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Implement loop splitting in cat #2

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Implement loop splitting in cat #2

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27 changes: 23 additions & 4 deletions tinygrad/tensor.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1309,11 +1309,30 @@ def cat(self:Tensor, *args:Tensor, dim:int=0) -> Tensor:
```
"""
dim = self._resolve_dim(dim)
for arg in args: assert arg.ndim==self.ndim and all(ti==ai for i,(ti,ai) in enumerate(zip(self.shape, arg.shape)) if i!=dim)
for arg in args: assert arg.ndim == self.ndim and all(ti == ai for i,(ti,ai) in enumerate(zip(self.shape, arg.shape)) if i != dim)
tensors = [self, *args]
dim_cumsum = list(itertools.accumulate([t.shape[dim] for t in tensors], initial=0))
for i,t in enumerate(tensors): tensors[i] = t.pad([(dim_cumsum[i], dim_cumsum[-1]-dim_cumsum[i+1]) if j==dim else None for j in range(t.ndim)])
return functools.reduce(Tensor.add, tensors)

def _cat_impl(ts: list[Tensor]) -> Tensor:
dim_cumsum = list(itertools.accumulate([t.shape[dim] for t in ts], initial=0))
for i,t in enumerate(ts):
ts[i] = t.pad([(dim_cumsum[i], dim_cumsum[-1]-dim_cumsum[i+1]) if j == dim else None for j in range(t.ndim)])
return functools.reduce(Tensor.add, ts)

if all_int([t.shape[dim] for t in tensors]):
SPLIT = 256
if sum(t.shape[dim] for t in tensors) > SPLIT:
out, cur, sz = [], [], 0
for t in tensors:
if sz and sz + t.shape[dim] > SPLIT:
out.append(_cat_impl(cur))
cur, sz = [], 0
cur.append(t)
sz += t.shape[dim]
if cur:
out.append(_cat_impl(cur))
return Tensor.cat(*out, dim=dim) if len(out) > 1 else out[0]

return _cat_impl(tensors)

def stack(self:Tensor, *args:Tensor, dim:int=0) -> Tensor:
"""
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