sudo_set_alpha_sigmoid_steepness
Call v273 → v277, v290 → current #68Sets the sigmoid steepness for alpha calculations.
View calls on chainCall Workflow
This diagram shows the call execution flow: starting with sudo_set_alpha_sigmoid_steepness, passing through validation
(signature, nonce, mortality, fee payment), then pre-dispatch checks, followed by dispatch and modifies storage: SubtensorModule.AlphaSigmoidSteepness, and finally post-dispatch where ExtrinsicSuccess is emitted and fees are settled.
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Used by: subnet owners
The Big Picture
The sigmoid function shapes how alpha values map. Steepness controls how sharp the transition is.
Use Cases
- Tuning alpha token curves
- Adjusting price sensitivity
Migration Notes
v277 v290 Breaking
steepness changed from u16 to i16
Update decoders: SCALE encoding is positional, so any signature change (added, removed, or type-changed fields, or storage shape changes) shifts byte offsets and existing decoders will misparse this item. Re-derive types from the new metadata.
Input Parameters
Permissions
Origin
Root
Required Role
Permission data inferred from metadata. May be incomplete.
Requirements
- Caller is root or subnet owner
- Subnet exists
- Value is positive
Effects
Storage Modified
Postconditions
- SigmoidSteepness updated
Side Effects
- Affects alpha curve shape
Code Examples
import { createClient, Binary } from "polkadot-api";
import { getWsProvider } from "polkadot-api/ws";
import { sub } from "@polkadot-api/descriptors"; // generated by: npx papi add sub -w wss://entrypoint-finney.opentensor.ai:443
const client = createClient(getWsProvider("wss://entrypoint-finney.opentensor.ai:443"));
const api = client.getTypedApi(sub);
// Build sudo_set_alpha_sigmoid_steepness call (typed, named args)
const netuid = 1;
const steepness = 0;
const tx = api.tx.AdminUtils.sudo_set_alpha_sigmoid_steepness({
netuid,
steepness,
});Version History
v273 block 5,659,032 2 args
v290 block 5,947,548 2 args Current
Runtime Info
View Source- Pallet Index
- 19
- Call Index
- 68
- First Version
- v273
- Current Version
- v411