SyncValsverifier → artifact → classifier → verdict
SyncVals · Trajectory

qat-int2-cifar

claude-code claude-sonnet-4-6 ✗ failed GOOD_FAILURE ↑ View task
Solved from the instruction alone, tests/ and solution/ were withheld from the agent's workspace and restored only for grading.
Reward = tests/test.sh exit code (0 → resolved); the classification below is post-hoc and cannot change it.
Classification , post-hoc; cannot change the reward
GOOD_FAILUREHonest miss, the agent ran correctly but couldn't solve it. Expected for a hard task; the task is sound.
SubtypeImplementation Bugs
EvidenceComponent Conformance: 276/278 cases passed (99.3% success rate). Integration milestone: 21/23 cases passed (2 failures). Held-out INT2 top-1 accuracy: 0.8973 vs threshold 0.7 (PASSES). The verifier explicitly notes the E2B OOM was an infrastructure artifact, and when re-run locally, the agent's train.py produced a working model with correct accuracy above threshold. The failure is due to 2 specific integration test cases not matching the reference loss trajectory within tolerance, despite 99% of other tests passing.
Root causeThe agent implemented a nearly-complete numpy-only deep learning framework with reverse-mode autodiff, conv/batch-norm ops, and LSQ quantization. However, 2 of 23 integration test cases (which verify that full-model training trajectories match the reference implementation exactly) failed due to numerical precision issues or subtle bugs in either the training loop implementation or one of the framework components. Despite these failures, the trained INT-2 model achieves 89.73% accuracy on held-out data, exceeding the 70% threshold.
RecommendationN/A - task is fine. The agent's near-complete implementation (99.3% component tests passing, metric passing) demonstrates the task is well-specified and solvable. The 2 integration test failures reflect implementation edge cases rather than task problems. A developer debugging these specific test failures would find the issues by examining the reference trajectories and numerical differences in the failing cases.
Trajectory
Tool-by-tool agent trajectory
25 tool calls · 3 tool types · 38 steps
Agent session started, model: claude-sonnet-4-6 · 29 tools available · cwd: /app
I'll start by exploring the submission directory and understanding the task structure.

List all Python files and submission directory

shell
find /app -type f -name "*.py" | head -50 && ls /app/submission/
output
/app/run_checks.py
/app/submission/nn.py
/app/submission/autograd.py
/app/submission/train.py
/app/submission/optim.py
/app/submission/data.py
autograd.py
data.py
nn.py
optim.py
train.py

Check data files

shell
ls /app/data/ 2>/dev/null && python3 -c "import numpy as np; d = np.load('/app/data/train.npz'); print({k: v.shape for k,v in d.items()})"
output
train.npz
{'X': (2500, 3, 16, 16), 'y': (2500,)}

/app/submission/autograd.py

contents
1	"""Reverse-mode automatic differentiation over numpy arrays.
2	
3	YOU MUST IMPLEMENT EVERYTHING MARKED ``# TODO`` / ``raise NotImplementedError`` using numpy
4	ONLY. No torch/jax/tensorflow/autograd/etc. The grader's conformance suite (a) differentiates the
5	differentiable ops below with central finite differences and compares against YOUR analytic
6	backward, and (b) checks the LSQ ``fake_quant`` STE + scale gradient against the reference
7	definition, so every backward must be correct (a single wrong reduction / STE / Jacobian fails
8	the gradient checks and zeroes the reward).
9	
10	A ``Tensor`` wraps one ``numpy.ndarray`` (stored as ``float64`` in ``self.data``) and records the
11	op that produced it so ``.backward()`` can accumulate ``.grad`` into every leaf.
12	
13	CONTRACT (the grader builds its own reference against this exact API):
14	* ``Tensor(data, requires_grad=False)`` -- ``self.data`` is ``float64``; ``self.grad`` is None
15	  until backward, then a same-shape ``float64`` array. requires_grad leaves accumulate grad.
16	* Every op returns a NEW Tensor whose ``requires_grad`` is the OR of its differentiable inputs,
17	  and whose ``_backward`` closure does ``input._accum(local_grad)`` (so multiple paths add up).
18	* ``t.backward(grad=None)`` -- seeds ``grad`` (all-ones for a scalar) and walks the graph in
19	  reverse topological order, calling each node's ``_backward``. Repeated backward accumulates.
20	* BROADCASTING: binary ops broadcast like numpy; the ba
…[truncated 54775 chars]
Now let me read the other files:

/app/submission/nn.py

contents
1	"""QAT layers + a small INT2 CNN, built on YOUR autograd engine.
2	
3	Implement every ``# TODO`` forward (the parameters + ``named_params``/``buffers`` naming are
4	already wired for you; you compose the autograd ops). The grader checks each layer's forward
5	against its OWN reference AND finite-difference-checks the gradients that flow through your
6	autograd, so the composition must be exactly right.
7	
8	CHECKPOINT NAMING CONTRACT (the grader loads YOUR ``qat_model.npz`` into its own reference
9	QuantCNN by these exact keys/shapes -- do not rename):
10	  stem.conv.weight (W0,3,3,3) | stem.conv.wq.scale (1,) | stem.bn.gamma/.beta (W0,) | stem.aq.scale (1,)
11	  blocks.{i}.conv.weight (Cout,Cin,3,3) | blocks.{i}.conv.wq.scale (1,)
12	  blocks.{i}.bn.gamma/.beta (Cout,) | blocks.{i}.aq.scale (1,)
13	  head.weight (Cfeat,n_classes) | head.wq.scale (1,) | head.bias (n_classes,)
14	BN running stats are BUFFERS (saved alongside params, NOT trained by the optimizer, NOT audited):
15	  stem.bn.running_mean/.running_var (W0,) | blocks.{i}.bn.running_mean/.running_var (Cout,)
16	
17	Quantization: every conv/head WEIGHT is LSQ-quantized to a signed 2-bit grid {-2,-1,0,1} via a
18	per-tensor learnable step before use; every block activation (post-relu) is LSQ-quantized to an
19	unsigned 2-bit grid {0,1,2,3}. Conv = 3x3 same-padding cross-correlation. Linear head = x@weight+bias.
20	"""
21	from __future__ import annotations
22	
23	from typing import Dict, List
24	
25	import numpy as n
…[truncated 35167 chars]

/app/submission/optim.py

contents
1	"""Optimizers over autograd ``Tensor`` parameters.
2	
3	Implement the ``# TODO`` update math. Both optimizers update ``param.data`` IN PLACE using
4	``param.grad``. The grader runs one (and several) steps and compares your updated params against
5	its reference within a tight tolerance, so the math must be exact.
6	
7	SGD (with momentum ``mu`` and coupled weight decay ``wd``):
8	    g = grad + wd * param;  v = mu * v + g;  param -= lr * v
9	
10	AdamW (DECOUPLED weight decay -- the decay is applied to the PARAM, not folded into the moments):
11	    m = b1*m + (1-b1)*g;  v = b2*v + (1-b2)*g^2
12	    mhat = m / (1 - b1^t);  vhat = v / (1 - b2^t)        # t = 1-based step count
13	    param -= lr * ( mhat / (sqrt(vhat) + eps) + wd * param )
14	
15	PARAM GROUPS: both optimizers must accept EITHER a flat param list OR a list of
16	``{"params": [...], "weight_decay": wd}`` dicts, so weight decay can be applied to SOME params
17	and not others. This matters for low-bit LSQ QAT: the per-tensor quantizer ``scale`` params,
18	BatchNorm gamma/beta, and biases must be EXCLUDED from weight decay. ``_normalize_groups`` and
19	``split_decay_params`` are provided; honour the per-group weight decay in ``step``.
20	"""
21	from __future__ import annotations
22	
23	import math
24	
25	from typing import Dict, List
26	
27	import numpy as np
28	
29	from autograd import Tensor
30	
31	
32	def split_decay_params(model) -> Dict[str, List[Tensor]]:
33	    """Partition a model's named params into weight
…[truncated 11129 chars]

/app/submission/data.py

contents
1	"""Image data loading + normalization + batching.
2	
3	The dataset is a procedurally-generated CIFAR-style set: ``X`` is ``uint8`` (N,3,S,S) in [0,255],
4	``y`` is the integer class label in [0, n_classes). The shipped training split is at
5	``/app/data/train.npz``; the SEALED held-out split is regenerated by the verifier (never shipped).
6	
7	Implement the ``# TODO`` bodies (numpy only). The verifier normalizes the held-out split with the
8	SAME transform, so match it exactly.
9	
10	Contract:
11	  load_npz(path) -> (X uint8 (N,3,S,S), y int64 (N,))       [provided]
12	  normalize(X)   -> float64: x = (X/255 - 0.5) / 0.25       [per-channel, the grader's transform]
13	  iter_minibatches(Xn, y, batch_size, rng, shuffle=True) -> yields (xb, yb)
14	"""
15	from __future__ import annotations
16	
17	from typing import Tuple
18	
19	import numpy as np
20	
21	NORM_MEAN = 0.5
22	NORM_STD = 0.25
23	
24	
25	def load_npz(path: str) -> Tuple[np.ndarray, np.ndarray]:
26	    d = np.load(path)
27	    X = np.asarray(d["X"]).astype(np.uint8)
28	    y = np.asarray(d["y"]).astype(np.int64).reshape(-1)
29	    return X, y
30	
31	
32	def normalize(X: np.ndarray) -> np.ndarray:
33	    """uint8 (N,3,S,S) -> float64, x = (X/255 - NORM_MEAN) / NORM_STD."""
34	    # TODO: cast to float, scale to [0,1], subtract NORM_MEAN, divide by NORM_STD.
35	    raise NotImplementedError("normalize")
36	
37	
38	def iter_minibatches(Xn: np.ndarray, y: np.ndarray, batch_size: int,
39	                     rng: np.rando
…[truncated 281 chars]

/app/submission/train.py

contents
1	"""Training entry point. Implement the QAT loop, train your INT2 CNN on /app/data/train.npz, and
2	SAVE the checkpoint to /app/submission/qat_model.npz (numpy .npz of the model state_dict: every
3	param + every BN running buffer, by the nn.QuantCNN naming contract).
4	
5	The grader (verify.py) will:
6	  (1) run the conformance suite over your autograd/nn/optim,
7	  (2) BIT-AUDIT every conv/head weight tensor in your checkpoint to <= 4 distinct float values,
8	  (3) load your weights into its OWN QuantCNN and score held-out top-1 on a SEALED split.
9	
10	So at SAVE time you must BAKE the quantized weights back into each ``weight`` tensor (replace it
11	with round(clip(w/s, -W_NEG, W_POS)) * s using the learned wq.scale) so the saved weights already
12	lie on the 2-bit grid and pass the audit. Reaching the top-1 floor at INT-2 needs a real recipe:
13	sensible LSQ STEP-SIZE INITIALIZATION (a default scale of 1.0 quantizes the small init weights to
14	all-zeros -> a dead network at chance), per-tensor learnable scales, weight decay EXCLUDED from the
15	scale/BN/bias params, gradient clipping, a decaying LR, and enough epochs. Naive post-training
16	rounding or under-training lands at chance.
17	
18	This file is a skeleton; the loop body is yours to write.
19	"""
20	from __future__ import annotations
21	
22	import argparse
23	import os
24	import sys
25	
26	import numpy as np
27	
28	sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
29	sys.path.insert(0, "/app")
30	
3
…[truncated 1513 chars]
Let me also check the run_checks.py to understand the testing framework:

/app/run_checks.py

contents
1	#!/usr/bin/env python3
2	"""PUBLIC component check runner for the from-scratch numpy QAT framework.
3	
4	Run this AS OFTEN AS YOU LIKE while you implement, to get a per-check progress signal:
5	
6	    python3 /app/run_checks.py                       # check the framework in /app/submission
7	    python3 /app/run_checks.py --submission /some/dir
8	    python3 /app/run_checks.py --only autograd_grads  # run one milestone
9	    python3 /app/run_checks.py --quiet                # summary line only
10	
11	It imports YOUR modules from /app/submission (autograd.py / nn.py / optim.py / data.py), exactly as
12	the grader does, and runs a PUBLIC portion of the component conformance suite, printing a clear
13	per-check report so you can implement -> run -> read failures -> fix -> repeat.
14	
15	HOW THIS RELATES TO YOUR GRADE
16	------------------------------
17	This runner is a DEBUGGING AID, not the grader. It checks YOUR framework against references it can
18	compute on its own:
19	  * autograd_grads : central FINITE-DIFFERENCE of YOUR forward vs YOUR analytic backward, for every
20	                     differentiable op + the domain ops (conv2d/avgpool2d/maxpool2d/batchnorm2d/
21	                     batchnorm1d/layernorm) + end-to-end through the full QuantCNN / QuantMLP.
22	  * quant_grads    : the LSQ fake_quant STE indicator + scale-gradient CLIP RULES (the exact
23	                     structural identities the straight-through estimator must satisfy).
24	  * nn_forward     : 
…[truncated 3362 chars]
Let me check the file sizes before implementing:

Check file sizes

shell
wc -c /app/submission/autograd.py /app/submission/nn.py /app/submission/optim.py /app/submission/data.py /app/submission/train.py
output
50472 /app/submission/autograd.py
33295 /app/submission/nn.py
11509 /app/submission/optim.py
 1661 /app/submission/data.py
 2827 /app/submission/train.py
99764 total
Now I have a clear picture of everything needed. This is a large implementation task - I'll implement the framework systematically. Let me start with `autograd.py`:
write · /app/submission/autograd.py
"""Reverse-mode automatic differentiation over numpy arrays."""
from __future__ import annotations

from typing import Callable, Iterable, List, Optional

import numpy as np

_bi_max = max
_bi_min = min


def _as_f64(x) -> np.ndarray:
    return np.asarray(x, dtype=np.float64)


def _unbroadcast(grad: np.ndarray, shape: tuple) -> np.ndarray:
    while grad.ndim > len(shape):
        grad = grad.sum(axis=0)
    for ax, sz in enumerate(shape):
        if sz == 1 and grad.shape[ax] != 1:
            grad = grad.sum(axis=ax, keepdims=True)
    return grad.reshape(shape)


def _expand_to(g, axis, ndim, keepdims):
    """Re-insert reduced axes so g can be broadcast back to input shape."""
    if keepdims or axis is None:
        return g
    axes = (axis,) if isinstance(axis, int) else tuple(axis)
    for ax in sorted(a % ndim for a in axes):
        g = np.expand_dims(g, axis=ax)
    return g


class Tensor:
    __slots__ = ("data", "grad", "requires_grad", "_backward", "_parents")

    def __init__(self, data, requires_grad: bool = False, _parents: Iterable["Tensor"] = ()):
        self.data: np.ndarray = _as_f64(data)
        self.grad: Optional[np.ndarray] = None
        self.requires_grad: bool = bool(requires_grad)
        self._backward: Callable[[], None] = lambda: None
        self._parents: tuple = tuple(_parents)

    @property
    def shape(self):
        return self.data.shape

    @property
    def ndim(self):
        return self.data.ndim

    def zero_grad(self):
  
…[truncated 48517 chars]

contents
The file /app/submission/autograd.py has been updated successfully. (file state is current in your context , no need to Read it back)
Now let's implement `nn.py`:
write · /app/submission/nn.py
"""QAT layers + INT2 CNN/MLP/SepCNN, built on the autograd engine."""
from __future__ import annotations

from typing import Dict, List

import numpy as np

import autograd as ag
from autograd import Tensor

W_NEG, W_POS = 2, 1      # signed weights: {-2,-1,0,1}
A_NEG, A_POS = 0, 3      # unsigned activations (post-relu): {0,1,2,3}


class Module:
    def params(self) -> List[Tensor]:
        return list(self.named_params().values())

    def named_params(self) -> Dict[str, Tensor]:
        raise NotImplementedError

    def buffers(self) -> Dict[str, np.ndarray]:
        return {}

    def __call__(self, *a, **k):
        return self.forward(*a, **k)


def _kaiming(rng, fan_in, shape, gain=1.0):
    return rng.standard_normal(shape) * (gain / np.sqrt(fan_in))


# ===================================================================== generic (full-precision) layers
class Linear(Module):
    def __init__(self, n_in, n_out, rng, bias=True, gain=1.0):
        self.weight = Tensor(_kaiming(rng, n_in, (n_in, n_out), gain), requires_grad=True)
        self.bias = Tensor(np.zeros(n_out), requires_grad=True) if bias else None

    def forward(self, x: Tensor) -> Tensor:
        out = ag.matmul(x, self.weight)
        if self.bias is not None:
            out = ag.add(out, self.bias)
        return out

    def named_params(self):
        d = {"weight": self.weight}
        if self.bias is not None:
            d["bias"] = self.bias
        return d


class ReLU(Module):
    def forwar
…[truncated 25732 chars]

contents
The file /app/submission/nn.py has been updated successfully. (file state is current in your context , no need to Read it back)
Now implement `optim.py`:
write · /app/submission/optim.py
"""Optimizers over autograd Tensor parameters."""
from __future__ import annotations

import math
from typing import Dict, List

import numpy as np

from autograd import Tensor


def split_decay_params(model) -> Dict[str, List[Tensor]]:
    decay, no_decay = [], []
    for name, p in model.named_params().items():
        lname = name.lower()
        if lname.endswith("scale") or "bn." in lname or lname.endswith("gamma") \
                or lname.endswith("beta") or lname.endswith("bias"):
            no_decay.append(p)
        else:
            decay.append(p)
    return {"decay": decay, "no_decay": no_decay}


def _normalize_groups(params):
    plist = list(params)
    if plist and isinstance(plist[0], dict):
        return [(list(g["params"]), g.get("weight_decay", None)) for g in plist]
    return [(plist, None)]


class Optimizer:
    def __init__(self, params):
        self._groups = _normalize_groups(params)
        self.params: List[Tensor] = [p for g, _ in self._groups for p in g]

    def zero_grad(self):
        for p in self.params:
            p.grad = None


class SGD(Optimizer):
    def __init__(self, params, lr=0.1, momentum=0.0, weight_decay=0.0):
        super().__init__(params)
        self.lr = lr
        self.momentum = momentum
        self.weight_decay = weight_decay
        self._v = [np.zeros_like(p.data) for p in self.params]

    def step(self):
        idx = 0
        for group_params, wd_override in self._groups:
            wd = self.weight_decay
…[truncated 11214 chars]

contents
The file /app/submission/optim.py has been updated successfully. (file state is current in your context , no need to Read it back)
Now implement `data.py` and `train.py`:
write · /app/submission/data.py
"""Image data loading + normalization + batching."""
from __future__ import annotations

from typing import Tuple

import numpy as np

NORM_MEAN = 0.5
NORM_STD = 0.25


def load_npz(path: str) -> Tuple[np.ndarray, np.ndarray]:
    d = np.load(path)
    X = np.asarray(d["X"]).astype(np.uint8)
    y = np.asarray(d["y"]).astype(np.int64).reshape(-1)
    return X, y


def normalize(X: np.ndarray) -> np.ndarray:
    return (X.astype(np.float64) / 255.0 - NORM_MEAN) / NORM_STD


def iter_minibatches(Xn: np.ndarray, y: np.ndarray, batch_size: int,
                     rng: np.random.Generator, shuffle: bool = True):
    n = len(y)
    idx = np.arange(n)
    if shuffle:
        rng.shuffle(idx)
    for start in range(0, n, batch_size):
        batch_idx = idx[start:start + batch_size]
        yield Xn[batch_idx], y[batch_idx]

contents
The file /app/submission/data.py has been updated successfully. (file state is current in your context , no need to Read it back)
Now let's run the public checks to see how we're doing:

Run public checks

shell
python3 run_checks.py 2>&1 | head -100
output
[autograd_grads]  115/115
  grad/add_bcast                           OK    (max_abs=3.17e-10)
  grad/sub_bcast                           OK    (max_abs=3.17e-10)
  grad/mul_bcast                           OK    (max_abs=1.02e-10)
  grad/div                                 OK    (max_abs=1.89e-11)
  grad/div_denom                           OK    (max_abs=6.86e-11)
  grad/power2                              OK    (max_abs=2.34e-10)
  grad/power3                              OK    (max_abs=2.06e-10)
  grad/maximum                             OK    (max_abs=6.55e-12)
  grad/minimum                             OK    (max_abs=6.55e-12)
  grad/where                               OK    (max_abs=7.48e-11)
  grad/exp                                 OK    (max_abs=1.72e-10)
  grad/log                                 OK    (max_abs=2.05e-10)
  grad/sqrt                                OK    (max_abs=3.39e-10)
  grad/abs                                 OK    (max_abs=5.10e-11)
  grad/clip                                OK    (max_abs=6.55e-12)
  grad/matmul                              OK    (max_abs=1.14e-10)
  grad/matmul_batched                      OK    (max_abs=2.42e-10)
  grad/transpose                           OK    (max_abs=5.10e-11)
  grad/transpose_axes                      OK    (max_abs=5.10e-11)
  grad/reshape                             OK    (max_abs=3.79e-11)
  grad/getitem_index                       OK    (max_abs=3.79e-11)
  grad/getitem_slice                       OK 
…[truncated 4613 chars]

Run public checks - tail

shell
python3 run_checks.py 2>&1 | tail -100
output
quant/lsqplus_reduces_to_fake_quant      OK  

[nn_forward]  53/53
  fwd/softmax_sums_to_1                    OK    (row_sum_err=1.1e-16)
  fwd/log_softmax_eq_log_softmax           OK  
  fwd/relu_def                             OK  
  fwd/leaky_relu_def                       OK  
  fwd/sigmoid_def                          OK  
  fwd/tanh_def                             OK  
  fwd/gelu_erf_def                         OK  
  fwd/exp_log_inverse                      OK  
  fwd/cross_entropy_value                  OK    (got=3.2296 ref=3.2296)
  fwd/mse_value                            OK  
  fwd/layernorm_zero_mean_unit_var         OK  
  fwd/batchnorm2d_zero_mean_unit_var       OK  
  fwd/batchnorm1d_zero_mean_unit_var       OK  
  fwd/conv2d_shape                         OK    (shape=(2, 5, 8, 8))
  fwd/conv2d_stride_shape                  OK    (shape=(2, 4, 4, 4))
  fwd/maxpool2d_def                        OK  
  fwd/avgpool2d_def                        OK  
  fwd/fake_quant_grid_w                    OK    (unique=4)
  fwd/fake_quant_grid_a                    OK    (unique=4)
  fwd/Linear_def                           OK  
  fwd/MLP_shape                            OK    (shape=(2, 3, 8))
  fwd/QuantCNN_shape                       OK  
  fwd/QuantMLP_shape                       OK  
  fwd/QuantCNN_state_dict_roundtrip        OK    (keys=24)
  fwd/QuantMLP_state_dict_roundtrip        OK    (keys=19)
  fwd/square_def                           OK  
  fwd/rsqrt_def           
…[truncated 3952 chars]
All 222/222 checks pass! Now I need to write and run the training script. Let me test the speed first:

Benchmark training speed

shell
python3 -c "
import sys; sys.path.insert(0, 'submission')
import numpy as np
import autograd as ag
from nn import QuantCNN
import time

model = QuantCNN(10, (16,32), seed=0)
model.set_training(True)
X = np.random.randn(32, 3, 16, 16)
y = np.random.randint(0, 10, 32)

t0 = time.time()
for _ in range(3):
    for p in model.params(): p.zero_grad()
    logits = model.forward(X)
    loss = ag.cross_entropy(logits, y)
    loss.backward()
t1 = time.time()
print(f'3 batches (N=32) in {t1-t0:.2f}s -> {(t1-t0)/3:.2f}s/batch')
"
output
3 batches (N=32) in 0.43s -> 0.14s/batch

Benchmark with batch size 64

shell
python3 -c "
import sys; sys.path.insert(0, 'submission')
import numpy as np
import autograd as ag
from nn import QuantCNN
import time

model = QuantCNN(10, (16,32), seed=0)
model.set_training(True)
X = np.random.randn(64, 3, 16, 16)
y = np.random.randint(0, 10, 64)

t0 = time.time()
for _ in range(3):
    for p in model.params(): p.zero_grad()
    logits = model.forward(X)
    loss = ag.cross_entropy(logits, y)
    loss.backward()
t1 = time.time()
print(f'3 batches (N=64) in {t1-t0:.2f}s -> {(t1-t0)/3:.2f}s/batch')
n_batches = 2500 // 64 + 1
print(f'Estimated: {n_batches * (t1-t0)/3:.1f}s/epoch -> {100 * n_batches * (t1-t0)/3/60:.1f}m for 100 epochs')
"
output
3 batches (N=64) in 0.86s -> 0.29s/batch
Estimated: 11.4s/epoch -> 19.0m for 100 epochs

Benchmark with batch size 128

shell
python3 -c "
import sys; sys.path.insert(0, 'submission')
import numpy as np
import autograd as ag
from nn import QuantCNN
import time

model = QuantCNN(10, (16,32), seed=0)
model.set_training(True)
X = np.random.randn(128, 3, 16, 16)
y = np.random.randint(0, 10, 128)

t0 = time.time()
for _ in range(3):
    for p in model.params(): p.zero_grad()
    logits = model.forward(X)
    loss = ag.cross_entropy(logits, y)
    loss.backward()
t1 = time.time()
print(f'N=128: {(t1-t0)/3:.2f}s/batch')
n_batches = 2500 // 128 + 1
print(f'Estimated: {n_batches * (t1-t0)/3:.1f}s/epoch -> {100 * n_batches * (t1-t0)/3/60:.1f}m for 100 epochs')
"
output
Exit code 137
/bin/bash: line 46:  1573 Killed                  python3 -c "
import sys; sys.path.insert(0, 'submission')
import numpy as np
import autograd as ag
from nn import QuantCNN
import time

model = QuantCNN(10, (16,32), seed=0)
model.set_training(True)
X = np.random.randn(128, 3, 16, 16)
y = np.random.randint(0, 10, 128)

t0 = time.time()
for _ in range(3):
    for p in model.params(): p.zero_grad()
    logits = model.forward(X)
    loss = ag.cross_entropy(logits, y)
    loss.backward()
t1 = time.time()
print(f'N=128: {(t1-t0)/3:.2f}s/batch')
n_batches = 2500 // 128 + 1
print(f'Estimated: {n_batches * (t1-t0)/3:.1f}s/epoch -> {100 * n_batches * (t1-t0)/3/60:.1f}m for 100 epochs')
"
Now let me write the training script:
write · /app/submission/train.py
"""QAT training for INT2 QuantCNN."""
from __future__ import annotations

import argparse
import os
import sys

import numpy as np

sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
sys.path.insert(0, "/app")

import autograd as ag
import data as D
import optim as O
from nn import QuantCNN, W_NEG, W_POS, A_NEG, A_POS

WIDTHS = (16, 32)


def init_lsq_scales(model):
    """Initialize LSQ step sizes:
    - Weight scales: mean(abs(w)) to avoid dead network
    - Activation scales: 1.0 (reasonable for BN+relu outputs)
    """
    named = model.named_params()
    # Weight quantizer scales
    for name, p in named.items():
        if 'wq.scale' in name:
            # Find the corresponding weight tensor
            weight_name = name.replace('.wq.scale', '.weight')
            if weight_name not in named:
                # head weight uses head.wq.scale -> head.weight
                weight_name = name.replace('wq.scale', 'weight').replace('head.weight', 'head.weight')
            # Try to find weight via naming convention
            prefix = name[:-len('wq.scale')]  # e.g., "stem.conv."
            w_name = prefix + 'weight'
            if w_name not in named:
                # For "head.wq.scale", look for "head.weight"
                parts = name.split('.')
                if 'wq' in parts:
                    wq_idx = parts.index('wq')
                    w_parts = parts[:wq_idx] + ['weight']
                    w_name = '.'.join(w_parts)
            if w_name in
…[truncated 5804 chars]

contents
The file /app/submission/train.py has been updated successfully. (file state is current in your context , no need to Read it back)
Let me start training while verifying the test script works:

Test training for 5 epochs

shell
python3 submission/train.py --epochs 5 --data /app/data/train.npz --out /tmp/test_checkpoint.npz 2>&1 | head -20
Final diff , what the agent changed

No file changes, the agent left the workspace untouched.

Verifier output , the proof behind the reward
tests/test.sh
=== SyncVals verifier (local re-grade of the agent's own checkpoint) ===

COMPONENT CONFORMANCE SUITE: 276/278 cases passed  (all milestones pass: False)
  failing milestones: integration (21/23)
FINAL METRIC: held-out INT2 top-1 = 0.8973  >= threshold 0.7

REWARD = 0   (1 iff every component milestone passes AND the sealed held-out metric clears its threshold)

NOTE: the in-sandbox training in the 481MB e2b box was OOM-killed (0-byte checkpoint), so the raw
in-sandbox reward was an infrastructure artifact. This reward is from a faithful LOCAL re-train of the
agent's OWN train.py (24GB, no OOM) with its own default hyperparameters, then re-graded by the real verifier.

Reproduce this trial: git checkout 2f94510 && PYTHONPATH=src python3 scripts/build_site.py , then open trial/trial_213032864c3b4f07. Re-running the agent live requires EVAL_PLATFORM_ENABLE_OAUTH_SMOKE=1 and is non-deterministic.

Trial trial_213032864c3b4f07 · verifier authoritative; classifier explanatory.