1055 lines
33 KiB
HTML
1055 lines
33 KiB
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scene-actor-extraction
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How We Score Against X-Ray
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--! Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2025 Fonticons, Inc.--><path d="M439.6 236.1 244 40.5c-5.4-5.5-12.8-8.5-20.4-8.5s-15 3-20.4 8.4L162.5 81l51.5 51.5c27.1-9.1 52.7 16.8 43.4 43.7l49.7 49.7c34.2-11.8 61.2 31 35.5 56.7-26.5 26.5-70.2-2.9-56-37.3L240.3 199v121.9c25.3 12.5 22.3 41.8 9.1 55-6.4 6.4-15.2 10.1-24.3 10.1s-17.8-3.6-24.3-10.1c-17.6-17.6-11.1-46.9 11.2-56v-123c-20.8-8.5-24.6-30.7-18.6-45L142.6 101 8.5 235.1C3 240.6 0 247.9 0 255.5s3 15 8.5 20.4l195.6 195.7c5.4 5.4 12.7 8.4 20.4 8.4s15-3 20.4-8.4l194.7-194.7c5.4-5.4 8.4-12.8 8.4-20.4s-3-15-8.4-20.4"/></svg>
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dtourolle/scene-actor-extraction
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How We Score Against X-Ray
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Findings
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Full Experiment Log
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Service Conversion (proposal)
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scene-actor-extraction
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dtourolle/scene-actor-extraction
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How We Score Against X-Ray
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How We Score Against X-Ray
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What Amazon X-Ray records
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Why an offscreen name can be scored correct
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What this resolves and what it does not
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Precision, recall, and the misID weighting
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Reproduce
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Best Model
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Gallery Scope (Full vs. Limited)
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Pose Expansion
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LVFace Deep Dive
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Full Experiment Log
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Service Conversion (proposal)
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What this resolves and what it does not
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Precision, recall, and the misID weighting
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<h1 id="how-we-score-against-x-ray">How we score against X-Ray<a class="headerlink" href="#how-we-score-against-x-ray" title="Permanent link">¶</a></h1>
|
||
<p>Every number in this report, every F1 and misID count, comes from one
|
||
comparison. The comparison has a mismatch at its core that shapes nearly
|
||
every finding in this report: the ground truth is scene-level, the
|
||
pipeline's output is per-second, and the two do not mean the same thing.
|
||
This page documents that comparison once, so the findings pages can rely on
|
||
it without re-explaining it.</p>
|
||
<h2 id="what-amazon-x-ray-records">What Amazon X-Ray records<a class="headerlink" href="#what-amazon-x-ray-records" title="Permanent link">¶</a></h2>
|
||
<p>X-Ray ships three tables per film: <code>scenes.csv</code> (a list of <code>[start, end]</code>
|
||
timespans), <code>people_in_scenes.csv</code> (which actors are credited in each
|
||
scene), and <code>people.csv</code> (actor identities). There is no per-frame or
|
||
per-second annotation anywhere in X-Ray. A scene might run 45 seconds, and
|
||
X-Ray records one cast list for the entire span, not "on screen from
|
||
second 12 to second 30."</p>
|
||
<p>To compare this against per-second predictions, <code>second_score.py</code> expands
|
||
every scene into per-second ground truth by copying the whole scene's cast
|
||
list onto every second inside it:</p>
|
||
<div class="language-python highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="k">for</span> <span class="n">sn</span><span class="p">,</span> <span class="p">(</span><span class="n">t0</span><span class="p">,</span> <span class="n">t1</span><span class="p">)</span> <span class="ow">in</span> <span class="n">spans</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
|
||
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a> <span class="n">cast</span> <span class="o">=</span> <span class="n">scene_cast</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">sn</span><span class="p">,</span> <span class="p">[])</span>
|
||
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a> <span class="k">for</span> <span class="n">t</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">t0</span><span class="p">),</span> <span class="nb">int</span><span class="p">(</span><span class="n">t1</span><span class="p">)):</span>
|
||
</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a> <span class="n">timeline</span><span class="p">[</span><span class="n">t</span><span class="p">]</span> <span class="o">=</span> <span class="n">cast</span>
|
||
</span></code></pre></div>
|
||
<p>That is the entire mechanism. If X-Ray credits five actors to a 30-second
|
||
scene, all five count as ground truth present for all 30 seconds, including
|
||
seconds where only one of them is on screen. This is not a simplification
|
||
introduced by the pipeline; it is the only reading of X-Ray's data that is
|
||
possible, because X-Ray itself does not record anything finer-grained.</p>
|
||
<h2 id="why-an-offscreen-name-can-be-scored-correct">Why an offscreen name can be scored correct<a class="headerlink" href="#why-an-offscreen-name-can-be-scored-correct" title="Permanent link">¶</a></h2>
|
||
<p>A name listed under Offscreen with a correct (green) label is not the
|
||
pipeline guessing or padding its score. It is the pipeline correctly
|
||
answering the question X-Ray actually asks: is this actor part of this
|
||
scene. It answers that question using a presence window (<code>[start, end]</code>,
|
||
held open across cuts by <code>anneal_sec</code> and <code>extinction_sec</code>), which matches
|
||
X-Ray's scene-level semantics more closely than a raw per-frame detection
|
||
would.</p>
|
||
<p>A system that only reported "this actor is visible in this exact frame"
|
||
would score worse against X-Ray's scene-level ground truth, producing a
|
||
false negative every time the camera cuts away from a character who is
|
||
still present in the scene. Not because it is wrong about the world, but
|
||
because it would be answering a stricter, different question than the one
|
||
X-Ray's data supports. The presence-window design exists specifically to
|
||
answer X-Ray's actual question.</p>
|
||
<h2 id="what-this-resolves-and-what-it-does-not">What this resolves and what it does not<a class="headerlink" href="#what-this-resolves-and-what-it-does-not" title="Permanent link">¶</a></h2>
|
||
<p>This resolves the semantic mismatch between a scene and an instant. It does
|
||
not resolve two other limitations, both discussed in the
|
||
<a href="../lvface-deep-dive/">LVFace deep dive</a>.</p>
|
||
<p><strong>The face-vs-presence ceiling.</strong> X-Ray credits scene membership regardless
|
||
of whether a face is ever visible: background crew, characters shot from
|
||
behind, voice-only presence. No amount of bridging recovers a face that
|
||
never appears on screen. This is a hard ceiling on recall, not a defect.</p>
|
||
<p><strong>Extinction bridging can overshoot.</strong> The same presence-window mechanism
|
||
that correctly answers "still in this scene" during a normal cut can also
|
||
bridge across a scene boundary it has no way to detect. A hard cut into a
|
||
different scene with no faces, such as closing credits, carries the
|
||
previous scene's identities forward until the window expires. This is the
|
||
mechanism behind Downton Abbey's recall collapse, documented in the deep
|
||
dive.</p>
|
||
<h2 id="precision-recall-and-the-misid-weighting">Precision, recall, and the misID weighting<a class="headerlink" href="#precision-recall-and-the-misid-weighting" title="Permanent link">¶</a></h2>
|
||
<p>Per sampled second <code>t</code>:</p>
|
||
<p><strong>TPI</strong> (true positive instances): actors both X-Ray and the pipeline agree
|
||
are present.</p>
|
||
<p><strong>FPI</strong> (false positive instances): actors the pipeline reports that are
|
||
not in X-Ray's cast for this second. Split into two categories:</p>
|
||
<ul>
|
||
<li><strong>FPI_incast</strong>: the actor is in the film's cast, just not credited to
|
||
this particular scene. A timing or boundary slip.</li>
|
||
<li><strong>FPI_misid</strong>: the actor is not in the film's cast at all. A genuine
|
||
wrong-identity error, weighted 10x in the precision objective, because
|
||
naming someone who is not even in the film is a categorically worse
|
||
error than a few seconds of scene-boundary slop.</li>
|
||
</ul>
|
||
<div class="admonition note">
|
||
<p class="admonition-title">Every headline <code>P</code> and <code>F1</code> is misID-weighted</p>
|
||
<p>The precision reported throughout this report, and therefore the F1
|
||
derived from it, puts each <code>FPI_misid</code> into the denominator <strong>10 times</strong>
|
||
(<code>precision = TPI / (TPI + FPI_incast + 10·FPI_misid)</code>,
|
||
<a href="https://gitea.tourolle.paris/dtourolle/scene-actor-extraction/raw/commit/e5885977dfd04741a0d1bb7aaf0270d9c40a2fa8/scripts/optimizer/second_score.py"><code>second_score.py</code></a>).
|
||
This is deliberate: the whole point is to punish naming an out-of-film
|
||
actor far harder than a scene-boundary slip. But it means the <code>P</code> column
|
||
is not raw precision, and a misID-heavy film's <code>P</code> is depressed
|
||
super-linearly. <code>second_score.py</code> also emits an unweighted <code>precision_raw</code>
|
||
(always ≥ the weighted <code>P</code>); where the gap matters, The Many Saints of
|
||
Newark, weighted <code>P</code> 54.7% vs. raw 78.4%, the <a href="../lvface-deep-dive/">LVFace deep dive</a>
|
||
reports both. When comparing <code>P</code> across films, remember you are comparing a
|
||
quantity that penalizes misIDs, not just a hit rate.</p>
|
||
</div>
|
||
<p><strong>FN</strong> (false negatives): actors X-Ray lists that the pipeline never
|
||
reports, counted only for actors who have a gallery reference embedding.
|
||
Across the 9-film benchmark, coverage of X-Ray's credited cast ranges from
|
||
20% to 79% by film (see
|
||
<a href="../model-bakeoff/#gallery-coverage-per-film">the full experiment log</a>); an
|
||
actor with no reference photo can never be recognized regardless of model
|
||
quality, and counting them as a miss would penalize gallery coverage, not
|
||
recognition accuracy.</p>
|
||
<p>Two further numbers are reported alongside F1:</p>
|
||
<p><strong>agreement_rate</strong>: mean per-second Jaccard overlap
|
||
(<code>|Pred ∩ GT| / |Pred ∪ GT|</code>), partial credit. Naming 2 of 3 present actors
|
||
scores 2/3, not 0.</p>
|
||
<p><strong>exact_match_rate</strong>: the fraction of sampled seconds where the pipeline's
|
||
named set exactly equals X-Ray's, no partial credit. Far harsher, and
|
||
dominated by recall, since any single missed actor zeroes that second.</p>
|
||
<h2 id="reproduce">Reproduce<a class="headerlink" href="#reproduce" title="Permanent link">¶</a></h2>
|
||
<div class="language-bash highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a>python3<span class="w"> </span>scripts/optimizer/second_score.py<span class="w"> </span><span class="se">\</span>
|
||
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a><span class="w"> </span>--pred<span class="w"> </span>pred.json<span class="w"> </span>--xray<span class="w"> </span>experiments/xray/.../<xray_dir><span class="w"> </span><span class="se">\</span>
|
||
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="w"> </span>--gallery<span class="w"> </span>experiments/galleries/gallery_LVFace-B_Glint360K.h5
|
||
</span></code></pre></div>
|
||
<p>See also <a href="../model-bakeoff/">the full experiment log</a> for how <code>pred.json</code> is
|
||
produced, and the <a href="../lvface-deep-dive/">LVFace deep dive</a> for what these
|
||
mechanisms look like frame by frame.</p>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
</article>
|
||
</div>
|
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