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[Bug]: artifacts displaying on Generation Strategy Graph of compute_analyses #5198
Description
What happened?
There seems to be artifacts displayed on the Generation Strategy Graph when running compute_analyses. No other graphs appear to have this problem
Please provide a minimal, reproducible example of the unexpected behavior.
This is pulled from the getting started code
from ax.api.client import Client
from ax.api.configs import RangeParameterConfig
client = Client()
client.configure_experiment(
name="booth_function",
parameters=[
RangeParameterConfig(
name="x1",
bounds=(-10.0, 10.0),
parameter_type="float",
),
RangeParameterConfig(
name="x2",
bounds=(-10.0, 10.0),
parameter_type="float",
),
],
)
client.configure_optimization(objective="-1 * booth")
for _ in range(20):
for trial_index, parameters in client.get_next_trials(max_trials=1).items():
client.complete_trial(
trial_index=trial_index,
raw_data={
"booth": (parameters["x1"] + 2 * parameters["x2"] - 7) ** 2
+ (2 * parameters["x1"] + parameters["x2"] - 5) ** 2
},
)
client.compute_analyses()
Please paste any relevant traceback/logs produced by the example provided.
Ax Version
1.2.4
Python Version
3.13.13
Operating System
Linux
(Optional) Describe any potential fixes you've considered to the issue outlined above.
No response
Pull Request
None
Code of Conduct
- I agree to follow Ax's Code of Conduct
Activity
prabhaks commentedon Jul 2, 2026
Hi! I can take a stab at this.
Hypothesis / proposed fix: the “Generation Strategy Graph” card is rendered via Graphviz → SVG, and
GraphvizAnalysisCard._body_html()appears to embed the raw result ofSource.pipe(format="svg"). In some environmentspipe()returns bytes, so the notebook ends up renderingb'...svg...'(and/or other garbled output) as “artifacts”.Proposed change: decode the SVG bytes before embedding in HTML, e.g.
svg = svg.decode("utf-8", errors="replace")whenisinstance(svg, (bytes, bytearray)).Test plan: add a small unit test that either (a) mocks
pipe()to return bytes and asserts the HTML does not contain"b'", or (b) generates a tiny Digraph and asserts the output HTML contains"<svg"and no"b'".If that sounds right, I’ll open a PR shortly.