title: New anaconda environment starts with packages I didn't install
body: <p>I've been trying to resolve broken pytorch installations, and have made several fresh starts by deleting an environment with <code>conda remove -n &lt;env&gt; --all</code> and re-creating it. At some point I noticed that the freshly created environment is not &quot;fresh&quot; at all: when launching python from that environment, I was still able to <code>import</code> the packages from the removed environment of the same name, namely <code>pytorch</code>, which was not installed in the <code>base</code> environment (<code>activate base</code> followed by trying to import <code>pytorch</code> does not work, as expected). I have tried</p>
  <pre><code>conda create -n &lt;random name&gt;
  </code></pre>
  <p>and even the randomly named, empty environment has <code>pytorch</code> inexplicably installed. Running <code>conda clean --all</code> before creating the environment does not prevent this from happening.</p>
  <p>What is causing this, and how can I prevent this from happening?</p>