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<p class="caption"><span class="caption-text">Introduction</span></p>
<ul class="current">
<li class="toctree-l1"><a class="reference internal" href="install.html">Installation</a></li>
<li class="toctree-l1 current"><a class="current reference internal" href="#">Selected Configuration Interaction</a><ul>
<li class="toctree-l2"><a class="reference internal" href="#simple-algorithm">Simple Algorithm</a></li>
<li class="toctree-l2"><a class="reference internal" href="#stochastic-approximations-for-the-selection-and-the-computation-of-ept">Stochastic approximations for the selection and the computation of <span class="math notranslate nohighlight">\(E_\text{PT2}\)</span></a></li>
<li class="toctree-l2"><a class="reference internal" href="#deterministic-approximations-for-the-selection">Deterministic approximations for the selection</a></li>
<li class="toctree-l2"><a class="reference internal" href="#modifying-the-selection-space">Modifying the selection space</a></li>
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<p class="caption"><span class="caption-text">User's guide</span></p>
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<li class="toctree-l1"><a class="reference internal" href="../users_guide/printing.html">Printing the near-<abbr title="Full Configuration Interaction">FCI</abbr> wave function</a></li>
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<p class="caption"><span class="caption-text">Appendix</span></p>
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<li class="toctree-l1"><a class="reference internal" href="../appendix/benchmarks.html">Benchmarks</a></li>
<li class="toctree-l1"><a class="reference internal" href="../appendix/research.html">Some research made with the <em>Quantum Package</em></a></li>
<li class="toctree-l1"><a class="reference internal" href="../appendix/license.html">License</a></li>
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<div class="section" id="selected-configuration-interaction">
<h1>Selected Configuration Interaction<a class="headerlink" href="#selected-configuration-interaction" title="Permalink to this headline"></a></h1>
<p>These methods rely on the same principle as the usual <abbr title="Configuration Interaction">CI</abbr> approaches, except
that determinants aren’t chosen <em>a priori</em> based on an occupation or
excitation criterion, but selected <em>on the fly</em> among the entire set of
determinants based on their estimated contribution to the <abbr title="Full Configuration Interaction">FCI</abbr> wave function.
It has been noticed long ago that, even inside a predefined subspace of
determinants, only a small number significantly contributes to the wave
function. <a class="reference internal" href="#bytautas-2009" id="id1">[A1]</a><a class="reference internal" href="#anderson-2018" id="id2">[A2]</a> Therefore, an <em>on the fly</em>
selection of determinants is a rather natural idea that has been proposed
in the late 60’s by Bender and Davidson <a class="reference internal" href="#bender-1969" id="id3">[A3]</a> as well as Whitten
and Hackmeyer. <a class="reference internal" href="#whitten-1969" id="id4">[A4]</a></p>
<p>The approach we are using in the <em>Quantum Package</em> is based on <abbr title="Configuration Interaction using a Perturbative Selection">CIPSI</abbr> developed by Huron,
Rancurel and Malrieu, <a class="reference internal" href="#huron-1973" id="id5">[A5]</a> that iteratively selects <em>external</em>
determinants (determinants which are not present in the variational space)
using a perturbative criterion.</p>
<p>There is however a computational downside. In <em>a priori</em> selected
methods, the rule by which determinants are selected is known <em>a
priori</em>, and therefore, one can map a particular determinant to some row or
column index. <a class="reference internal" href="#knowles-1984" id="id6">[A6]</a> As a consequence, it can be systematically
determined to which matrix element of <span class="math notranslate nohighlight">\(\hat H\)</span> a two-electron integral
contributes. This allows for the implementation of so-called
<em>integral-driven</em> methods, that work essentially by iterating over
integrals and are very fast.</p>
<p>On the contrary, in selected methods an explicit list of determinants has to be
kept, and there is no immediate way to know whether a determinant has been
selected, or what its index is in the list. Consequently, a
<em>determinant-driven</em> approach will be used, in which the loops run over
determinants rather than integrals. This can be a lot more computationally
expensive since the number of determinants is typically much larger than the
number of integrals.</p>
<p>What makes <em>determinant-driven</em> approaches possible here is:</p>
<ul class="simple">
<li>the fact that selected <abbr title="Configuration Interaction">CI</abbr> methods will keep the number of determinants small
enough, orders of magnitude smaller than in <em>a priori</em> selected methods for
wave functions with equal energies,</li>
<li>an efficient way to compare determinants in order to extract the
corresponding excitation operators <a class="reference internal" href="#scemama-2013" id="id7">[A7]</a>,</li>
<li>an intense filtering of the internal space to avoid as much as possible
determinant comparisons of disconnected determinants,</li>
<li>a fast retrieval of the corresponding two-electron integrals in memory.</li>
</ul>
<div class="section" id="simple-algorithm">
<h2>Simple Algorithm<a class="headerlink" href="#simple-algorithm" title="Permalink to this headline"></a></h2>
<p>The variational wave function <span class="math notranslate nohighlight">\(|\Psi^{(n)}\rangle\)</span> is defined over a set of determinants
<span class="math notranslate nohighlight">\(\{|D_I\rangle\}^{(n)}\)</span> in which we diagonalize <span class="math notranslate nohighlight">\(\hat H\)</span>.</p>
<div class="math notranslate nohighlight">
\[|\Psi^{(n)}\rangle = \sum_{I} c_I^{(n)} |D_I\rangle\]</div>
<p>The determinants in <span class="math notranslate nohighlight">\(\{|D_I\rangle\}^{(n)}\)</span> will be characterized as <strong>internal</strong>.</p>
<ol class="arabic">
<li><p class="first">For all <strong>external</strong> determinants <span class="math notranslate nohighlight">\(|\alpha \rangle\)</span> <span class="math notranslate nohighlight">\(\notin\)</span> <span class="math notranslate nohighlight">\(\{|D_I\rangle\}^{(n)}\)</span>, compute the
Epstein-Nesbet second-order perturbative contribution to the energy</p>
<div class="math notranslate nohighlight">
\[e_\alpha = \frac{ \langle \Psi^{(n)}| {\hat H} | \alpha \rangle^2 }{E^{(n)} - \langle \alpha | {\hat H} | \alpha \rangle }.\]</div>
<p><span class="math notranslate nohighlight">\(E^{(n)}\)</span> is the variational energy of the wave function at the current
iteration. Note that another perturbation theory could be used to estimate
<span class="math notranslate nohighlight">\(e_\alpha\)</span>.</p>
</li>
<li><p class="first">An estimate of the total missing correlation energy can be computed
by summing all the <span class="math notranslate nohighlight">\(e_\alpha\)</span> contributions</p>
<div class="math notranslate nohighlight">
\[\begin{split}E_\text{PT2} &amp; = \sum_{\alpha} e_\alpha \\
E_\text{FCI} &amp; \approx E + E_\text{PT2}\end{split}\]</div>
</li>
<li><p class="first"><span class="math notranslate nohighlight">\(\{ |\alpha \rangle \}_\star ^{(n)}\)</span>, the subset of determinants <span class="math notranslate nohighlight">\(|\alpha \rangle\)</span> with the largest
contributions <span class="math notranslate nohighlight">\(e_\alpha\)</span>, is added to the variational space</p>
<div class="math notranslate nohighlight">
\[\{ |D_I \rangle \}^{(n+1)} = \{|D_I\rangle\}^{(n)} \cup \{ |\alpha\rangle \}_\star^{(n)}\]</div>
</li>
<li><p class="first">Go to iteration n+1, or exit on some criterion (number of determinants in
the wave function, low <span class="math notranslate nohighlight">\(E_\text{PT2}\)</span>, …).</p>
</li>
</ol>
<p>Of course, such a procedure can be applied on any state and therefore can allow to treat both ground and excited states.</p>
</div>
<div class="section" id="stochastic-approximations-for-the-selection-and-the-computation-of-ept">
<h2>Stochastic approximations for the selection and the computation of <span class="math notranslate nohighlight">\(E_\text{PT2}\)</span><a class="headerlink" href="#stochastic-approximations-for-the-selection-and-the-computation-of-ept" title="Permalink to this headline"></a></h2>
<p>The simple algorithm would be too slow to make calculations possible. Instead,
the <em>Quantum Package</em> uses a stochastic algorithm <a class="reference internal" href="../appendix/research.html#garniron-2017-2" id="id8">[13]</a> in order to compute
efficiently the <span class="math notranslate nohighlight">\(E_\text{PT2}\)</span> and to select on-the-fly the best Slater determinants.</p>
<p>In such a way, the selection step introduces no extra cost with respect to the <span class="math notranslate nohighlight">\(E_\text{PT2}\)</span> calculation and the <span class="math notranslate nohighlight">\(E_\text{PT2}\)</span>
itself is unbiased but associated with a statistical error bar rapidly converging.</p>
</div>
<div class="section" id="deterministic-approximations-for-the-selection">
<h2>Deterministic approximations for the selection<a class="headerlink" href="#deterministic-approximations-for-the-selection" title="Permalink to this headline"></a></h2>
<p>The following description was used in a previous version of the <abbr title="Configuration Interaction using a Perturbative Selection">CIPSI</abbr> algorithm
which was less efficient. Nonetheless, it introduces the notions of <strong>generator</strong> and <strong>selector</strong> determinants
which are much more general than the <abbr title="Configuration Interaction using a Perturbative Selection">CIPSI</abbr> algorithm that targets the <abbr title="Full Configuration Interaction">FCI</abbr> and can be used to realize virtually
<strong>any kind of CI in a selected way</strong>.</p>
<p>We define <strong>generator</strong> determinants, as determinants of the internal space
from which the <span class="math notranslate nohighlight">\(|\alpha \rangle\)</span> are generated.
We then define <strong>selector</strong> determinants, a truncated wave function
used in the computation of <span class="math notranslate nohighlight">\(e_\alpha\)</span>.</p>
<p>For calculations in the <abbr title="Full Configuration Interaction">FCI</abbr> space, the determinants are sorted by decreasing
<span class="math notranslate nohighlight">\(|c_I|^2\)</span>, and thresholds are used on the squared norm of the wave function.
The default is to use <a class="reference internal" href="../modules/determinants.html#cmdoption-determinants-arg-threshold-generators"><code class="xref std std-option docutils literal notranslate"><span class="pre">determinants</span> <span class="pre">threshold_generators</span></code></a> = 0.99 for
the generators, and <code class="xref std std-option docutils literal notranslate"><span class="pre">determinants</span> <span class="pre">threshold_selectors</span></code> = 0.999 for the
selectors.</p>
<p>This is nothing but the 3-class <abbr title="Configuration Interaction using a Perturbative Selection">CIPSI</abbr> approximation to accelerate the selection,
<a class="reference internal" href="#evangelisti-1983" id="id9">[A8]</a> where instead of generating all possible <span class="math notranslate nohighlight">\(|\alpha \rangle\)</span>,
we only generate a subset which are likely to be selected.</p>
<p>The computation of <span class="math notranslate nohighlight">\(E_\text{PT2}\)</span> using a truncated wave function is biased,
so if an accurate estimate of the <abbr title="Full Configuration Interaction">FCI</abbr> energy is desired, it is preferable
to recompute <span class="math notranslate nohighlight">\(E_\text{PT2}\)</span> with the hybrid deterministic/stochastic algorithm
<a class="reference internal" href="#garniron-2017b" id="id10">[A9]</a> which is unbiased (this is the default).</p>
</div>
<div class="section" id="modifying-the-selection-space">
<h2>Modifying the selection space<a class="headerlink" href="#modifying-the-selection-space" title="Permalink to this headline"></a></h2>
<p>By changing the definition of generators, and the rules for the generation of
the <span class="math notranslate nohighlight">\(|\alpha \rangle\)</span>, it is easy to define selected variants of traditional <abbr title="Configuration Interaction">CI</abbr> methods.</p>
<p>For example, if one defines the <abbr title="Hartree-Fock">HF</abbr> determinant as the only generator,
one will produce a selected <abbr title="Configuration Interaction with Single and Double Excitations">CISD</abbr>. If one also changes the rules for the generation
to generate only the double excitations, one will have a selected <abbr title="Configuration Interaction with Double Excitations">CID</abbr>.</p>
<p>The generators can also be chosen as determinants belonging to a <abbr title="Complete Active Space">CAS</abbr>. If the
rules allow only for excitations inside the <abbr title="Complete Active Space">CAS</abbr>, we obtain a selected
<abbr title="Complete Active Space">CAS</abbr> <abbr title="Configuration Interaction">CI</abbr>. If the rules allow for excitations in the <abbr title="Full Configuration Interaction">FCI</abbr> space, we obtain
a selected <abbr title="Complete Active Space plus all Singles and Doubles">CAS-SD</abbr>. And if one add the rule to prevent for doing double
excitations with two holes and two particles outside of the active space, one
obtains a selected <abbr title="Difference Dedicated Configuration Interaction">DDCI</abbr> method.</p>
<p>All such things can be done very easily when programming the <em>Quantum Package</em>.</p>
<hr class="docutils" />
<p id="bibtex-bibliography-intro/selected_ci-0"><table class="docutils citation" frame="void" id="bytautas-2009" rules="none">
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<tr><td class="label"><a class="fn-backref" href="#id1">[A1]</a></td><td>Laimutis Bytautas and Klaus Ruedenberg. A priori identification of configurational deadwood. <em>Chemical Physics</em>, 356(1-3):64–75, feb 2009. URL: <a class="reference external" href="https://doi.org/10.1016%2Fj.chemphys.2008.11.021">https://doi.org/10.1016%2Fj.chemphys.2008.11.021</a>, <a class="reference external" href="https://doi.org/10.1016/j.chemphys.2008.11.021">doi:10.1016/j.chemphys.2008.11.021</a>.</td></tr>
</tbody>
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<tr><td class="label"><a class="fn-backref" href="#id2">[A2]</a></td><td>James&nbsp;S.M. Anderson, Farnaz Heidar-Zadeh, and Paul&nbsp;W. Ayers. Breaking the curse of dimension for the electronic schrodinger equation with functional analysis. <em>Computational and Theoretical Chemistry</em>, 1142:66–77, oct 2018. URL: <a class="reference external" href="https://doi.org/10.1016%2Fj.comptc.2018.08.017">https://doi.org/10.1016%2Fj.comptc.2018.08.017</a>, <a class="reference external" href="https://doi.org/10.1016/j.comptc.2018.08.017">doi:10.1016/j.comptc.2018.08.017</a>.</td></tr>
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<tr><td class="label"><a class="fn-backref" href="#id3">[A3]</a></td><td>Charles&nbsp;F. Bender and Ernest&nbsp;R. Davidson. Studies in configuration interaction: the first-row diatomic hydrides. <em>Phys. Rev.</em>, 183(1):23–30, jul 1969. URL: <a class="reference external" href="http://dx.doi.org/10.1103/PhysRev.183.23">http://dx.doi.org/10.1103/PhysRev.183.23</a>, <a class="reference external" href="https://doi.org/10.1103/physrev.183.23">doi:10.1103/physrev.183.23</a>.</td></tr>
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<tr><td class="label"><a class="fn-backref" href="#id4">[A4]</a></td><td>J.&nbsp;L. Whitten and Melvyn Hackmeyer. Configuration interaction studies of ground and excited states of polyatomic molecules. i. the CI formulation and studies of formaldehyde. <em>The Journal of Chemical Physics</em>, 51(12):5584–5596, dec 1969. URL: <a class="reference external" href="https://doi.org/10.1063%2F1.1671985">https://doi.org/10.1063%2F1.1671985</a>, <a class="reference external" href="https://doi.org/10.1063/1.1671985">doi:10.1063/1.1671985</a>.</td></tr>
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<tr><td class="label"><a class="fn-backref" href="#id5">[A5]</a></td><td>B.&nbsp;Huron, J.&nbsp;P. Malrieu, and P.&nbsp;Rancurel. Iterative perturbation calculations of ground and excited state energies from multiconfigurational zeroth-order wavefunctions. <em>The Journal of Chemical Physics</em>, 58(12):5745–5759, jun 1973. URL: <a class="reference external" href="https://doi.org/10.1063%2F1.1679199">https://doi.org/10.1063%2F1.1679199</a>, <a class="reference external" href="https://doi.org/10.1063/1.1679199">doi:10.1063/1.1679199</a>.</td></tr>
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<tr><td class="label"><a class="fn-backref" href="#id6">[A6]</a></td><td>Peter&nbsp;J. Knowles and Nicholas&nbsp;C Handy. A new determinant-based full configuration interaction method. <em>Chem. Phys. Letters</em>, 111:315–321, 1984.</td></tr>
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<tr><td class="label"><a class="fn-backref" href="#id7">[A7]</a></td><td>A.&nbsp;Scemama and E.&nbsp;Giner. An efficient implementation of Slater-Condon rules. <em>ArXiv [physics.comp-ph]</em>, pages 1311.6244, November 2013. URL: <a class="reference external" href="https://arxiv.org/abs/1311.6244">https://arxiv.org/abs/1311.6244</a>.</td></tr>
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<tr><td class="label"><a class="fn-backref" href="#id9">[A8]</a></td><td>Stefano Evangelisti, Jean-Pierre Daudey, and Jean-Paul Malrieu. Convergence of an improved CIPSI algorithm. <em>Chemical Physics</em>, 75(1):91–102, feb 1983. URL: <a class="reference external" href="https://doi.org/10.1016%2F0301-0104%2883%2985011-3">https://doi.org/10.1016%2F0301-0104%2883%2985011-3</a>, <a class="reference external" href="https://doi.org/10.1016/0301-0104(83)85011-3">doi:10.1016/0301-0104(83)85011-3</a>.</td></tr>
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<tr><td class="label"><a class="fn-backref" href="#id10">[A9]</a></td><td>Yann Garniron, Anthony Scemama, Pierre-François Loos, and Michel Caffarel. Hybrid stochastic-deterministic calculation of the second-order perturbative contribution of multireference perturbation theory. <em>The Journal of Chemical Physics</em>, 147(3):034101, jul 2017. URL: <a class="reference external" href="https://doi.org/10.1063%2F1.4992127">https://doi.org/10.1063%2F1.4992127</a>, <a class="reference external" href="https://doi.org/10.1063/1.4992127">doi:10.1063/1.4992127</a>.</td></tr>
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