, and may or may not work for you. |
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| 25 | |
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| 26 | You can control which compiler to use by setting SAS_COMPILER in the |
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| 27 | environment: |
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| 28 | |
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| 29 | - tinycc (Windows): use the TinyCC compiler shipped with SasView |
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| 30 | - msvc (Windows): use the Microsoft Visual C++ compiler |
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| 31 | - mingw (Windows): use the MinGW GNU cc compiler |
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| 32 | - unix (Linux): use the system cc compiler. |
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| 33 | - unix (Mac): use the clang compiler. You will need XCode installed, and |
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| 34 | the XCode command line tools. Mac comes with OpenCL drivers, so generally |
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| 35 | this will not be needed. |
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| 36 | |
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| 37 | Both *msvc* and *mingw* require that the compiler is available on your path. |
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| 38 | For *msvc*, this can done by running vcvarsall.bat in a windows terminal. |
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| 39 | Install locations are system dependent, such as: |
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[92da231] | 40 | |
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[2d81cfe] | 41 | C:\Program Files (x86)\Common Files\Microsoft\Visual |
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| 42 | C++ for Python\9.0\vcvarsall.bat |
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[92da231] | 43 | |
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| 44 | or maybe |
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| 45 | |
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[2d81cfe] | 46 | C:\Users\yourname\AppData\Local\Programs\Common\Microsoft\Visual |
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| 47 | C++ for Python\9.0\vcvarsall.bat |
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[92da231] | 48 | |
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[3764ec1] | 49 | OpenMP for *msvc* requires the Microsoft vcomp90.dll library, which doesn't |
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| 50 | seem to be included with the compiler, nor does there appear to be a public |
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| 51 | download location. There may be one on your machine already in a location |
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| 52 | such as: |
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[92da231] | 53 | |
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| 54 | C:\Windows\winsxs\x86_microsoft.vc90.openmp*\vcomp90.dll |
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| 55 | |
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[3764ec1] | 56 | If you copy this to somewhere on your path, such as the python directory or |
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| 57 | the install directory for this application, then OpenMP should be supported. |
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| 58 | |
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| 59 | For full control of the compiler, define a function |
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| 60 | *compile_command(source,output)* which takes the name of the source file |
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| 61 | and the name of the output file and returns a compile command that can be |
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| 62 | evaluated in the shell. For even more control, replace the entire |
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| 63 | *compile(source,output)* function. |
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| 64 | |
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| 65 | The global attribute *ALLOW_SINGLE_PRECISION_DLLS* should be set to *False* if |
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| 66 | you wish to prevent single precision floating point evaluation for the compiled |
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| 67 | models, otherwise set it defaults to *True*. |
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[14de349] | 68 | """ |
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[eafc9fa] | 69 | from __future__ import print_function |
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[750ffa5] | 70 | |
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[5d4777d] | 71 | import sys |
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| 72 | import os |
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[40a87fa] | 73 | from os.path import join as joinpath, splitext |
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[7e16db7] | 74 | import subprocess |
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[df4dc86] | 75 | import tempfile |
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[7ae2b7f] | 76 | import ctypes as ct # type: ignore |
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[886fa25] | 77 | import _ctypes as _ct |
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[821a9c6] | 78 | import logging |
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[14de349] | 79 | |
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[7ae2b7f] | 80 | import numpy as np # type: ignore |
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[14de349] | 81 | |
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[739aad4] | 82 | try: |
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| 83 | import tinycc |
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| 84 | except ImportError: |
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| 85 | tinycc = None |
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| 86 | |
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[cb6ecf4] | 87 | from . import generate |
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[f619de7] | 88 | from .kernel import KernelModel, Kernel |
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| 89 | from .kernelpy import PyInput |
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[2c801fe] | 90 | from .exception import annotate_exception |
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[f619de7] | 91 | from .generate import F16, F32, F64 |
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| 92 | |
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[2d81cfe] | 93 | # pylint: disable=unused-import |
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[f619de7] | 94 | try: |
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| 95 | from typing import Tuple, Callable, Any |
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| 96 | from .modelinfo import ModelInfo |
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| 97 | from .details import CallDetails |
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| 98 | except ImportError: |
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| 99 | pass |
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[2d81cfe] | 100 | # pylint: enable=unused-import |
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[14de349] | 101 | |
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[e44432d] | 102 | # Compiler output is a byte stream that needs to be decode in python 3 |
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| 103 | decode = (lambda s: s) if sys.version_info[0] < 3 else (lambda s: s.decode('utf8')) |
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| 104 | |
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[1a3559f] | 105 | if "SAS_DLL_PATH" in os.environ: |
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| 106 | SAS_DLL_PATH = os.environ["SAS_DLL_PATH"] |
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| 107 | else: |
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| 108 | # Assume the default location of module DLLs is in .sasmodels/compiled_models. |
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| 109 | SAS_DLL_PATH = os.path.join(os.path.expanduser("~"), ".sasmodels", "compiled_models") |
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| 110 | |
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[739aad4] | 111 | if "SAS_COMPILER" in os.environ: |
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[b2f1d2f] | 112 | COMPILER = os.environ["SAS_COMPILER"] |
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[739aad4] | 113 | elif os.name == 'nt': |
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[b2f1d2f] | 114 | if tinycc is not None: |
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| 115 | COMPILER = "tinycc" |
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| 116 | elif "VCINSTALLDIR" in os.environ: |
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| 117 | # If vcvarsall.bat has been called, then VCINSTALLDIR is in the environment |
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| 118 | # and we can use the MSVC compiler. Otherwise, if tinycc is available |
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| 119 | # the use it. Otherwise, hope that mingw is available. |
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| 120 | COMPILER = "msvc" |
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[fb69211] | 121 | else: |
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[b2f1d2f] | 122 | COMPILER = "mingw" |
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[5d4777d] | 123 | else: |
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[b2f1d2f] | 124 | COMPILER = "unix" |
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[739aad4] | 125 | |
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[886fa25] | 126 | ARCH = "" if ct.sizeof(ct.c_void_p) > 4 else "x86" # 4 byte pointers on x86 |
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[b2f1d2f] | 127 | if COMPILER == "unix": |
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[5efe850] | 128 | # Generic unix compile |
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| 129 | # On mac users will need the X code command line tools installed |
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[7e16db7] | 130 | #COMPILE = "gcc-mp-4.7 -shared -fPIC -std=c99 -fopenmp -O2 -Wall %s -o %s -lm -lgomp" |
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[aa343d6] | 131 | CC = "cc -shared -fPIC -std=c99 -O2 -Wall".split() |
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[5efe850] | 132 | # add openmp support if not running on a mac |
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[7e16db7] | 133 | if sys.platform != "darwin": |
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[33969b6] | 134 | # OpenMP seems to be broken on gcc 5.4.0 (ubuntu 16.04.9) |
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| 135 | # Shut it off for all unix until we can investigate. |
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| 136 | #CC.append("-fopenmp") |
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| 137 | pass |
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[7e16db7] | 138 | def compile_command(source, output): |
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[40a87fa] | 139 | """unix compiler command""" |
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[15e74ad] | 140 | return CC + [source, "-o", output, "-lm"] |
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[b2f1d2f] | 141 | elif COMPILER == "msvc": |
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[739aad4] | 142 | # Call vcvarsall.bat before compiling to set path, headers, libs, etc. |
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| 143 | # MSVC compiler is available, so use it. OpenMP requires a copy of |
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| 144 | # vcomp90.dll on the path. One may be found here: |
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| 145 | # C:/Windows/winsxs/x86_microsoft.vc90.openmp*/vcomp90.dll |
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| 146 | # Copy this to the python directory and uncomment the OpenMP COMPILE |
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| 147 | # TODO: remove intermediate OBJ file created in the directory |
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| 148 | # TODO: maybe don't use randomized name for the c file |
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| 149 | # TODO: maybe ask distutils to find MSVC |
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| 150 | CC = "cl /nologo /Ox /MD /W3 /GS- /DNDEBUG".split() |
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| 151 | if "SAS_OPENMP" in os.environ: |
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| 152 | CC.append("/openmp") |
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| 153 | LN = "/link /DLL /INCREMENTAL:NO /MANIFEST".split() |
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| 154 | def compile_command(source, output): |
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[40a87fa] | 155 | """MSVC compiler command""" |
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[739aad4] | 156 | return CC + ["/Tp%s"%source] + LN + ["/OUT:%s"%output] |
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[b2f1d2f] | 157 | elif COMPILER == "tinycc": |
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[739aad4] | 158 | # TinyCC compiler. |
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| 159 | CC = [tinycc.TCC] + "-shared -rdynamic -Wall".split() |
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| 160 | def compile_command(source, output): |
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[40a87fa] | 161 | """tinycc compiler command""" |
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[739aad4] | 162 | return CC + [source, "-o", output] |
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[b2f1d2f] | 163 | elif COMPILER == "mingw": |
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[739aad4] | 164 | # MinGW compiler. |
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| 165 | CC = "gcc -shared -std=c99 -O2 -Wall".split() |
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| 166 | if "SAS_OPENMP" in os.environ: |
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| 167 | CC.append("-fopenmp") |
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| 168 | def compile_command(source, output): |
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[40a87fa] | 169 | """mingw compiler command""" |
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[739aad4] | 170 | return CC + [source, "-o", output, "-lm"] |
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[df4dc86] | 171 | |
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[5d316e9] | 172 | ALLOW_SINGLE_PRECISION_DLLS = True |
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[5d4777d] | 173 | |
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[7e16db7] | 174 | def compile(source, output): |
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[40a87fa] | 175 | # type: (str, str) -> None |
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| 176 | """ |
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| 177 | Compile *source* producing *output*. |
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| 178 | |
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| 179 | Raises RuntimeError if the compile failed or the output wasn't produced. |
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| 180 | """ |
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[7e16db7] | 181 | command = compile_command(source=source, output=output) |
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| 182 | command_str = " ".join('"%s"'%p if ' ' in p else p for p in command) |
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| 183 | logging.info(command_str) |
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| 184 | try: |
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[15e74ad] | 185 | # need shell=True on windows to keep console box from popping up |
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| 186 | shell = (os.name == 'nt') |
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[aa343d6] | 187 | subprocess.check_output(command, shell=shell, stderr=subprocess.STDOUT) |
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[7e16db7] | 188 | except subprocess.CalledProcessError as exc: |
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[e44432d] | 189 | output = decode(exc.output) |
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| 190 | raise RuntimeError("compile failed.\n%s\n%s"%(command_str, output)) |
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[7e16db7] | 191 | if not os.path.exists(output): |
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| 192 | raise RuntimeError("compile failed. File is in %r"%source) |
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[750ffa5] | 193 | |
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[151f3bc] | 194 | def dll_name(model_info, dtype): |
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[f619de7] | 195 | # type: (ModelInfo, np.dtype) -> str |
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[5d4777d] | 196 | """ |
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[151f3bc] | 197 | Name of the dll containing the model. This is the base file name without |
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| 198 | any path or extension, with a form such as 'sas_sphere32'. |
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[5d4777d] | 199 | """ |
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[151f3bc] | 200 | bits = 8*dtype.itemsize |
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[56b2687] | 201 | basename = "sas%d_%s"%(bits, model_info.id) |
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[c7118f4] | 202 | basename += ARCH + ".so" |
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[01b8659] | 203 | |
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| 204 | # Hack to find precompiled dlls |
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[c7118f4] | 205 | path = joinpath(generate.DATA_PATH, '..', 'compiled_models', basename) |
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[01b8659] | 206 | if os.path.exists(path): |
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| 207 | return path |
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| 208 | |
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[1a3559f] | 209 | return joinpath(SAS_DLL_PATH, basename) |
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[5d4777d] | 210 | |
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[f619de7] | 211 | |
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[151f3bc] | 212 | def dll_path(model_info, dtype): |
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[f619de7] | 213 | # type: (ModelInfo, np.dtype) -> str |
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[151f3bc] | 214 | """ |
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| 215 | Complete path to the dll for the model. Note that the dll may not |
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| 216 | exist yet if it hasn't been compiled. |
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| 217 | """ |
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[1a3559f] | 218 | return os.path.join(SAS_DLL_PATH, dll_name(model_info, dtype)) |
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[5d4777d] | 219 | |
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[f619de7] | 220 | |
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| 221 | def make_dll(source, model_info, dtype=F64): |
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| 222 | # type: (str, ModelInfo, np.dtype) -> str |
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[5d4777d] | 223 | """ |
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[f619de7] | 224 | Returns the path to the compiled model defined by *kernel_module*. |
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[5d4777d] | 225 | |
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[f619de7] | 226 | If the model has not been compiled, or if the source file(s) are newer |
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| 227 | than the dll, then *make_dll* will compile the model before returning. |
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| 228 | This routine does not load the resulting dll. |
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[5d4777d] | 229 | |
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[aa4946b] | 230 | *dtype* is a numpy floating point precision specifier indicating whether |
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[f619de7] | 231 | the model should be single, double or long double precision. The default |
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| 232 | is double precision, *np.dtype('d')*. |
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[5d4777d] | 233 | |
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[f619de7] | 234 | Set *sasmodels.ALLOW_SINGLE_PRECISION_DLLS* to False if single precision |
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| 235 | models are not allowed as DLLs. |
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[aa4946b] | 236 | |
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[1a3559f] | 237 | Set *sasmodels.kerneldll.SAS_DLL_PATH* to the compiled dll output path. |
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| 238 | Alternatively, set the environment variable *SAS_DLL_PATH*. |
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[bf94e6e] | 239 | The default is in ~/.sasmodels/compiled_models. |
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[5d4777d] | 240 | """ |
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[f619de7] | 241 | if dtype == F16: |
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[5d316e9] | 242 | raise ValueError("16 bit floats not supported") |
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[f619de7] | 243 | if dtype == F32 and not ALLOW_SINGLE_PRECISION_DLLS: |
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| 244 | dtype = F64 # Force 64-bit dll |
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| 245 | # Note: dtype may be F128 for long double precision |
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[750ffa5] | 246 | |
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[17bbadd] | 247 | dll = dll_path(model_info, dtype) |
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[e1454ab] | 248 | |
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| 249 | if not os.path.exists(dll): |
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[5a91c6b] | 250 | need_recompile = True |
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| 251 | else: |
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| 252 | dll_time = os.path.getmtime(dll) |
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[0dc34c3] | 253 | newest_source = generate.dll_timestamp(model_info) |
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[5a91c6b] | 254 | need_recompile = dll_time < newest_source |
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| 255 | if need_recompile: |
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[bf94e6e] | 256 | # Make sure the DLL path exists |
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[1a3559f] | 257 | if not os.path.exists(SAS_DLL_PATH): |
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| 258 | os.makedirs(SAS_DLL_PATH) |
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[40a87fa] | 259 | basename = splitext(os.path.basename(dll))[0] + "_" |
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| 260 | system_fd, filename = tempfile.mkstemp(suffix=".c", prefix=basename) |
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[f619de7] | 261 | source = generate.convert_type(source, dtype) |
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[40a87fa] | 262 | with os.fdopen(system_fd, "w") as file_handle: |
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| 263 | file_handle.write(source) |
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[7e16db7] | 264 | compile(source=filename, output=dll) |
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| 265 | # comment the following to keep the generated c file |
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| 266 | # Note: if there is a syntax error then compile raises an error |
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| 267 | # and the source file will not be deleted. |
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[c036ddb] | 268 | os.unlink(filename) |
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| 269 | #print("saving compiled file in %r"%filename) |
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[aa4946b] | 270 | return dll |
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| 271 | |
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| 272 | |
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[f619de7] | 273 | def load_dll(source, model_info, dtype=F64): |
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| 274 | # type: (str, ModelInfo, np.dtype) -> "DllModel" |
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[aa4946b] | 275 | """ |
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[823e620] | 276 | Create and load a dll corresponding to the source, info pair returned |
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[aa4946b] | 277 | from :func:`sasmodels.generate.make` compiled for the target precision. |
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| 278 | |
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| 279 | See :func:`make_dll` for details on controlling the dll path and the |
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| 280 | allowed floating point precision. |
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| 281 | """ |
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[17bbadd] | 282 | filename = make_dll(source, model_info, dtype=dtype) |
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| 283 | return DllModel(filename, model_info, dtype=dtype) |
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[5d4777d] | 284 | |
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[f619de7] | 285 | |
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| 286 | class DllModel(KernelModel): |
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[14de349] | 287 | """ |
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| 288 | ctypes wrapper for a single model. |
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| 289 | |
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[17bbadd] | 290 | *source* and *model_info* are the model source and interface as returned |
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[14de349] | 291 | from :func:`gen.make`. |
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| 292 | |
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| 293 | *dtype* is the desired model precision. Any numpy dtype for single |
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| 294 | or double precision floats will do, such as 'f', 'float32' or 'single' |
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| 295 | for single and 'd', 'float64' or 'double' for double. Double precision |
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| 296 | is an optional extension which may not be available on all devices. |
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[ff7119b] | 297 | |
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| 298 | Call :meth:`release` when done with the kernel. |
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[14de349] | 299 | """ |
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[17bbadd] | 300 | def __init__(self, dllpath, model_info, dtype=generate.F32): |
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[f619de7] | 301 | # type: (str, ModelInfo, np.dtype) -> None |
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[17bbadd] | 302 | self.info = model_info |
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[ce27e21] | 303 | self.dllpath = dllpath |
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[f619de7] | 304 | self._dll = None # type: ct.CDLL |
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[40a87fa] | 305 | self._kernels = None # type: List[Callable, Callable] |
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[750ffa5] | 306 | self.dtype = np.dtype(dtype) |
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[14de349] | 307 | |
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[ce27e21] | 308 | def _load_dll(self): |
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[f619de7] | 309 | # type: () -> None |
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[2c801fe] | 310 | try: |
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[f619de7] | 311 | self._dll = ct.CDLL(self.dllpath) |
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[4d76711] | 312 | except: |
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| 313 | annotate_exception("while loading "+self.dllpath) |
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[2c801fe] | 314 | raise |
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[14de349] | 315 | |
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[886fa25] | 316 | float_type = (ct.c_float if self.dtype == generate.F32 |
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| 317 | else ct.c_double if self.dtype == generate.F64 |
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| 318 | else ct.c_longdouble) |
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[ce27e21] | 319 | |
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[a738209] | 320 | # int, int, int, int*, double*, double*, double*, double*, double |
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[6e7ba14] | 321 | argtypes = [ct.c_int32]*3 + [ct.c_void_p]*4 + [float_type, ct.c_int32] |
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[9eb3632] | 322 | names = [generate.kernel_name(self.info, variant) |
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| 323 | for variant in ("Iq", "Iqxy", "Imagnetic")] |
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| 324 | self._kernels = [self._dll[name] for name in names] |
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| 325 | for k in self._kernels: |
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| 326 | k.argtypes = argtypes |
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[ce27e21] | 327 | |
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| 328 | def __getstate__(self): |
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[f619de7] | 329 | # type: () -> Tuple[ModelInfo, str] |
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[eafc9fa] | 330 | return self.info, self.dllpath |
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[ce27e21] | 331 | |
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| 332 | def __setstate__(self, state): |
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[f619de7] | 333 | # type: (Tuple[ModelInfo, str]) -> None |
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[eafc9fa] | 334 | self.info, self.dllpath = state |
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[f619de7] | 335 | self._dll = None |
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[ce27e21] | 336 | |
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[48fbd50] | 337 | def make_kernel(self, q_vectors): |
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[f619de7] | 338 | # type: (List[np.ndarray]) -> DllKernel |
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[eafc9fa] | 339 | q_input = PyInput(q_vectors, self.dtype) |
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[f619de7] | 340 | # Note: pickle not supported for DllKernel |
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| 341 | if self._dll is None: |
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| 342 | self._load_dll() |
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[9eb3632] | 343 | is_2d = len(q_vectors) == 2 |
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| 344 | kernel = self._kernels[1:3] if is_2d else [self._kernels[0]]*2 |
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[3c56da87] | 345 | return DllKernel(kernel, self.info, q_input) |
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[4d76711] | 346 | |
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[eafc9fa] | 347 | def release(self): |
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[f619de7] | 348 | # type: () -> None |
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[14de349] | 349 | """ |
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[eafc9fa] | 350 | Release any resources associated with the model. |
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[14de349] | 351 | """ |
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[886fa25] | 352 | dll_handle = self._dll._handle |
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[6ad0e87] | 353 | if os.name == 'nt': |
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[40a87fa] | 354 | ct.windll.kernel32.FreeLibrary(dll_handle) |
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| 355 | else: |
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[886fa25] | 356 | _ct.dlclose(dll_handle) |
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| 357 | del self._dll |
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| 358 | self._dll = None |
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[14de349] | 359 | |
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[f619de7] | 360 | class DllKernel(Kernel): |
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[ff7119b] | 361 | """ |
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| 362 | Callable SAS kernel. |
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| 363 | |
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[b3f6bc3] | 364 | *kernel* is the c function to call. |
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[ff7119b] | 365 | |
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[17bbadd] | 366 | *model_info* is the module information |
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[ff7119b] | 367 | |
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[3c56da87] | 368 | *q_input* is the DllInput q vectors at which the kernel should be |
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[ff7119b] | 369 | evaluated. |
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| 370 | |
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| 371 | The resulting call method takes the *pars*, a list of values for |
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[823e620] | 372 | the fixed parameters to the kernel, and *pd_pars*, a list of (value, weight) |
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[ff7119b] | 373 | vectors for the polydisperse parameters. *cutoff* determines the |
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| 374 | integration limits: any points with combined weight less than *cutoff* |
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| 375 | will not be calculated. |
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| 376 | |
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| 377 | Call :meth:`release` when done with the kernel instance. |
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| 378 | """ |
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[17bbadd] | 379 | def __init__(self, kernel, model_info, q_input): |
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[f619de7] | 380 | # type: (Callable[[], np.ndarray], ModelInfo, PyInput) -> None |
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[01c8d9e] | 381 | #,model_info,q_input) |
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[48fbd50] | 382 | self.kernel = kernel |
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[17bbadd] | 383 | self.info = model_info |
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[3c56da87] | 384 | self.q_input = q_input |
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[39cc3be] | 385 | self.dtype = q_input.dtype |
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[445d1c0] | 386 | self.dim = '2d' if q_input.is_2d else '1d' |
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[c036ddb] | 387 | # leave room for f1/f2 results in case we need to compute beta for 1d models |
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[6e7ba14] | 388 | nout = 2 if self.info.have_Fq else 1 |
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[e44432d] | 389 | # +4 for total weight, shell volume, effective radius, form volume |
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| 390 | self.result = np.empty(q_input.nq*nout + 4, self.dtype) |
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[a5b8477] | 391 | self.real = (np.float32 if self.q_input.dtype == generate.F32 |
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| 392 | else np.float64 if self.q_input.dtype == generate.F64 |
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| 393 | else np.float128) |
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[14de349] | 394 | |
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[6e7ba14] | 395 | def _call_kernel(self, call_details, values, cutoff, magnetic, effective_radius_type): |
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| 396 | # type: (CallDetails, np.ndarray, np.ndarray, float, bool, int) -> np.ndarray |
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[9eb3632] | 397 | kernel = self.kernel[1 if magnetic else 0] |
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[303d8d6] | 398 | args = [ |
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| 399 | self.q_input.nq, # nq |
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[9eb3632] | 400 | None, # pd_start |
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| 401 | None, # pd_stop pd_stride[MAX_PD] |
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[8d62008] | 402 | call_details.buffer.ctypes.data, # problem |
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[01c8d9e] | 403 | values.ctypes.data, # pars |
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| 404 | self.q_input.q.ctypes.data, # q |
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[48fbd50] | 405 | self.result.ctypes.data, # results |
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[a5b8477] | 406 | self.real(cutoff), # cutoff |
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[6e7ba14] | 407 | effective_radius_type, # cutoff |
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[9eb3632] | 408 | ] |
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[c036ddb] | 409 | #print("Calling DLL") |
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[bde38b5] | 410 | #call_details.show(values) |
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[9eb3632] | 411 | step = 100 |
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[bde38b5] | 412 | for start in range(0, call_details.num_eval, step): |
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| 413 | stop = min(start + step, call_details.num_eval) |
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[9eb3632] | 414 | args[1:3] = [start, stop] |
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| 415 | kernel(*args) # type: ignore |
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| 416 | |
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[14de349] | 417 | def release(self): |
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[f619de7] | 418 | # type: () -> None |
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[eafc9fa] | 419 | """ |
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| 420 | Release any resources associated with the kernel. |
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| 421 | """ |
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[f619de7] | 422 | self.q_input.release() |
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