create_bootstrap_key
Engine.create_bootstrap_key(secret_key, stage_count=3, size="medium")- Creates a bootstrap key for bootstrapping. Requires a secret key. The bootstrap key is internally composed of fixed rotation keys for bootstrapping.
- Input
- SecretKey
- stage_count: optional
- Specifies the number of levels used in coefficient to the slot function and the slot to coefficient function of bootstrapping algorithm. The default value is 3, and values from 3 to 5 are supported. The larger the stage count, the faster the bootstrapping, but the lower the level of the final result.
- size: optional
- Specifies the size of the bootstrap key. The larger the bootstrap key, the faster the bootstrap operation.
medium and large are supported. The default value is set to medium.
- Output
from desilofhe import Engine
engine = Engine(for_bootstrap=True)
secret_key = engine.create_secret_key()
bootstrap_key = engine.create_bootstrap_key(secret_key)
medium_bootstrap_key_with_5_stages = engine.create_bootstrap_key(
secret_key, stage_count=5
)
large_bootstrap_key = engine.create_bootstrap_key(secret_key, size="large")
large_bootstrap_key_with_4_stages = engine.create_bootstrap_key(
secret_key, count=4, size="large"
)
Key Sizes
| stage_count |
3 |
4 |
5 |
| medium |
12.3 GB |
9.1 GB |
7.0 GB |
| large |
15.2 GB |
12.9 GB |
8.9 GB |
Stage Count
Stage counts of 3, 4, and 5 are supported by default.
For sparse bootstrapping, the following values are supported.
| key_size |
slot_count |
1 |
2 |
3 |
4 |
5 |
| medium |
1 |
✅ |
|
|
|
|
| medium |
2 |
✅ |
|
|
|
|
| medium |
3 |
✅ |
|
|
|
|
| medium |
4 |
✅ |
✅ |
|
|
|
| medium |
5 |
✅ |
✅ |
|
|
|
| medium |
6 |
|
✅ |
|
|
|
| medium |
7 |
|
✅ |
✅ |
|
|
| medium |
8 |
|
✅ |
✅ |
|
|
| medium |
9 |
|
✅ |
✅ |
|
|
| medium |
10 |
|
✅ |
✅ |
✅ |
|
| medium |
11 |
|
|
✅ |
✅ |
|
| medium |
12 |
|
|
✅ |
✅ |
|
| medium |
13 |
|
|
✅ |
✅ |
✅ |
| medium |
14 |
|
|
✅ |
✅ |
✅ |
| large |
3 |
✅ |
|
|
|
|
| large |
4 |
✅ |
|
|
|
|
| large |
5 |
✅ |
|
|
|
|
| large |
6 |
|
✅ |
|
|
|
| large |
7 |
|
✅ |
|
|
|
| large |
8 |
|
✅ |
|
|
|
| large |
9 |
|
✅ |
✅ |
|
|
| large |
10 |
|
✅ |
✅ |
|
|
| large |
11 |
|
|
✅ |
|
|
| large |
12 |
|
|
✅ |
✅ |
|
| large |
13 |
|
|
✅ |
✅ |
|
| large |
14 |
|
|
✅ |
✅ |
|