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fix: warn when Eval() receives an empty dataset#109

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eric kontargyris (ekon15) merged 3 commits into from
Mar 21, 2026
Merged

fix: warn when Eval() receives an empty dataset #109

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6ca0b92
warn when Eval() receives an empty dataset
ekon15 Mar 20, 2026
128ff58
use eprint and bcolors.WARNING for empty dataset warning
ekon15 Mar 20, 2026
c6fcd4e
ruff format
ekon15 Mar 20, 2026
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12 changes: 8 additions & 4 deletions py/src/braintrust/framework.py
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -1276,7 +1276,8 @@ async def run_evaluator(
) -> EvalResultWithSummary[Input, Output]:
"""Wrapper on _run_evaluator_internal that times out execution after evaluator.timeout."""
results = await asyncio.wait_for(
_run_evaluator_internal(experiment, evaluator, position, filters, stream, state, enable_cache), evaluator.timeout
_run_evaluator_internal(experiment, evaluator, position, filters, stream, state, enable_cache),
evaluator.timeout,
)

if experiment:
Expand DownExpand Up@@ -1473,9 +1474,7 @@ def report_progress(event: TaskProgressEvent):
async def ensure_spans_flushed():
# Flush native Braintrust spans
if experiment:
await asyncio.get_event_loop().run_in_executor(
None, lambda: experiment.state.flush()
)
await asyncio.get_event_loop().run_in_executor(None, lambda: experiment.state.flush())
elif state:
await asyncio.get_event_loop().run_in_executor(None, lambda: state.flush())
else:
Expand DownExpand Up@@ -1671,6 +1670,11 @@ async def with_max_concurrency(coro):
for trial_index in range(evaluator.trial_count):
tasks.append(asyncio.create_task(with_max_concurrency(run_evaluator_task(datum, trial_index))))

if not tasks:
eprint(
f"{bcolors.WARNING}Warning: no data rows found for evaluator '{evaluator.eval_name}'. The experiment will be empty.{bcolors.ENDC}"
)

results = []
for task in std_tqdm(tasks, desc=f"{evaluator.eval_name} (tasks)", position=position, disable=position is None):
results.append(await task)
Expand Down
20 changes: 20 additions & 0 deletions py/src/braintrust/test_framework.py
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -531,6 +531,7 @@ def task_with_hooks(input, hooks):
assert len(root_span) == 1
assert root_span[0].get("tags") == None


@pytest.mark.asyncio
async def test_eval_enable_cache():
state = BraintrustState()
Expand DownExpand Up@@ -564,3 +565,22 @@ async def test_eval_enable_cache():
)
state.span_cache.start.assert_called()
state.span_cache.stop.assert_called()


@pytest.mark.asyncio
async def test_run_evaluator_empty_dataset_warns(capsys):
"""Warn when run_evaluator receives an empty dataset."""
evaluator = Evaluator(
project_name="test-project",
eval_name="test-evaluator",
data=[],
task=lambda input: input,
scores=[],
experiment_name=None,
metadata=None,
)
await run_evaluator(experiment=None, evaluator=evaluator, position=None, filters=[])

captured = capsys.readouterr()
assert "Warning" in captured.err
assert "empty" in captured.err.lower()
Loading
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(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
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btn.textContent = 'Copy';
btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';
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})();
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try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
fix: warn when Eval() receives an empty dataset by ekon15 · Pull Request #109 · braintrustdata/braintrust-sdk-python · GitHub
Skip to content
fix: warn when Eval() receives an empty dataset#109

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 Merged

eric kontargyris (ekon15)
merged 3 commits into

from

Mar 21, 2026
 Merged


fix: warn when Eval() receives an empty dataset
#109
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6ca0b92

warn when Eval() receives an empty dataset


ekon15 Mar 20, 2026
128ff58

use eprint and bcolors.WARNING for empty dataset warning


ekon15 Mar 20, 2026
c6fcd4e

ruff format


ekon15 Mar 20, 2026

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12 changes: 8 additions & 4 deletions
py/src/braintrust/framework.py

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1276,7 +1276,8 @@ async def run_evaluator(
) -> EvalResultWithSummary[Input, Output]:
 """Wrapper on _run_evaluator_internal that times out execution after evaluator.timeout."""
 results = await asyncio.wait_for(
 _run_evaluator_internal(experiment, evaluator, position, filters, stream, state, enable_cache), evaluator.timeout
 _run_evaluator_internal(experiment, evaluator, position, filters, stream, state, enable_cache),
 evaluator.timeout,
 )

 if experiment:
Expand DownExpand Up@@ -1473,9 +1474,7 @@ def report_progress(event: TaskProgressEvent):
 async def ensure_spans_flushed():
 # Flush native Braintrust spans
 if experiment:
 await asyncio.get_event_loop().run_in_executor(
 None, lambda: experiment.state.flush()
 )
 await asyncio.get_event_loop().run_in_executor(None, lambda: experiment.state.flush())
 elif state:
 await asyncio.get_event_loop().run_in_executor(None, lambda: state.flush())
 else:
Expand DownExpand Up@@ -1671,6 +1670,11 @@ async def with_max_concurrency(coro):
 for trial_index in range(evaluator.trial_count):
 tasks.append(asyncio.create_task(with_max_concurrency(run_evaluator_task(datum, trial_index))))

 if not tasks:
 eprint(
 f"{bcolors.WARNING}Warning: no data rows found for evaluator '{evaluator.eval_name}'. The experiment will be empty.{bcolors.ENDC}"
 )

 results = []
 for task in std_tqdm(tasks, desc=f"{evaluator.eval_name} (tasks)", position=position, disable=position is None):
 results.append(await task)
Expand Down

20 changes: 20 additions & 0 deletions
py/src/braintrust/test_framework.py

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -531,6 +531,7 @@ def task_with_hooks(input, hooks):
 assert len(root_span) == 1
 assert root_span[0].get("tags") == None


@pytest.mark.asyncio
async def test_eval_enable_cache():
 state = BraintrustState()
Expand DownExpand Up@@ -564,3 +565,22 @@ async def test_eval_enable_cache():
 )
 state.span_cache.start.assert_called()
 state.span_cache.stop.assert_called()


@pytest.mark.asyncio
async def test_run_evaluator_empty_dataset_warns(capsys):
 """Warn when run_evaluator receives an empty dataset."""
 evaluator = Evaluator(
 project_name="test-project",
 eval_name="test-evaluator",
 data=[],
 task=lambda input: input,
 scores=[],
 experiment_name=None,
 metadata=None,
 )
 await run_evaluator(experiment=None, evaluator=evaluator, position=None, filters=[])

 captured = capsys.readouterr()
 assert "Warning" in captured.err
 assert "empty" in captured.err.lower()
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
.markdown-body table th, .markdown-body table td { border-color: #30363d !important; }
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.markdown-body hr { border-color: #30363d; }
';
document.head.appendChild(style);
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}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
fix: warn when Eval() receives an empty dataset by ekon15 · Pull Request #109 · braintrustdata/braintrust-sdk-python · GitHub
Skip to content
fix: warn when Eval() receives an empty dataset#109

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 Merged

eric kontargyris (ekon15)
merged 3 commits into

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Mar 21, 2026
 Merged


fix: warn when Eval() receives an empty dataset
#109
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6ca0b92

warn when Eval() receives an empty dataset


ekon15 Mar 20, 2026
128ff58

use eprint and bcolors.WARNING for empty dataset warning


ekon15 Mar 20, 2026
c6fcd4e

ruff format


ekon15 Mar 20, 2026

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12 changes: 8 additions & 4 deletions
py/src/braintrust/framework.py

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1276,7 +1276,8 @@ async def run_evaluator(
) -> EvalResultWithSummary[Input, Output]:
 """Wrapper on _run_evaluator_internal that times out execution after evaluator.timeout."""
 results = await asyncio.wait_for(
 _run_evaluator_internal(experiment, evaluator, position, filters, stream, state, enable_cache), evaluator.timeout
 _run_evaluator_internal(experiment, evaluator, position, filters, stream, state, enable_cache),
 evaluator.timeout,
 )

 if experiment:
Expand DownExpand Up@@ -1473,9 +1474,7 @@ def report_progress(event: TaskProgressEvent):
 async def ensure_spans_flushed():
 # Flush native Braintrust spans
 if experiment:
 await asyncio.get_event_loop().run_in_executor(
 None, lambda: experiment.state.flush()
 )
 await asyncio.get_event_loop().run_in_executor(None, lambda: experiment.state.flush())
 elif state:
 await asyncio.get_event_loop().run_in_executor(None, lambda: state.flush())
 else:
Expand DownExpand Up@@ -1671,6 +1670,11 @@ async def with_max_concurrency(coro):
 for trial_index in range(evaluator.trial_count):
 tasks.append(asyncio.create_task(with_max_concurrency(run_evaluator_task(datum, trial_index))))

 if not tasks:
 eprint(
 f"{bcolors.WARNING}Warning: no data rows found for evaluator '{evaluator.eval_name}'. The experiment will be empty.{bcolors.ENDC}"
 )

 results = []
 for task in std_tqdm(tasks, desc=f"{evaluator.eval_name} (tasks)", position=position, disable=position is None):
 results.append(await task)
Expand Down

20 changes: 20 additions & 0 deletions
py/src/braintrust/test_framework.py

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -531,6 +531,7 @@ def task_with_hooks(input, hooks):
 assert len(root_span) == 1
 assert root_span[0].get("tags") == None


@pytest.mark.asyncio
async def test_eval_enable_cache():
 state = BraintrustState()
Expand DownExpand Up@@ -564,3 +565,22 @@ async def test_eval_enable_cache():
 )
 state.span_cache.start.assert_called()
 state.span_cache.stop.assert_called()


@pytest.mark.asyncio
async def test_run_evaluator_empty_dataset_warns(capsys):
 """Warn when run_evaluator receives an empty dataset."""
 evaluator = Evaluator(
 project_name="test-project",
 eval_name="test-evaluator",
 data=[],
 task=lambda input: input,
 scores=[],
 experiment_name=None,
 metadata=None,
 )
 await run_evaluator(experiment=None, evaluator=evaluator, position=None, filters=[])

 captured = capsys.readouterr()
 assert "Warning" in captured.err
 assert "empty" in captured.err.lower()
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
}
}
if (terms.length === 0) return;
var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
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var text = node.textContent;
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Array.from(node.childNodes).forEach(highlight);
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mutations.forEach(function(m) {
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observer.observe(document.body, { childList: true, subtree: true });
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try {
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var __re = new RegExp('^' + ".*" + '
fix: warn when Eval() receives an empty dataset by ekon15 · Pull Request #109 · braintrustdata/braintrust-sdk-python · GitHub
Skip to content
fix: warn when Eval() receives an empty dataset#109

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 Merged

eric kontargyris (ekon15)
merged 3 commits into

from

Mar 21, 2026
 Merged


fix: warn when Eval() receives an empty dataset
#109
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6ca0b92

warn when Eval() receives an empty dataset


ekon15 Mar 20, 2026
128ff58

use eprint and bcolors.WARNING for empty dataset warning


ekon15 Mar 20, 2026
c6fcd4e

ruff format


ekon15 Mar 20, 2026

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12 changes: 8 additions & 4 deletions
py/src/braintrust/framework.py

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1276,7 +1276,8 @@ async def run_evaluator(
) -> EvalResultWithSummary[Input, Output]:
 """Wrapper on _run_evaluator_internal that times out execution after evaluator.timeout."""
 results = await asyncio.wait_for(
 _run_evaluator_internal(experiment, evaluator, position, filters, stream, state, enable_cache), evaluator.timeout
 _run_evaluator_internal(experiment, evaluator, position, filters, stream, state, enable_cache),
 evaluator.timeout,
 )

 if experiment:
Expand DownExpand Up@@ -1473,9 +1474,7 @@ def report_progress(event: TaskProgressEvent):
 async def ensure_spans_flushed():
 # Flush native Braintrust spans
 if experiment:
 await asyncio.get_event_loop().run_in_executor(
 None, lambda: experiment.state.flush()
 )
 await asyncio.get_event_loop().run_in_executor(None, lambda: experiment.state.flush())
 elif state:
 await asyncio.get_event_loop().run_in_executor(None, lambda: state.flush())
 else:
Expand DownExpand Up@@ -1671,6 +1670,11 @@ async def with_max_concurrency(coro):
 for trial_index in range(evaluator.trial_count):
 tasks.append(asyncio.create_task(with_max_concurrency(run_evaluator_task(datum, trial_index))))

 if not tasks:
 eprint(
 f"{bcolors.WARNING}Warning: no data rows found for evaluator '{evaluator.eval_name}'. The experiment will be empty.{bcolors.ENDC}"
 )

 results = []
 for task in std_tqdm(tasks, desc=f"{evaluator.eval_name} (tasks)", position=position, disable=position is None):
 results.append(await task)
Expand Down

20 changes: 20 additions & 0 deletions
py/src/braintrust/test_framework.py

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -531,6 +531,7 @@ def task_with_hooks(input, hooks):
 assert len(root_span) == 1
 assert root_span[0].get("tags") == None


@pytest.mark.asyncio
async def test_eval_enable_cache():
 state = BraintrustState()
Expand DownExpand Up@@ -564,3 +565,22 @@ async def test_eval_enable_cache():
 )
 state.span_cache.start.assert_called()
 state.span_cache.stop.assert_called()


@pytest.mark.asyncio
async def test_run_evaluator_empty_dataset_warns(capsys):
 """Warn when run_evaluator receives an empty dataset."""
 evaluator = Evaluator(
 project_name="test-project",
 eval_name="test-evaluator",
 data=[],
 task=lambda input: input,
 scores=[],
 experiment_name=None,
 metadata=None,
 )
 await run_evaluator(experiment=None, evaluator=evaluator, position=None, filters=[])

 captured = capsys.readouterr()
 assert "Warning" in captured.err
 assert "empty" in captured.err.lower()
Loading

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'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
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try {
var u = new URL(url, window.location.origin);
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trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
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fix: warn when Eval() receives an empty dataset by ekon15 · Pull Request #109 · braintrustdata/braintrust-sdk-python · GitHub
Skip to content
fix: warn when Eval() receives an empty dataset#109

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 Merged

eric kontargyris (ekon15)
merged 3 commits into

from

Mar 21, 2026
 Merged


fix: warn when Eval() receives an empty dataset
#109
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6ca0b92

warn when Eval() receives an empty dataset


ekon15 Mar 20, 2026
128ff58

use eprint and bcolors.WARNING for empty dataset warning


ekon15 Mar 20, 2026
c6fcd4e

ruff format


ekon15 Mar 20, 2026

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12 changes: 8 additions & 4 deletions
py/src/braintrust/framework.py

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1276,7 +1276,8 @@ async def run_evaluator(
) -> EvalResultWithSummary[Input, Output]:
 """Wrapper on _run_evaluator_internal that times out execution after evaluator.timeout."""
 results = await asyncio.wait_for(
 _run_evaluator_internal(experiment, evaluator, position, filters, stream, state, enable_cache), evaluator.timeout
 _run_evaluator_internal(experiment, evaluator, position, filters, stream, state, enable_cache),
 evaluator.timeout,
 )

 if experiment:
Expand DownExpand Up@@ -1473,9 +1474,7 @@ def report_progress(event: TaskProgressEvent):
 async def ensure_spans_flushed():
 # Flush native Braintrust spans
 if experiment:
 await asyncio.get_event_loop().run_in_executor(
 None, lambda: experiment.state.flush()
 )
 await asyncio.get_event_loop().run_in_executor(None, lambda: experiment.state.flush())
 elif state:
 await asyncio.get_event_loop().run_in_executor(None, lambda: state.flush())
 else:
Expand DownExpand Up@@ -1671,6 +1670,11 @@ async def with_max_concurrency(coro):
 for trial_index in range(evaluator.trial_count):
 tasks.append(asyncio.create_task(with_max_concurrency(run_evaluator_task(datum, trial_index))))

 if not tasks:
 eprint(
 f"{bcolors.WARNING}Warning: no data rows found for evaluator '{evaluator.eval_name}'. The experiment will be empty.{bcolors.ENDC}"
 )

 results = []
 for task in std_tqdm(tasks, desc=f"{evaluator.eval_name} (tasks)", position=position, disable=position is None):
 results.append(await task)
Expand Down

20 changes: 20 additions & 0 deletions
py/src/braintrust/test_framework.py

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -531,6 +531,7 @@ def task_with_hooks(input, hooks):
 assert len(root_span) == 1
 assert root_span[0].get("tags") == None


@pytest.mark.asyncio
async def test_eval_enable_cache():
 state = BraintrustState()
Expand DownExpand Up@@ -564,3 +565,22 @@ async def test_eval_enable_cache():
 )
 state.span_cache.start.assert_called()
 state.span_cache.stop.assert_called()


@pytest.mark.asyncio
async def test_run_evaluator_empty_dataset_warns(capsys):
 """Warn when run_evaluator receives an empty dataset."""
 evaluator = Evaluator(
 project_name="test-project",
 eval_name="test-evaluator",
 data=[],
 task=lambda input: input,
 scores=[],
 experiment_name=None,
 metadata=None,
 )
 await run_evaluator(experiment=None, evaluator=evaluator, position=None, filters=[])

 captured = capsys.readouterr()
 assert "Warning" in captured.err
 assert "empty" in captured.err.lower()
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
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observer.observe(document.body, { childList: true, subtree: true });
})();
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} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
fix: warn when Eval() receives an empty dataset by ekon15 · Pull Request #109 · braintrustdata/braintrust-sdk-python · GitHub
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fix: warn when Eval() receives an empty dataset#109

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 Merged

eric kontargyris (ekon15)
merged 3 commits into

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Mar 21, 2026
 Merged


fix: warn when Eval() receives an empty dataset
#109
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6ca0b92

warn when Eval() receives an empty dataset


ekon15 Mar 20, 2026
128ff58

use eprint and bcolors.WARNING for empty dataset warning


ekon15 Mar 20, 2026
c6fcd4e

ruff format


ekon15 Mar 20, 2026

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12 changes: 8 additions & 4 deletions
py/src/braintrust/framework.py

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1276,7 +1276,8 @@ async def run_evaluator(
) -> EvalResultWithSummary[Input, Output]:
 """Wrapper on _run_evaluator_internal that times out execution after evaluator.timeout."""
 results = await asyncio.wait_for(
 _run_evaluator_internal(experiment, evaluator, position, filters, stream, state, enable_cache), evaluator.timeout
 _run_evaluator_internal(experiment, evaluator, position, filters, stream, state, enable_cache),
 evaluator.timeout,
 )

 if experiment:
Expand DownExpand Up@@ -1473,9 +1474,7 @@ def report_progress(event: TaskProgressEvent):
 async def ensure_spans_flushed():
 # Flush native Braintrust spans
 if experiment:
 await asyncio.get_event_loop().run_in_executor(
 None, lambda: experiment.state.flush()
 )
 await asyncio.get_event_loop().run_in_executor(None, lambda: experiment.state.flush())
 elif state:
 await asyncio.get_event_loop().run_in_executor(None, lambda: state.flush())
 else:
Expand DownExpand Up@@ -1671,6 +1670,11 @@ async def with_max_concurrency(coro):
 for trial_index in range(evaluator.trial_count):
 tasks.append(asyncio.create_task(with_max_concurrency(run_evaluator_task(datum, trial_index))))

 if not tasks:
 eprint(
 f"{bcolors.WARNING}Warning: no data rows found for evaluator '{evaluator.eval_name}'. The experiment will be empty.{bcolors.ENDC}"
 )

 results = []
 for task in std_tqdm(tasks, desc=f"{evaluator.eval_name} (tasks)", position=position, disable=position is None):
 results.append(await task)
Expand Down

20 changes: 20 additions & 0 deletions
py/src/braintrust/test_framework.py

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -531,6 +531,7 @@ def task_with_hooks(input, hooks):
 assert len(root_span) == 1
 assert root_span[0].get("tags") == None


@pytest.mark.asyncio
async def test_eval_enable_cache():
 state = BraintrustState()
Expand DownExpand Up@@ -564,3 +565,22 @@ async def test_eval_enable_cache():
 )
 state.span_cache.start.assert_called()
 state.span_cache.stop.assert_called()


@pytest.mark.asyncio
async def test_run_evaluator_empty_dataset_warns(capsys):
 """Warn when run_evaluator receives an empty dataset."""
 evaluator = Evaluator(
 project_name="test-project",
 eval_name="test-evaluator",
 data=[],
 task=lambda input: input,
 scores=[],
 experiment_name=None,
 metadata=None,
 )
 await run_evaluator(experiment=None, evaluator=evaluator, position=None, filters=[])

 captured = capsys.readouterr()
 assert "Warning" in captured.err
 assert "empty" in captured.err.lower()
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
fix: warn when Eval() receives an empty dataset by ekon15 · Pull Request #109 · braintrustdata/braintrust-sdk-python · GitHub
Skip to content
fix: warn when Eval() receives an empty dataset#109

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to your account

 Merged

eric kontargyris (ekon15)
merged 3 commits into

from

Mar 21, 2026
 Merged


fix: warn when Eval() receives an empty dataset
#109
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6ca0b92

warn when Eval() receives an empty dataset


ekon15 Mar 20, 2026
128ff58

use eprint and bcolors.WARNING for empty dataset warning


ekon15 Mar 20, 2026
c6fcd4e

ruff format


ekon15 Mar 20, 2026

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12 changes: 8 additions & 4 deletions
py/src/braintrust/framework.py

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1276,7 +1276,8 @@ async def run_evaluator(
) -> EvalResultWithSummary[Input, Output]:
 """Wrapper on _run_evaluator_internal that times out execution after evaluator.timeout."""
 results = await asyncio.wait_for(
 _run_evaluator_internal(experiment, evaluator, position, filters, stream, state, enable_cache), evaluator.timeout
 _run_evaluator_internal(experiment, evaluator, position, filters, stream, state, enable_cache),
 evaluator.timeout,
 )

 if experiment:
Expand DownExpand Up@@ -1473,9 +1474,7 @@ def report_progress(event: TaskProgressEvent):
 async def ensure_spans_flushed():
 # Flush native Braintrust spans
 if experiment:
 await asyncio.get_event_loop().run_in_executor(
 None, lambda: experiment.state.flush()
 )
 await asyncio.get_event_loop().run_in_executor(None, lambda: experiment.state.flush())
 elif state:
 await asyncio.get_event_loop().run_in_executor(None, lambda: state.flush())
 else:
Expand DownExpand Up@@ -1671,6 +1670,11 @@ async def with_max_concurrency(coro):
 for trial_index in range(evaluator.trial_count):
 tasks.append(asyncio.create_task(with_max_concurrency(run_evaluator_task(datum, trial_index))))

 if not tasks:
 eprint(
 f"{bcolors.WARNING}Warning: no data rows found for evaluator '{evaluator.eval_name}'. The experiment will be empty.{bcolors.ENDC}"
 )

 results = []
 for task in std_tqdm(tasks, desc=f"{evaluator.eval_name} (tasks)", position=position, disable=position is None):
 results.append(await task)
Expand Down

20 changes: 20 additions & 0 deletions
py/src/braintrust/test_framework.py

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -531,6 +531,7 @@ def task_with_hooks(input, hooks):
 assert len(root_span) == 1
 assert root_span[0].get("tags") == None


@pytest.mark.asyncio
async def test_eval_enable_cache():
 state = BraintrustState()
Expand DownExpand Up@@ -564,3 +565,22 @@ async def test_eval_enable_cache():
 )
 state.span_cache.start.assert_called()
 state.span_cache.stop.assert_called()


@pytest.mark.asyncio
async def test_run_evaluator_empty_dataset_warns(capsys):
 """Warn when run_evaluator receives an empty dataset."""
 evaluator = Evaluator(
 project_name="test-project",
 eval_name="test-evaluator",
 data=[],
 task=lambda input: input,
 scores=[],
 experiment_name=None,
 metadata=None,
 )
 await run_evaluator(experiment=None, evaluator=evaluator, position=None, filters=[])

 captured = capsys.readouterr()
 assert "Warning" in captured.err
 assert "empty" in captured.err.lower()
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();
fix: warn when Eval() receives an empty dataset by ekon15 · Pull Request #109 · braintrustdata/braintrust-sdk-python · GitHub
Skip to content
fix: warn when Eval() receives an empty dataset#109

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

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privacy statement. We’ll occasionally send you account related emails.

Already on GitHub?
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 Merged

eric kontargyris (ekon15)
merged 3 commits into

from

Mar 21, 2026
 Merged


fix: warn when Eval() receives an empty dataset
#109
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6ca0b92

warn when Eval() receives an empty dataset


ekon15 Mar 20, 2026
128ff58

use eprint and bcolors.WARNING for empty dataset warning


ekon15 Mar 20, 2026
c6fcd4e

ruff format


ekon15 Mar 20, 2026

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12 changes: 8 additions & 4 deletions
py/src/braintrust/framework.py

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1276,7 +1276,8 @@ async def run_evaluator(
) -> EvalResultWithSummary[Input, Output]:
 """Wrapper on _run_evaluator_internal that times out execution after evaluator.timeout."""
 results = await asyncio.wait_for(
 _run_evaluator_internal(experiment, evaluator, position, filters, stream, state, enable_cache), evaluator.timeout
 _run_evaluator_internal(experiment, evaluator, position, filters, stream, state, enable_cache),
 evaluator.timeout,
 )

 if experiment:
Expand DownExpand Up@@ -1473,9 +1474,7 @@ def report_progress(event: TaskProgressEvent):
 async def ensure_spans_flushed():
 # Flush native Braintrust spans
 if experiment:
 await asyncio.get_event_loop().run_in_executor(
 None, lambda: experiment.state.flush()
 )
 await asyncio.get_event_loop().run_in_executor(None, lambda: experiment.state.flush())
 elif state:
 await asyncio.get_event_loop().run_in_executor(None, lambda: state.flush())
 else:
Expand DownExpand Up@@ -1671,6 +1670,11 @@ async def with_max_concurrency(coro):
 for trial_index in range(evaluator.trial_count):
 tasks.append(asyncio.create_task(with_max_concurrency(run_evaluator_task(datum, trial_index))))

 if not tasks:
 eprint(
 f"{bcolors.WARNING}Warning: no data rows found for evaluator '{evaluator.eval_name}'. The experiment will be empty.{bcolors.ENDC}"
 )

 results = []
 for task in std_tqdm(tasks, desc=f"{evaluator.eval_name} (tasks)", position=position, disable=position is None):
 results.append(await task)
Expand Down

20 changes: 20 additions & 0 deletions
py/src/braintrust/test_framework.py

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -531,6 +531,7 @@ def task_with_hooks(input, hooks):
 assert len(root_span) == 1
 assert root_span[0].get("tags") == None


@pytest.mark.asyncio
async def test_eval_enable_cache():
 state = BraintrustState()
Expand DownExpand Up@@ -564,3 +565,22 @@ async def test_eval_enable_cache():
 )
 state.span_cache.start.assert_called()
 state.span_cache.stop.assert_called()


@pytest.mark.asyncio
async def test_run_evaluator_empty_dataset_warns(capsys):
 """Warn when run_evaluator receives an empty dataset."""
 evaluator = Evaluator(
 project_name="test-project",
 eval_name="test-evaluator",
 data=[],
 task=lambda input: input,
 scores=[],
 experiment_name=None,
 metadata=None,
 )
 await run_evaluator(experiment=None, evaluator=evaluator, position=None, filters=[])

 captured = capsys.readouterr()
 assert "Warning" in captured.err
 assert "empty" in captured.err.lower()
Loading