if dropout > 0.0 disable Flash until pytorch fix. don't assert fail sigh

Author: karpathy

model.py

@@ -49,9 +49,9 @@ def __init__(self, config):
         self.n_embd = config.n_embd
         self.dropout = config.dropout
         # flash attention make GPU go brrrrr but support is only in PyTorch nightly and still a bit scary
-        self.flash = hasattr(torch.nn.functional, 'scaled_dot_product_attention')
+        self.flash = hasattr(torch.nn.functional, 'scaled_dot_product_attention') and self.dropout == 0.0
         if not self.flash:
-            print("WARNING: using slow attention, install PyTorch nightly for fast Flash Attention")
+            print("WARNING: using slow attention. Flash Attention atm needs PyTorch nightly and dropout=0.0")
             # causal mask to ensure that attention is only applied to the left in the input sequence
             self.register_buffer("bias", torch.tril(torch.ones(config.block_size, config.block_size))
                                         .view(1, 1, config.block_size, config.block_size))
@@ -68,7 +68,6 @@ def forward(self, x):
         # causal self-attention; Self-attend: (B, nh, T, hs) x (B, nh, hs, T) -> (B, nh, T, T)
         if self.flash:
             # efficient attention using Flash Attention CUDA kernels
-            assert self.dropout == 0.0, "need dropout=0.0 for now, PyTorch team is working on fix in #92917"
             y = torch.nn.functional.scaled_dot_product_attention(q, k, v, attn_mask=None, dropout_p=self.dropout, is_causal=True)
         else:
             # manual implementation of attention