Squashfs images can be unpacked in windows with 7-zip.
The main fork 7-zip doesn't support lz4 compression, but 
<a href="https://github.com/mcmilk/7-Zip-zstd/releases">this one</a> does.
<p>
In linux, they can be directly mounted or mounted with squashfuse.  For example, either:
<ul>
<li>mount directly with the command: <tt>sudo mount -o loop,ro image1.sq /mnt/image1</tt> (no additional software needed)
<li>mount with squashfuse:  <tt>mkdir image1; squashfuse image1.sq image1</tt>
</ul>


Files:
<dl>
<dt><a href="UCF-MAMA.sq">UCF-MAMA.sq</a> (296G) <dd>
contains the following two plus the visualization data
<dl>
<dt><a href="UCF-MAMA-test.zip">UCF-MAMA-test.zip</a> (31G) <dd>
contains the testing set.
<dt><a href="UCF-MAMA-train.zip">UCF-MAMA-train.zip</a> (118G)<dd>
contains the training set.
</dl>
<dt>
  <a href="mini_test_set.sq"> mini_test_set.sq</a> or
  <a href="mini_test_set.zip">mini_test_set.zip</a> (9G)
<dd>smaller test dataset
<dt><a href="sample_submission.zip">sample_submission.zip</a>
</dl>

9.1G	mini_test_set.sq
9.0G	mini_test_set.zip
24M	sample_submission.zip
296G	UCF-MAMA.sq
31G	UCF-MAMA-test.zip
118G	UCF-MAMA-train.zip