Delete sample_data

sample_data/README.md

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-This directory includes a few sample datasets to get you started.
-
-*   `california_housing_data*.csv` is California housing data from the 1990 US
-    Census; more information is available at:
-    https://developers.google.com/machine-learning/crash-course/california-housing-data-description
-
-*   `mnist_*.csv` is a small sample of the
-    [MNIST database](https://en.wikipedia.org/wiki/MNIST_database), which is
-    described at: http://yann.lecun.com/exdb/mnist/
-
-*   `anscombe.json` contains a copy of
-    [Anscombe's quartet](https://en.wikipedia.org/wiki/Anscombe%27s_quartet); it
-    was originally described in
-
-    Anscombe, F. J. (1973). 'Graphs in Statistical Analysis'. American
-    Statistician. 27 (1): 17-21. JSTOR 2682899.
-
-    and our copy was prepared by the
-    [vega_datasets library](https://github.com/altair-viz/vega_datasets/blob/4f67bdaad10f45e3549984e17e1b3088c731503d/vega_datasets/_data/anscombe.json).

sample_data/anscombe.json

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-[
-  {"Series":"I", "X":10.0, "Y":8.04},
-  {"Series":"I", "X":8.0, "Y":6.95},
-  {"Series":"I", "X":13.0, "Y":7.58},
-  {"Series":"I", "X":9.0, "Y":8.81},
-  {"Series":"I", "X":11.0, "Y":8.33},
-  {"Series":"I", "X":14.0, "Y":9.96},
-  {"Series":"I", "X":6.0, "Y":7.24},
-  {"Series":"I", "X":4.0, "Y":4.26},
-  {"Series":"I", "X":12.0, "Y":10.84},
-  {"Series":"I", "X":7.0, "Y":4.81},
-  {"Series":"I", "X":5.0, "Y":5.68},
-
-  {"Series":"II", "X":10.0, "Y":9.14},
-  {"Series":"II", "X":8.0, "Y":8.14},
-  {"Series":"II", "X":13.0, "Y":8.74},
-  {"Series":"II", "X":9.0, "Y":8.77},
-  {"Series":"II", "X":11.0, "Y":9.26},
-  {"Series":"II", "X":14.0, "Y":8.10},
-  {"Series":"II", "X":6.0, "Y":6.13},
-  {"Series":"II", "X":4.0, "Y":3.10},
-  {"Series":"II", "X":12.0, "Y":9.13},
-  {"Series":"II", "X":7.0, "Y":7.26},
-  {"Series":"II", "X":5.0, "Y":4.74},
-
-  {"Series":"III", "X":10.0, "Y":7.46},
-  {"Series":"III", "X":8.0, "Y":6.77},
-  {"Series":"III", "X":13.0, "Y":12.74},
-  {"Series":"III", "X":9.0, "Y":7.11},
-  {"Series":"III", "X":11.0, "Y":7.81},
-  {"Series":"III", "X":14.0, "Y":8.84},
-  {"Series":"III", "X":6.0, "Y":6.08},
-  {"Series":"III", "X":4.0, "Y":5.39},
-  {"Series":"III", "X":12.0, "Y":8.15},
-  {"Series":"III", "X":7.0, "Y":6.42},
-  {"Series":"III", "X":5.0, "Y":5.73},
-
-  {"Series":"IV", "X":8.0, "Y":6.58},
-  {"Series":"IV", "X":8.0, "Y":5.76},
-  {"Series":"IV", "X":8.0, "Y":7.71},
-  {"Series":"IV", "X":8.0, "Y":8.84},
-  {"Series":"IV", "X":8.0, "Y":8.47},
-  {"Series":"IV", "X":8.0, "Y":7.04},
-  {"Series":"IV", "X":8.0, "Y":5.25},
-  {"Series":"IV", "X":19.0, "Y":12.50},
-  {"Series":"IV", "X":8.0, "Y":5.56},
-  {"Series":"IV", "X":8.0, "Y":7.91},
-  {"Series":"IV", "X":8.0, "Y":6.89}
-]

sample_data/mnist_test.csv

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-size 18289443

sample_data/mnist_train_small.csv

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