for some reason your week 1 pca ipynb file is throwing the following errors:

======================================================================
FAIL: test_cov (week1_tests.Test)

Traceback (most recent call last):
File "/tmp/autograde_hgp2oj5j/week1_tests.py", line 32, in test_cov
np.testing.assert_allclose(result, cov(X))
File "/opt/conda/lib/python3.7/site-packages/numpy/testing/_private/utils.py", line 1533, in assert_allclose
verbose=verbose, header=header, equal_nan=equal_nan)
File "/opt/conda/lib/python3.7/site-packages/numpy/testing/_private/utils.py", line 765, in assert_array_compare
raise AssertionError(msg)
AssertionError:
Not equal to tolerance rtol=1e-07, atol=0

(shapes (10, 10), (2, 2) mismatch)
x: array([[ 1.007994e-01, -1.389557e-01, -2.606233e-06, 1.288654e-01,
-1.606550e-01, 3.670272e-04, 3.421331e-01, -1.845613e-01,
-2.106666e-01, 8.005167e-02],...
y: array([[0.819312, 0.33251 ],
[0.33251 , 0.931471]])

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/tmp/autograde_hgp2oj5j/week1_tests.py", line 40, in test_cov
np.testing.assert_allclose(result, cov(X))
File "/opt/conda/lib/python3.7/site-packages/numpy/testing/_private/utils.py", line 1533, in assert_allclose
verbose=verbose, header=header, equal_nan=equal_nan)
File "/opt/conda/lib/python3.7/site-packages/numpy/testing/_private/utils.py", line 765, in assert_array_compare
raise AssertionError(msg)
AssertionError:
Not equal to tolerance rtol=1e-07, atol=0

(shapes (10, 10), (2, 2) mismatch)
x: array([[ 1.007994e-01, -1.389557e-01, -2.606233e-06, 1.288654e-01,
-1.606550e-01, 3.670272e-04, 3.421331e-01, -1.845613e-01,
-2.106666e-01, 8.005167e-02],...
y: array([[0.910347, 0.369456],
[0.369456, 1.034968]])

======================================================================
FAIL: test_mean (week1_tests.Test)

Traceback (most recent call last):
File "/tmp/autograde_hgp2oj5j/week1_tests.py", line 19, in test_mean
np.testing.assert_allclose(result, expected, rtol=1e-5)
File "/opt/conda/lib/python3.7/site-packages/numpy/testing/_private/utils.py", line 1533, in assert_allclose
verbose=verbose, header=header, equal_nan=equal_nan)
File "/opt/conda/lib/python3.7/site-packages/numpy/testing/_private/utils.py", line 765, in assert_array_compare
raise AssertionError(msg)
AssertionError:
Not equal to tolerance rtol=1e-05, atol=0

(shapes (10, 1), (2,) mismatch)
x: array([[ 0.179225],
[ 1.085359],
[-0.234145],...
y: array([-0.184724, -0.157873])

Ran 4 tests in 0.551s

FAILED (failures=2)

Do you know how to fix them?