tests: Sanitize PEC tests

[jvesely]

Use param id instead of fake parameter.
Drop redundant return statements.
Use full precision expected result.
Skip on CUDA.

[jvesely]

cc @davidt0x

[github-actions]

This PR causes the following changes to the html docs (ubuntu-latest-3.7-x64):

diff -r docs-base/AutodiffComposition.html docs-head/AutodiffComposition.html
370c370
< <li><p>the <a class="reference internal" href="AutoAssociativeProjection.html#psyneulink.library.components.projections.pathway.autoassociativeprojection.AutoAssociativeProjection.matrix" title="psyneulink.library.components.projections.pathway.autoassociativeprojection.AutoAssociativeProjection.matrix"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">matrix</span></code></a> parameter of Projections</p></li>
---
> <li><p>the <a class="reference internal" href="RecurrentTransferMechanism.html#psyneulink.library.components.mechanisms.processing.transfer.recurrenttransfermechanism.RecurrentTransferMechanism.matrix" title="psyneulink.library.components.mechanisms.processing.transfer.recurrenttransfermechanism.RecurrentTransferMechanism.matrix"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">matrix</span></code></a> parameter of Projections</p></li>
602c602
< for each <a class="reference internal" href="Composition.html#psyneulink.core.compositions.composition.NodeRole.INPUT" title="psyneulink.core.compositions.composition.NodeRole.INPUT"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">INPUT</span></code></a> Node is used as its input (see <a class="reference internal" href="Composition.html#composition-execution-inputs"><span class="std std-ref">Input Formats</span></a> for
---
> for each <a class="reference internal" href="Pathway.html#psyneulink.core.compositions.pathway.PathwayRole.INPUT" title="psyneulink.core.compositions.pathway.PathwayRole.INPUT"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">INPUT</span></code></a> Node is used as its input (see <a class="reference internal" href="Composition.html#composition-execution-inputs"><span class="std std-ref">Input Formats</span></a> for
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< <li><p><strong>context</strong> (<a class="reference internal" href="Context.html#psyneulink.core.globals.context.Context.execution_id" title="psyneulink.core.globals.context.Context.execution_id"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">execution_id</span></code></a> : default <a class="reference internal" href="Composition.html#psyneulink.core.compositions.composition.Composition.default_execution_id" title="psyneulink.core.compositions.composition.Composition.default_execution_id"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">default_execution_id</span></code></a>) – <a class="reference internal" href="Composition.html#composition-execution-context"><span class="std std-ref">execution context</span></a> in which the <a class="reference internal" href="Composition.html"><span class="doc">Composition</span></a> will be executed.</p></li>
---
> <li><p><strong>context</strong> (<a class="reference internal" href="Context.html#psyneulink.core.globals.context.Context.execution_id" title="psyneulink.core.globals.context.Context.execution_id"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">execution_id</span></code></a> : default <a class="reference internal" href="Scheduler.html#psyneulink.core.scheduling.scheduler.Scheduler.default_execution_id" title="psyneulink.core.scheduling.scheduler.Scheduler.default_execution_id"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">default_execution_id</span></code></a>) – <a class="reference internal" href="Composition.html#composition-execution-context"><span class="std std-ref">execution context</span></a> in which the <a class="reference internal" href="Composition.html"><span class="doc">Composition</span></a> will be executed.</p></li>
diff -r docs-base/BasicsAndPrimer.html docs-head/BasicsAndPrimer.html
301,302c301,302
< Input Mechanism for the Composition is colored green (to designate it is an <a class="reference internal" href="Composition.html#psyneulink.core.compositions.composition.NodeRole.INPUT" title="psyneulink.core.compositions.composition.NodeRole.INPUT"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">INPUT</span></code></a> node), and its output
< Mechanism is colored Red (to designate it at a <a class="reference internal" href="Composition.html#psyneulink.core.compositions.composition.NodeRole.OUTPUT" title="psyneulink.core.compositions.composition.NodeRole.OUTPUT"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">OUTPUT</span></code></a> node).</span><a class="headerlink" href="#id3" title="Permalink to this image">¶</a></p>
---
> Input Mechanism for the Composition is colored green (to designate it is an <a class="reference internal" href="Pathway.html#psyneulink.core.compositions.pathway.PathwayRole.INPUT" title="psyneulink.core.compositions.pathway.PathwayRole.INPUT"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">INPUT</span></code></a> node), and its output
> Mechanism is colored Red (to designate it at a <a class="reference internal" href="Pathway.html#psyneulink.core.compositions.pathway.PathwayRole.OUTPUT" title="psyneulink.core.compositions.pathway.PathwayRole.OUTPUT"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">OUTPUT</span></code></a> node).</span><a class="headerlink" href="#id3" title="Permalink to this image">¶</a></p>
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< method.  Inputs are specified in a dictionary, with one entry for each of the Composition’s <a class="reference internal" href="Composition.html#psyneulink.core.compositions.composition.NodeRole.INPUT" title="psyneulink.core.compositions.composition.NodeRole.INPUT"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">INPUT</span></code></a>
---
> method.  Inputs are specified in a dictionary, with one entry for each of the Composition’s <a class="reference internal" href="Pathway.html#psyneulink.core.compositions.pathway.PathwayRole.INPUT" title="psyneulink.core.compositions.pathway.PathwayRole.INPUT"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">INPUT</span></code></a>
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< <p>When a Composition is run, its <a class="reference internal" href="Composition.html#psyneulink.core.compositions.composition.Composition.results" title="psyneulink.core.compositions.composition.Composition.results"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">results</span></code></a> attribute stores the values of its <a class="reference internal" href="Composition.html#psyneulink.core.compositions.composition.NodeRole.OUTPUT" title="psyneulink.core.compositions.composition.NodeRole.OUTPUT"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">OUTPUT</span></code></a> Mechanisms
< at the end of each <a class="reference internal" href="Time.html#psyneulink.core.scheduling.time.TimeScale.TRIAL" title="psyneulink.core.scheduling.time.TimeScale.TRIAL"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">trial</span></code></a>. In this case, the <a class="reference internal" href="DDM.html"><span class="doc">DDM</span></a> Mechanism is the only <a class="reference internal" href="Composition.html#psyneulink.core.compositions.composition.NodeRole.OUTPUT" title="psyneulink.core.compositions.composition.NodeRole.OUTPUT"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">OUTPUT</span></code></a> Mechanism, and it
---
> <p>When a Composition is run, its <a class="reference internal" href="Composition.html#psyneulink.core.compositions.composition.Composition.results" title="psyneulink.core.compositions.composition.Composition.results"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">results</span></code></a> attribute stores the values of its <a class="reference internal" href="Pathway.html#psyneulink.core.compositions.pathway.PathwayRole.OUTPUT" title="psyneulink.core.compositions.pathway.PathwayRole.OUTPUT"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">OUTPUT</span></code></a> Mechanisms
> at the end of each <a class="reference internal" href="Time.html#psyneulink.core.scheduling.time.TimeScale.TRIAL" title="psyneulink.core.scheduling.time.TimeScale.TRIAL"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">trial</span></code></a>. In this case, the <a class="reference internal" href="DDM.html"><span class="doc">DDM</span></a> Mechanism is the only <a class="reference internal" href="Pathway.html#psyneulink.core.compositions.pathway.PathwayRole.OUTPUT" title="psyneulink.core.compositions.pathway.PathwayRole.OUTPUT"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">OUTPUT</span></code></a> Mechanism, and it
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< Mechanism is the last (<a class="reference internal" href="Composition.html#psyneulink.core.compositions.composition.NodeRole.TERMINAL" title="psyneulink.core.compositions.composition.NodeRole.TERMINAL"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">TERMINAL</span></code></a>) Mechanism of the Composition, it is also its <a class="reference internal" href="Composition.html#psyneulink.core.compositions.composition.NodeRole.OUTPUT" title="psyneulink.core.compositions.composition.NodeRole.OUTPUT"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">OUTPUT</span></code></a> Mechanism.  Therefore, its
---
> Mechanism is the last (<a class="reference internal" href="Pathway.html#psyneulink.core.compositions.pathway.PathwayRole.TERMINAL" title="psyneulink.core.compositions.pathway.PathwayRole.TERMINAL"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">TERMINAL</span></code></a>) Mechanism of the Composition, it is also its <a class="reference internal" href="Pathway.html#psyneulink.core.compositions.pathway.PathwayRole.OUTPUT" title="psyneulink.core.compositions.pathway.PathwayRole.OUTPUT"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">OUTPUT</span></code></a> Mechanism.  Therefore, its
diff -r docs-base/BotvinickConflictMonitoringModel.html docs-head/BotvinickConflictMonitoringModel.html
271c271
< units to 1.0 for a given trial. Conflict is computed on the <a class="reference internal" href="ComparatorMechanism.html#psyneulink.library.components.mechanisms.processing.objective.comparatormechanism.ComparatorMechanism.output_port" title="psyneulink.library.components.mechanisms.processing.objective.comparatormechanism.ComparatorMechanism.output_port"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">output_port</span></code></a> of the <em>RESPONSE LAYER</em>. The figure plots
---
> units to 1.0 for a given trial. Conflict is computed on the <a class="reference internal" href="ObjectiveMechanism.html#psyneulink.core.components.mechanisms.processing.objectivemechanism.ObjectiveMechanism.output_port" title="psyneulink.core.components.mechanisms.processing.objectivemechanism.ObjectiveMechanism.output_port"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">output_port</span></code></a> of the <em>RESPONSE LAYER</em>. The figure plots
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< The <a class="reference internal" href="Component.html#psyneulink.core.components.component.Component.log" title="psyneulink.core.components.component.Component.log"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">log</span></code></a> function is used to record the output values of <em>RESPONSE LAYER</em>. These values are used to produce
---
> The <a class="reference internal" href="Parameters.html#psyneulink.core.globals.parameters.Parameter.log" title="psyneulink.core.globals.parameters.Parameter.log"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">log</span></code></a> function is used to record the output values of <em>RESPONSE LAYER</em>. These values are used to produce
diff -r docs-base/Cohen_HustonModel.html docs-head/Cohen_HustonModel.html
291,292c291,292
< <code class="xref any docutils literal notranslate"><span class="pre">termination_processing</span></code> parameter in the <a class="reference internal" href="Composition.html#psyneulink.core.compositions.composition.Composition.run" title="psyneulink.core.compositions.composition.Composition.run"><code class="xref any py py-meth docutils literal notranslate"><span class="pre">run</span></code></a> command.</p>
< <p>The <a class="reference internal" href="Component.html#psyneulink.core.components.component.Component.log" title="psyneulink.core.components.component.Component.log"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">log</span></code></a> function is used to record the output values of the <em>RESPONSE LAYER</em>. The cyles until a threshold is reached
---
> <code class="xref any docutils literal notranslate"><span class="pre">termination_processing</span></code> parameter in the <a class="reference internal" href="Scheduler.html#psyneulink.core.scheduling.scheduler.Scheduler.run" title="psyneulink.core.scheduling.scheduler.Scheduler.run"><code class="xref any py py-meth docutils literal notranslate"><span class="pre">run</span></code></a> command.</p>
> <p>The <a class="reference internal" href="Parameters.html#psyneulink.core.globals.parameters.Parameter.log" title="psyneulink.core.globals.parameters.Parameter.log"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">log</span></code></a> function is used to record the output values of the <em>RESPONSE LAYER</em>. The cyles until a threshold is reached
diff -r docs-base/Compilation.html docs-head/Compilation.html
211c211
< <p>The PsyNeuLink runtime compiler works in several steps when invoked via <a class="reference internal" href="Composition.html#psyneulink.core.compositions.composition.Composition.run" title="psyneulink.core.compositions.composition.Composition.run"><code class="xref any py py-meth docutils literal notranslate"><span class="pre">run</span></code></a> or <a class="reference internal" href="AutodiffComposition.html#psyneulink.library.compositions.autodiffcomposition.AutodiffComposition.execute" title="psyneulink.library.compositions.autodiffcomposition.AutodiffComposition.execute"><code class="xref any py py-meth docutils literal notranslate"><span class="pre">execute</span></code></a>:
---
> <p>The PsyNeuLink runtime compiler works in several steps when invoked via <a class="reference internal" href="Scheduler.html#psyneulink.core.scheduling.scheduler.Scheduler.run" title="psyneulink.core.scheduling.scheduler.Scheduler.run"><code class="xref any py py-meth docutils literal notranslate"><span class="pre">run</span></code></a> or <a class="reference internal" href="AutodiffComposition.html#psyneulink.library.compositions.autodiffcomposition.AutodiffComposition.execute" title="psyneulink.library.compositions.autodiffcomposition.AutodiffComposition.execute"><code class="xref any py py-meth docutils literal notranslate"><span class="pre">execute</span></code></a>:
diff -r docs-base/Component.html docs-head/Component.html
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< <dd class="field-odd"><p><a class="reference internal" href="AutodiffComposition.html#psyneulink.library.compositions.autodiffcomposition.AutodiffComposition.Parameters" title="psyneulink.library.compositions.autodiffcomposition.AutodiffComposition.Parameters">Parameters</a></p>
---
> <dd class="field-odd"><p><a class="reference internal" href="RegressionCFA.html#psyneulink.library.compositions.regressioncfa.RegressionCFA.Parameters" title="psyneulink.library.compositions.regressioncfa.RegressionCFA.Parameters">Parameters</a></p>
diff -r docs-base/Composition.html docs-head/Composition.html
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< <p>For example, by default, the <a class="reference internal" href="#psyneulink.core.compositions.composition.NodeRole.ORIGIN" title="psyneulink.core.compositions.composition.NodeRole.ORIGIN"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">ORIGIN</span></code></a> Nodes of a Composition are assigned as its <a class="reference internal" href="#psyneulink.core.comp
...

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[github-actions]

This PR causes the following changes to the html docs (ubuntu-latest-3.7-x64):

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[jvesely]

The first report of documentation differences is caused by ambiguous references, e.g. "matrix" can refer to several different "matrix" parameters. Without selecting a specific one, Sphinx picks an arbitrary one.