Queried by: validatorsdeveloperssubnet owners
The Big Picture
Validators must evaluate a minimum number of neurons. This prevents validators from focusing on only a few favorites and ensures broader consensus participation. Sparse weight matrices would undermine the distributed evaluation system.
Why This Matters
Setting weights? You must weight at least this many neurons. Too few weights = rejected submission. Ensures validators actually evaluate the network.
Example Scenario
Query MinAllowedWeights(netuid=1) returns 100. Your set_weights call must include at least 100 UIDs. Setting weights on only 50 neurons will fail.
Common Questions
- What if there aren't enough neurons?
- If SubnetworkN < MinAllowedWeights, you weight all neurons. The minimum is capped by actual neuron count.
- Can I weight UIDs with zero weight?
- Typically yes - zero weight still counts toward the minimum. You're evaluating them as 'not worthy' rather than ignoring them.
Use Cases
- Check minimum weights required before setting
- Build weight validation in validator software
- Understand consensus participation requirements
- Debug weight rejection errors
- Design subnet weight parameters
From Chain Metadata
MAP ( netuid ) --> min_allowed_weights
Purpose & Usage
Purpose
Prevent sparse weight matrices - validators must evaluate at least this many neurons.
Common Query Patterns
- Query by netuid
- Validate weight submissions
- Plan weight-setting strategy
Query Keys
| # | Name | Type | Description |
|---|---|---|---|
| 1 | netuid | u16 | netuid (u16, hashed key component) |
Stored Value
min_allowed_weights (u16)
Relationships
Modified By
Related Events
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);
// Query MinAllowedWeights storage
const netuid = 1;
const result = await api.query.SubtensorModule.MinAllowedWeights.getValue(netuid);
console.log("MinAllowedWeights:", result);Version History
v101 block 1 Added
v123 block 720,235 Internal re-bind
v149 block 3,014,339 Internal re-bind
v166–v194 · runtime versions skipped on chain (never deployed)
v195 block 3,791,350 Internal re-bind
v278–v289 · runtime versions skipped on chain (never deployed)
v290 block 5,947,548 Internal re-bind Current
Runtime Info
View Source- Pallet
- SubtensorModule
- Storage Kind
- Map
- First Version
- v101
- Current Version
- v411