Add python/cython benchmark for the lark parser

Author: Erotemic

benchmarks/benchmark_lark_parser.py

@@ -0,0 +1,199 @@
+"""
+Based on:
+    https://github.com/Erotemic/misc/blob/main/tests/python/bench_template.py
+
+Requirements:
+    pip install ubelt timerit pandas numpy seaborn matplotlib
+"""
+
+
+def random_lark_grammar(size):
+    """
+    TODO: could likely be more sophisticated with how we *generate* random
+    text. (Almost as if that's what CFGs do!).
+    """
+    lines = [
+        'start: final',
+        'simple_rule_0 : CNAME'
+    ]
+    idx = 0
+    for idx in range(1, size):
+        lines.append(f'simple_rule_{idx} : "(" simple_rule_{idx - 1} ")"')
+
+    lines.append(f'final : simple_rule_{idx} "."')
+    lines.append('%import common.CNAME')
+    text = '\n'.join(lines)
+    return text
+
+
+def _autompl_lite():
+    """
+    A minimal port of :func:`kwplot.autompl`
+
+    References:
+        https://gitlab.kitware.com/computer-vision/kwplot/-/blob/main/kwplot/auto_backends.py#L98
+    """
+    import ubelt as ub
+    import matplotlib as mpl
+    interactive = False
+    if ub.modname_to_modpath('PyQt5'):
+        # Try to use PyQt Backend
+        mpl.use('Qt5Agg')
+        try:
+            __IPYTHON__
+        except NameError:
+            pass
+        else:
+            import IPython
+            ipython = IPython.get_ipython()
+            ipython.magic('pylab qt5 --no-import-all')
+            interactive = True
+    return interactive
+
+
+def benchmark():
+    import ubelt as ub
+    import pandas as pd
+    import timerit
+    import numpy as np
+    import lark
+    import lark_cython
+
+    grammar_fpath = ub.Path(lark.__file__).parent / 'grammars/lark.lark'
+    grammar_text = grammar_fpath.read_text()
+
+    cython_parser = lark.Lark(grammar_text,  start='start', parser='lalr', _plugins=lark_cython.plugins)
+    python_parser = lark.Lark(grammar_text,  start='start', parser='lalr')
+
+    def parse_cython(text):
+        cython_parser.parse(text)
+
+    def parse_python(text):
+        python_parser.parse(text)
+
+    method_lut = locals()  # can populate this some other way
+
+    # Change params here to modify number of trials
+    ti = timerit.Timerit(300, bestof=10, verbose=1)
+
+    # if True, record every trail run and show variance in seaborn
+    # if False, use the standard timerit min/mean measures
+    RECORD_ALL = True
+
+    # These are the parameters that we benchmark over
+    basis = {
+        'method': [
+            'parse_python',
+            'parse_cython',
+        ],
+        'size': np.linspace(16, 512, 8).round().astype(int),
+    }
+    xlabel = 'size'
+    # Set these to param labels that directly transfer to method kwargs
+    kw_labels = []
+    # Set these to empty lists if they are not used
+    group_labels = {
+        'style': [],
+        'size': [],
+    }
+    group_labels['hue'] = list(
+        (ub.oset(basis) - {xlabel}) - set.union(*map(set, group_labels.values())))
+    grid_iter = list(ub.named_product(basis))
+
+    # For each variation of your experiment, create a row.
+    rows = []
+    for params in grid_iter:
+        group_keys = {}
+        for gname, labels in group_labels.items():
+            group_keys[gname + '_key'] = ub.repr2(
+                ub.dict_isect(params, labels), compact=1, si=1)
+        key = ub.repr2(params, compact=1, si=1)
+        # Make any modifications you need to compute input kwargs for each
+        # method here.
+        kwargs = ub.dict_isect(params.copy(),  kw_labels)
+        kwargs['text'] = random_lark_grammar(params['size'])
+        method = method_lut[params['method']]
+        # Timerit will run some user-specified number of loops.
+        # and compute time stats with similar methodology to timeit
+        for timer in ti.reset(key):
+            # Put any setup logic you dont want to time here.
+            # ...
+            with timer:
+                # Put the logic you want to time here
+                method(**kwargs)
+        if RECORD_ALL:
+            # Seaborn will show the variance if this is enabled, otherwise
+            # use the robust timerit mean / min times
+            chunk_iter = ub.chunks(ti.times, ti.bestof)
+            times = list(map(min, chunk_iter))
+            for time in times:
+                row = {
+                    # 'mean': ti.mean(),
+                    'time': time,
+                    'key': key,
+                    **group_keys,
+                    **params,
+                }
+                rows.append(row)
+        else:
+            row = {
+                'mean': ti.mean(),
+                'min': ti.min(),
+                'key': key,
+                **group_keys,
+                **params,
+            }
+            rows.append(row)
+
+    time_key = 'time' if RECORD_ALL else 'min'
+
+    # The rows define a long-form pandas data array.
+    # Data in long-form makes it very easy to use seaborn.
+    data = pd.DataFrame(rows)
+    data = data.sort_values(time_key)
+    print(data)
+
+    if RECORD_ALL:
+        # Show the min / mean if we record all
+        min_times = data.groupby('key').min().rename({'time': 'min'}, axis=1)
+        mean_times = data.groupby('key')[['time']].mean().rename({'time': 'mean'}, axis=1)
+        stats_data = pd.concat([min_times, mean_times], axis=1)
+        stats_data = stats_data.sort_values('min')
+        print('Statistics:')
+        print(stats_data)
+
+    plot = True
+    if plot:
+        # import seaborn as sns
+        # kwplot autosns works well for IPython and script execution.
+        # not sure about notebooks.
+        interactive = _autompl_lite()
+        import seaborn as sns
+        from matplotlib import pyplot as plt
+        sns.set()
+
+        plotkw = {}
+        for gname, labels in group_labels.items():
+            if labels:
+                plotkw[gname] = gname + '_key'
+
+        # Your variables may change
+        fig = plt.figure()
+        fig.clf()
+        ax = fig.gca()
+        sns.lineplot(data=data, x=xlabel, y=time_key, marker='o', ax=ax, **plotkw)
+        ax.set_title('Benchmark Python Grammar')
+        ax.set_xlabel('Input Size')
+        ax.set_ylabel('Time (seconds)')
+        # ax.set_xscale('log')
+        # ax.set_yscale('log')
+        if not interactive:
+            plt.show()
+
+
+if __name__ == '__main__':
+    """
+    CommandLine:
+        python benchmarks/benchmark_lark_parser.py
+    """
+    benchmark()