fix(cross): compute total squared covariance in PC space #221
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Before we computed the TSC in the original (physical) space which required computing a large covariance matrix. As a result, we ran out of memory even for datasets of moderate size.
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Before, we computed the TSC in the original (physical) space which required computing a large covariance matrix. As a result, we ran out of memory even for datasets of moderate size. Now we compute the TSC in PC space.