title: TensorFlow works although it is not installed
body: <p>After much trouble installing <code>TensorFlow</code> under Anaconda, I removed Anaconda completely and installed it again (64-bit Anaconda3 under Windows 10 with Python 3.8). To my great surprise, I can now import <code>TensorFlow</code> from Jupyter Notebook even though I have not installed <code>TensorFlow</code> under Anaconda yet and it is listed as &quot;not installed&quot; in the base environment. What magic is going on here?</p>
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