add caches there (#3042)

* add caches there

* no curl

.github/workflows/test.yml

@@ -97,7 +97,7 @@ jobs:
     - name: Compile C to native
       run: clang -O2 recognize.c -lm -o recognize
     - name: Test EfficientNet
-      run: curl https://media.istockphoto.com/photos/hen-picture-id831791190 | ./recognize | grep hen
+      run: cat test/models/efficientnet/Chicken.jpg | ./recognize | grep cock
 
   testtorch:
     name: Torch Tests

tinygrad/shape/view.py

@@ -82,10 +82,12 @@ class View:
     contiguous = offset == 0 and mask is None and strides == strides_for_shape(shape)
     return View(shape, strides, offset, mask, contiguous)
 
+  @functools.lru_cache(None)  # pylint: disable=method-cache-max-size-none
   def vars(self) -> Set[Variable]:
     flatten_mask = tuple(x for m in self.mask for x in m) if self.mask is not None else tuple()
     return functools.reduce(operator.or_, [x.vars() for x in self.shape+self.strides+(self.offset,)+flatten_mask if isinstance(x, Node)], set())
 
+  @functools.lru_cache(None)  # pylint: disable=method-cache-max-size-none
   def unbind(self) -> View:
     unbound_vars:Dict[Variable,Node] = {v: v.unbind()[0] for v in self.vars() if v.val is not None}
     new_shape = tuple([s if isinstance(s, int) else s.substitute(unbound_vars) for s in self.shape])