from __future__ import absolute_import, division, print_function import re import os from functools import partial from .compatibility import apply from .core import istask, get_dependencies, ishashable from .utils import funcname, import_required, key_split graphviz = import_required("graphviz", "Drawing dask graphs requires the " "`graphviz` python library and the " "`graphviz` system library to be " "installed.") def task_label(task): """Label for a task on a dot graph. Examples -------- >>> from operator import add >>> task_label((add, 1, 2)) 'add' >>> task_label((add, (add, 1, 2), 3)) 'add(...)' """ func = task[0] if func is apply: func = task[1] if hasattr(func, 'funcs'): if len(func.funcs) > 1: return '{0}(...)'.format(funcname(func.funcs[0])) else: head = funcname(func.funcs[0]) else: head = funcname(func) if any(has_sub_tasks(i) for i in task[1:]): return '{0}(...)'.format(head) else: return head def has_sub_tasks(task): """Returns True if the task has sub tasks""" if istask(task): return True elif isinstance(task, list): return any(has_sub_tasks(i) for i in task) else: return False def name(x): try: return str(hash(x)) except TypeError: return str(hash(str(x))) _HASHPAT = re.compile('([0-9a-z]{32})') _UUIDPAT = re.compile('([0-9a-z]{8}-[0-9a-z]{4}-[0-9a-z]{4}-[0-9a-z]{4}-[0-9a-z]{12})') def label(x, cache=None): """ >>> label('x') 'x' >>> label(('x', 1)) "('x', 1)" >>> from hashlib import md5 >>> x = 'x-%s-hello' % md5(b'1234').hexdigest() >>> x 'x-81dc9bdb52d04dc20036dbd8313ed055-hello' >>> label(x) 'x-#-hello' >>> from uuid import uuid1 >>> x = 'x-%s-hello' % uuid1() >>> x # doctest: +SKIP 'x-4c1a3d7e-0b45-11e6-8334-54ee75105593-hello' >>> label(x) 'x-#-hello' """ s = str(x) for pattern in (_HASHPAT, _UUIDPAT): m = re.search(pattern, s) if m is not None: for h in m.groups(): if cache is not None: n = cache.get(h, len(cache)) label = '#{0}'.format(n) # cache will be overwritten destructively cache[h] = n else: label = '#' s = s.replace(h, label) return s def box_label(key): """ Label boxes in graph by chunk index >>> box_label(('x', 1, 2, 3)) '(1, 2, 3)' >>> box_label(('x', 123)) '123' >>> box_label('x') '' """ if isinstance(key, tuple): key = key[1:] if len(key) == 1: [key] = key return str(key) else: return "" def to_graphviz(dsk, data_attributes=None, function_attributes=None, rankdir='BT', graph_attr={}, node_attr=None, edge_attr=None, **kwargs): if data_attributes is None: data_attributes = {} if function_attributes is None: function_attributes = {} graph_attr = graph_attr or {} graph_attr['rankdir'] = rankdir graph_attr.update(kwargs) g = graphviz.Digraph(graph_attr=graph_attr, node_attr=node_attr, edge_attr=edge_attr) seen = set() for k, v in dsk.items(): k_name = name(k) if k_name not in seen: seen.add(k_name) attrs = data_attributes.get(k, {}) attrs.setdefault('label', box_label(k)) attrs.setdefault('shape', 'box') g.node(k_name, **attrs) if istask(v): func_name = name((k, 'function')) if func_name not in seen: seen.add(func_name) attrs = function_attributes.get(k, {}) attrs.setdefault('label', key_split(k)) attrs.setdefault('shape', 'circle') g.node(func_name, **attrs) g.edge(func_name, k_name) for dep in get_dependencies(dsk, k): dep_name = name(dep) if dep_name not in seen: seen.add(dep_name) attrs = data_attributes.get(dep, {}) attrs.setdefault('label', box_label(dep)) attrs.setdefault('shape', 'box') g.node(dep_name, **attrs) g.edge(dep_name, func_name) elif ishashable(v) and v in dsk: g.edge(name(v), k_name) return g IPYTHON_IMAGE_FORMATS = frozenset(['jpeg', 'png']) IPYTHON_NO_DISPLAY_FORMATS = frozenset(['dot', 'pdf']) def _get_display_cls(format): """ Get the appropriate IPython display class for `format`. Returns `IPython.display.SVG` if format=='svg', otherwise `IPython.display.Image`. If IPython is not importable, return dummy function that swallows its arguments and returns None. """ dummy = lambda *args, **kwargs: None try: import IPython.display as display except ImportError: # Can't return a display object if no IPython. return dummy if format in IPYTHON_NO_DISPLAY_FORMATS: # IPython can't display this format natively, so just return None. return dummy elif format in IPYTHON_IMAGE_FORMATS: # Partially apply `format` so that `Image` and `SVG` supply a uniform # interface to the caller. return partial(display.Image, format=format) elif format == 'svg': return display.SVG else: raise ValueError("Unknown format '%s' passed to `dot_graph`" % format) def dot_graph(dsk, filename='mydask', format=None, **kwargs): """ Render a task graph using dot. If `filename` is not None, write a file to disk with that name in the format specified by `format`. `filename` should not include an extension. Parameters ---------- dsk : dict The graph to display. filename : str or None, optional The name (without an extension) of the file to write to disk. If `filename` is None, no file will be written, and we communicate with dot using only pipes. Default is 'mydask'. format : {'png', 'pdf', 'dot', 'svg', 'jpeg', 'jpg'}, optional Format in which to write output file. Default is 'png'. **kwargs Additional keyword arguments to forward to `to_graphviz`. Returns ------- result : None or IPython.display.Image or IPython.display.SVG (See below.) Notes ----- If IPython is installed, we return an IPython.display object in the requested format. If IPython is not installed, we just return None. We always return None if format is 'pdf' or 'dot', because IPython can't display these formats natively. Passing these formats with filename=None will not produce any useful output. See Also -------- dask.dot.to_graphviz """ g = to_graphviz(dsk, **kwargs) return graphviz_to_file(g, filename, format) def graphviz_to_file(g, filename, format): fmts = ['.png', '.pdf', '.dot', '.svg', '.jpeg', '.jpg'] if format is None and any(filename.lower().endswith(fmt) for fmt in fmts): filename, format = os.path.splitext(filename) format = format[1:].lower() if format is None: format = 'png' data = g.pipe(format=format) if not data: raise RuntimeError("Graphviz failed to properly produce an image. " "This probably means your installation of graphviz " "is missing png support. See: " "https://github.com/ContinuumIO/anaconda-issues/" "issues/485 for more information.") display_cls = _get_display_cls(format) if not filename: return display_cls(data=data) full_filename = '.'.join([filename, format]) with open(full_filename, 'wb') as f: f.write(data) return display_cls(filename=full_filename)