Example of numba codegen from string

numba_codegen_from_string.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "import numpy as np\n",
    "import numba as nb"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "def gen_code(p1, p2, verbose=False):\n",
    "    code_template = '''\\\n",
    "def func(x):\n",
    "    s = {p1} * x[0]\n",
    "    for k in xrange(1, x.shape[0]):\n",
    "        s += {p2} * x[k]\n",
    "\n",
    "    return s\n",
    "'''\n",
    "\n",
    "    code_str = code_template.format(**dict(p1=p1, p2=p2)).strip()\n",
    "    if verbose:\n",
    "        print code_str\n",
    "\n",
    "    localf = {}\n",
    "    code = compile(code_str, '<>', 'exec')\n",
    "    eval(code, localf)\n",
    "\n",
    "    return localf['func']"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "def func(x):\n",
      "    s = 3.0 * x[0]\n",
      "    for k in xrange(1, x.shape[0]):\n",
      "        s += 6.0 * x[k]\n",
      "\n",
      "    return s\n"
     ]
    }
   ],
   "source": [
    "func = gen_code(3.0, 6.0, verbose=True)\n",
    "fastfunc = nb.jit(nopython=True)(func)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "27.0"
      ]
     },
     "execution_count": 18,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "func(np.ones(5))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "27.0\n"
     ]
    }
   ],
   "source": [
    "print fastfunc(np.ones(5))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
 ],
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    "version": 2
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