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feat(BNNBot): 10-tick sliding window of enemy data + self state — 870 bits total

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Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Davide Cappellini
2026-09-17 23:35:57 +02:00
parent 89f63540bc
commit 50e3c6fae9
2 changed files with 122 additions and 84 deletions
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BNNBot_garage/src/BNNBot.nim
+59 -41
View File
@@ -1,5 +1,5 @@
# BNNBot — binary encoding data collector.
# Radar lock on enemy, converts each scan to a 44-bit BinaryVector, prints it.
# Radar lock on enemy, encodes a 10-tick sliding window (870 bits), prints it.
# No aiming, no firing — pure scan visualization for BNN research.
import std/[math, os, strutils]
@@ -11,56 +11,73 @@ const botJsonPath = currentSourcePath().parentDir / "BNNBot.json"
type
BNNBot = ref object of Bot
hasContact: bool
hasContact: bool
enemyBearing: float
lastEnemyX: float
lastEnemyY: float
hasLastPos: bool
velocity: float # signed velocity (from heading + speed)
heading: float # enemy heading (degrees)
distance: float
tick: int
prevVec: BinaryVector
hasPrev: bool
lastEnemyX: float
lastEnemyY: float
hasLastPos: bool
velocity: float
heading: float
distance: float
tick: int
prevVec: BinaryVector
hasPrev: bool
frameBuffer: array[WINDOW_SIZE, array[FRAME_BITS, uint8]]
bufferCount: int
method onScannedBot*(bot: BNNBot, e: ScannedBotEvent) =
let bx = getX(); let by = getY()
bot.enemyBearing = directionTo(bx, by, e.x, e.y)
bot.distance = distanceTo(bx, by, e.x, e.y)
bot.heading = e.direction
bot.velocity = e.speed # signed: positive = forward, negative = reverse
if bot.hasLastPos:
discard # velocity from e.speed is more accurate; position delta kept for future use
bot.lastEnemyX = e.x
bot.lastEnemyY = e.y
bot.hasLastPos = true
bot.hasContact = true
bot.velocity = e.speed
bot.lastEnemyX = e.x
bot.lastEnemyY = e.y
bot.hasLastPos = true
bot.hasContact = true
let arenaW = getArenaWidth().float
let arenaH = getArenaHeight().float
let enemyX = e.x
let enemyY = e.y
let scan = ScanData(
bearing: bot.enemyBearing,
distance: bot.distance,
velocity: bot.velocity,
heading: bot.heading,
myWallN: arenaH - by,
myWallS: by,
myWallE: arenaW - bx,
myWallW: bx,
enemyWallN: arenaH - enemyY,
enemyWallS: enemyY,
enemyWallE: arenaW - enemyX,
enemyWallW: enemyX,
myEnergy: getEnergy(),
enemyEnergy: e.energy,
canFire: getGunHeat() <= 0.0,
let arenaW = getArenaWidth().float
let arenaH = getArenaHeight().float
let enemyX = e.x
let enemyY = e.y
let frame = EnemyScanFrame(
bearing: bot.enemyBearing,
distance: bot.distance,
velocity: bot.velocity,
heading: bot.heading,
enemyWallN: arenaH - enemyY,
enemyWallS: enemyY,
enemyWallE: arenaW - enemyX,
enemyWallW: enemyX,
enemyEnergy: e.energy,
)
let vec = encode(scan)
let hamming = if bot.hasPrev: hammingDistance(bot.prevVec, vec) else: 0
let encoded = encodeFrame(frame)
# Shift buffer: 0..8 → 1..9, newest at index 0
for i in countdown(WINDOW_SIZE - 1, 1):
bot.frameBuffer[i] = bot.frameBuffer[i - 1]
bot.frameBuffer[0] = encoded
if bot.bufferCount < WINDOW_SIZE:
inc bot.bufferCount
if bot.bufferCount < WINDOW_SIZE:
return # still filling
let selfState = SelfState(
myWallN: arenaH - by,
myWallS: by,
myWallE: arenaW - bx,
myWallW: bx,
myEnergy: getEnergy(),
canFire: getGunHeat() <= 0.0,
)
let selfEncoded = encodeSelf(selfState)
let vec = encodeFullVector(bot.frameBuffer, selfEncoded)
let hamming = if bot.hasPrev: hammingDistance(bot.prevVec, vec) else: 0
let similarity = if bot.hasPrev: TOTAL_BITS - hamming else: 0
let overlap = if bot.hasPrev: popcount(bitwiseAnd(bot.prevVec, vec)) else: 0
let overlap = if bot.hasPrev: popcount(bitwiseAnd(bot.prevVec, vec)) else: 0
echo align($bot.tick, 4), " ", formatBinary(vec), " ", hamming, " ", similarity, " ", overlap
bot.prevVec = vec
bot.hasPrev = true
@@ -74,6 +91,7 @@ method onRoundStarted*(bot: BNNBot, e: RoundStartedEvent) =
bot.hasLastPos = false
bot.tick = 0
bot.hasPrev = false
bot.bufferCount = 0
setTargetSpeed(0.0)
setTurnRate(0.0)
BNNBot_garage/src/binary_encoding.nim
+63 -43
View File
@@ -1,27 +1,32 @@
import std/math
const
TOTAL_BITS* = 123
FRAME_BITS* = 83
SELF_BITS* = 40
WINDOW_SIZE* = 10
TOTAL_BITS* = FRAME_BITS * WINDOW_SIZE + SELF_BITS # 870
type
BinaryVector* = array[TOTAL_BITS, uint8]
ScanData* = object
bearing*: float # 0-360 degrees
distance*: float # 0-1414 pixels (will be converted to 0-100%)
velocity*: float # -8 to +8 integer steps
heading*: float # 0-360 degrees
myWallN*: float # our distance to north wall
myWallS*: float # our distance to south wall
myWallE*: float # our distance to east wall
myWallW*: float # our distance to west wall
enemyWallN*: float # enemy distance to north wall
enemyWallS*: float # enemy distance to south wall
enemyWallE*: float # enemy distance to east wall
enemyWallW*: float # enemy distance to west wall
myEnergy*: float # 0-150
enemyEnergy*: float # 0-150
canFire*: bool # gun heat == 0
EnemyScanFrame* = object
bearing*: float # → sin/cos, 8+8 bits
distance*: float # → %, 7 bits
velocity*: float # → 5 bits
heading*: float # → sin/cos, 8+8 bits
enemyWallN*: float # 7 bits
enemyWallS*: float # 7 bits
enemyWallE*: float # 7 bits
enemyWallW*: float # 7 bits
enemyEnergy*: float # 11 bits
SelfState* = object
myWallN*: float # 7 bits
myWallS*: float # 7 bits
myWallE*: float # 7 bits
myWallW*: float # 7 bits
myEnergy*: float # 11 bits
canFire*: bool # 1 bit
const MAX_DISTANCE = 1414.0 # diagonal of 1000x1000 arena
@@ -34,73 +39,88 @@ proc toBits(value: int, bits: int): seq[uint8] =
for i in 0..<bits:
result[bits - 1 - i] = uint8((gray shr i) and 1)
proc encode*(scan: ScanData): BinaryVector =
proc encodeFrame*(frame: EnemyScanFrame): array[FRAME_BITS, uint8] =
var offset = 0
# 1. bearing_sin: sin(bearing), -1..+1 → 0..199 → 8 bits
let bSin = int((sin(degToRad(scan.bearing)) + 1.0) / 2.0 * 199.0)
# bearing sin: 8 bits
let bSin = int((sin(degToRad(frame.bearing)) + 1.0) / 2.0 * 199.0)
let bSinBits = toBits(clamp(bSin, 0, 199), 8)
for i in 0..<8: result[offset + i] = bSinBits[i]
offset += 8
# 2. bearing_cos: cos(bearing), -1..+1 → 0..199 → 8 bits
let bCos = int((cos(degToRad(scan.bearing)) + 1.0) / 2.0 * 199.0)
# bearing cos: 8 bits
let bCos = int((cos(degToRad(frame.bearing)) + 1.0) / 2.0 * 199.0)
let bCosBits = toBits(clamp(bCos, 0, 199), 8)
for i in 0..<8: result[offset + i] = bCosBits[i]
offset += 8
# 3. distance %: 0-100% of max → 0..99 → 7 bits
let distPct = int(clamp(scan.distance / MAX_DISTANCE * 99.0, 0.0, 99.0))
# distance %: 7 bits
let distPct = int(clamp(frame.distance / MAX_DISTANCE * 99.0, 0.0, 99.0))
let distBits = toBits(distPct, 7)
for i in 0..<7: result[offset + i] = distBits[i]
offset += 7
# 4. velocity: -8..+8 → 0..16 → 5 bits
let vel = int(clamp(scan.velocity + 8.0, 0.0, 16.0))
# velocity: 5 bits
let vel = int(clamp(frame.velocity + 8.0, 0.0, 16.0))
let velBits = toBits(vel, 5)
for i in 0..<5: result[offset + i] = velBits[i]
offset += 5
# 5. heading_sin: sin(heading), -1..+1 → 0..199 → 8 bits
let hSin = int((sin(degToRad(scan.heading)) + 1.0) / 2.0 * 199.0)
# heading sin: 8 bits
let hSin = int((sin(degToRad(frame.heading)) + 1.0) / 2.0 * 199.0)
let hSinBits = toBits(clamp(hSin, 0, 199), 8)
for i in 0..<8: result[offset + i] = hSinBits[i]
offset += 8
# 6. heading_cos: cos(heading), -1..+1 → 0..199 → 8 bits
let hCos = int((cos(degToRad(scan.heading)) + 1.0) / 2.0 * 199.0)
# heading cos: 8 bits
let hCos = int((cos(degToRad(frame.heading)) + 1.0) / 2.0 * 199.0)
let hCosBits = toBits(clamp(hCos, 0, 199), 8)
for i in 0..<8: result[offset + i] = hCosBits[i]
offset += 8
# 7. My wall distances (7 bits each, 0-100% of arena dimension)
for wall in [scan.myWallN, scan.myWallS, scan.myWallE, scan.myWallW]:
# enemy wall distances: 4×7 bits
for wall in [frame.enemyWallN, frame.enemyWallS, frame.enemyWallE, frame.enemyWallW]:
let pct = int(clamp(wall / 1000.0 * 99.0, 0.0, 99.0))
let bits = toBits(pct, 7)
for i in 0..<7: result[offset + i] = bits[i]
offset += 7
# 8. Enemy wall distances (7 bits each)
for wall in [scan.enemyWallN, scan.enemyWallS, scan.enemyWallE, scan.enemyWallW]:
# enemy energy: 11 bits
let enE = int(clamp(frame.enemyEnergy * 10.0, 0.0, 1500.0))
let enEBits = toBits(enE, 11)
for i in 0..<11: result[offset + i] = enEBits[i]
# offset += 11 # last field, no need
proc encodeSelf*(self: SelfState): array[SELF_BITS, uint8] =
var offset = 0
# my wall distances: 4×7 bits
for wall in [self.myWallN, self.myWallS, self.myWallE, self.myWallW]:
let pct = int(clamp(wall / 1000.0 * 99.0, 0.0, 99.0))
let bits = toBits(pct, 7)
for i in 0..<7: result[offset + i] = bits[i]
offset += 7
# 9. My energy (11 bits, 0-150 → 0-1500 with 0.1 HP precision)
let myE = int(clamp(scan.myEnergy * 10.0, 0.0, 1500.0))
# my energy: 11 bits
let myE = int(clamp(self.myEnergy * 10.0, 0.0, 1500.0))
let myEBits = toBits(myE, 11)
for i in 0..<11: result[offset + i] = myEBits[i]
offset += 11
# 10. Enemy energy (11 bits, 0-150 → 0-1500 with 0.1 HP precision)
let enE = int(clamp(scan.enemyEnergy * 10.0, 0.0, 1500.0))
let enEBits = toBits(enE, 11)
for i in 0..<11: result[offset + i] = enEBits[i]
offset += 11
# canFire: 1 bit
result[offset] = if self.canFire: 1'u8 else: 0'u8
# 11. Can fire (1 bit)
result[offset] = if scan.canFire: 1'u8 else: 0'u8
proc encodeFullVector*(window: array[WINDOW_SIZE, array[FRAME_BITS, uint8]],
self: array[SELF_BITS, uint8]): BinaryVector =
var offset = 0
# LIFO: index 0 = newest frame
for i in 0..<WINDOW_SIZE:
for j in 0..<FRAME_BITS:
result[offset] = window[i][j]
inc offset
for j in 0..<SELF_BITS:
result[offset] = self[j]
inc offset
proc formatBinary*(vec: BinaryVector): string =
for b in vec: