I’m not able to view my inference results via show_results(). I get a AssertionError: Match length mismatch if I try to do a learner.show_results(). I’d really like to get an idea of where to look for my error!
628 if self.display:
629 print("Saved as " + self.name)
--> 630 self.learner.show_results()
631 plt.show()
632
/usr/local/lib/python3.6/dist-packages/fastai2/learner.py in show_results(self, ds_idx, dl, max_n, shuffle, **kwargs)
253 b = dl.one_batch()
254 _,_,preds = self.get_preds(dl=[b], with_decoded=True)
--> 255 self.dls.show_results(b, preds, max_n=max_n, **kwargs)
256
257 def show_training_loop(self):
/usr/local/lib/python3.6/dist-packages/fastai2/data/core.py in show_results(self, b, out, max_n, ctxs, show, **kwargs)
103 x,y,its = self.show_batch(b, max_n=max_n, show=False)
104 b_out = type(b)(b[:self.n_inp] + (tuple(out) if is_listy(out) else (out,)))
--> 105 x1,y1,outs = self.show_batch(b_out, max_n=max_n, show=False)
106 res = (x,x1,None,None) if its is None else (x, y, its, outs.itemgot(slice(self.n_inp,None)))
107 if not show: return res
/usr/local/lib/python3.6/dist-packages/fastai2/data/core.py in show_batch(self, b, max_n, ctxs, show, unique, **kwargs)
96 self.get_idxs = lambda: Inf.zeros
97 if b is None: b = self.one_batch()
---> 98 if not show: return self._pre_show_batch(b, max_n=max_n)
99 show_batch(*self._pre_show_batch(b, max_n=max_n), ctxs=ctxs, max_n=max_n, **kwargs)
100 if unique: self.get_idxs = old_get_idxs
/usr/local/lib/python3.6/dist-packages/fastai2/data/core.py in _pre_show_batch(self, b, max_n)
87 b = self.decode(b)
88 if hasattr(b, 'show'): return b,None,None
---> 89 its = self._decode_batch(b, max_n, full=False)
90 if not is_listy(b): b,its = [b],L((o,) for o in its)
91 return detuplify(b[:self.n_inp]),detuplify(b[self.n_inp:]),its
/usr/local/lib/python3.6/dist-packages/fastai2/data/core.py in _decode_batch(self, b, max_n, full)
81 f = self.after_item.decode
82 f = compose(f, partial(getattr(self.dataset,'decode',noop), full = full))
---> 83 return L(batch_to_samples(b, max_n=max_n)).map(f)
84
85 def _pre_show_batch(self, b, max_n=9):
/usr/local/lib/python3.6/dist-packages/fastcore/foundation.py in map(self, f, *args, **kwargs)
375 else f.format if isinstance(f,str)
376 else f.__getitem__)
--> 377 return self._new(map(g, self))
378
379 def filter(self, f, negate=False, **kwargs):
/usr/local/lib/python3.6/dist-packages/fastcore/foundation.py in _new(self, items, *args, **kwargs)
325 @property
326 def _xtra(self): return None
--> 327 def _new(self, items, *args, **kwargs): return type(self)(items, *args, use_list=None, **kwargs)
328 def __getitem__(self, idx): return self._get(idx) if is_indexer(idx) else L(self._get(idx), use_list=None)
329 def copy(self): return self._new(self.items.copy())
/usr/local/lib/python3.6/dist-packages/fastcore/foundation.py in __call__(cls, x, *args, **kwargs)
45 return x
46
---> 47 res = super().__call__(*((x,) + args), **kwargs)
48 res._newchk = 0
49 return res
/usr/local/lib/python3.6/dist-packages/fastcore/foundation.py in __init__(self, items, use_list, match, *rest)
316 if items is None: items = []
317 if (use_list is not None) or not _is_array(items):
--> 318 items = list(items) if use_list else _listify(items)
319 if match is not None:
320 if is_coll(match): match = len(match)
/usr/local/lib/python3.6/dist-packages/fastcore/foundation.py in _listify(o)
252 if isinstance(o, list): return o
253 if isinstance(o, str) or _is_array(o): return [o]
--> 254 if is_iter(o): return list(o)
255 return [o]
256
/usr/local/lib/python3.6/dist-packages/fastcore/foundation.py in __call__(self, *args, **kwargs)
218 if isinstance(v,_Arg): kwargs[k] = args.pop(v.i)
219 fargs = [args[x.i] if isinstance(x, _Arg) else x for x in self.pargs] + args[self.maxi+1:]
--> 220 return self.fn(*fargs, **kwargs)
221
222 # Cell
/usr/local/lib/python3.6/dist-packages/fastcore/utils.py in _inner(x, *args, **kwargs)
347 if order is not None: funcs = funcs.sorted(order)
348 def _inner(x, *args, **kwargs):
--> 349 for f in L(funcs): x = f(x, *args, **kwargs)
350 return x
351 return _inner
/usr/local/lib/python3.6/dist-packages/fastai2/data/core.py in decode(self, o, full)
295 def __iter__(self): return (self[i] for i in range(len(self)))
296 def __repr__(self): return coll_repr(self)
--> 297 def decode(self, o, full=True): return tuple(tl.decode(o_, full=full) for o_,tl in zip(o,tuplify(self.tls, match=o)))
298 def subset(self, i): return type(self)(tls=L(tl.subset(i) for tl in self.tls), n_inp=self.n_inp)
299 def _new(self, items, *args, **kwargs): return super()._new(items, tfms=self.tfms, do_setup=False, **kwargs)
/usr/local/lib/python3.6/dist-packages/fastcore/utils.py in tuplify(o, use_list, match)
133 def tuplify(o, use_list=False, match=None):
134 "Make `o` a tuple"
--> 135 return tuple(L(o, use_list=use_list, match=match))
136
137 # Cell
/usr/local/lib/python3.6/dist-packages/fastcore/foundation.py in __call__(cls, x, *args, **kwargs)
45 return x
46
---> 47 res = super().__call__(*((x,) + args), **kwargs)
48 res._newchk = 0
49 return res
/usr/local/lib/python3.6/dist-packages/fastcore/foundation.py in __init__(self, items, use_list, match, *rest)
320 if is_coll(match): match = len(match)
321 if len(items)==1: items = items*match
--> 322 else: assert len(items)==match, 'Match length mismatch'
323 super().__init__(items)
324
AssertionError: Match length mismatch