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Fix typos in big-bird.md #2392

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Fix typos in big-bird.md #2392

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6 changes: 3 additions & 3 deletions big-bird.md
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Original file line number Diff line number Diff line change
Expand Up @@ -179,11 +179,11 @@ Random attention is ensuring that each query token will attend a few random toke

```python
# r1, r2, r are some random indices; Note: r1, r2, r3 are different for each row 👇
Q[1] x [Q[r1], Q[r2], ......, Q[r]]
Q[1] x [K[r1], K[r2], ......, K[r]]
.
.
.
Q[n-2] x [Q[r1], Q[r2], ......, Q[r]]
Q[n-2] x [K[r1], K[r2], ......, K[r]]

# leaving 0th & (n-1)th token since they are already global
```
Expand All @@ -209,7 +209,7 @@ Attention score for \\(\mathbf{q}_{1}\\) represented by \\(a_1\\) where \\(a_1=S

---

For calculating attention score for tokens in seconcd block, we are gathering the first three blocks, the last block, and the fifth block. Then we can compute \\(a_2 = Softmax(q_2 * concat(k_1, k_2, k_3, k_5, k_7)\\).
For calculating attention score for tokens in second block, we are gathering the first three blocks, the last block, and the fifth block. Then we can compute \\(a_2 = Softmax(q_2 * concat(k_1, k_2, k_3, k_5, k_7)\\).

![BigBird block sparse attention](assets/18_big_bird/q2.png)

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