refactor: replace Anaconda to Miniconda

%% Cell type:markdown id: tags:

# Tutorial Part 2: Learning MNIST Digit Classifiers

In the previous tutorial, we learned some basics of how to load data into DeepChem and how to use the basic DeepChem objects to load and manipulate this data. In this tutorial, you'll put the parts together and learn how to train a basic image classification model in DeepChem. You might ask, why are we bothering to learn this material in DeepChem? Part of the reason is that image processing is an increasingly important part of AI for the life sciences. So learning how to train image processing models will be very useful for using some of the more advanced DeepChem features.

The MNIST dataset contains handwritten digits along with their human annotated labels. The learning challenge for this dataset is to train a model that maps the digit image to its true label. MNIST has been a standard benchmark for machine learning for decades at this point.

![MNIST](mnist_examples.png)

![MNIST](https://github.com/deepchem/deepchem/blob/master/examples/tutorials/mnist_examples.png?raw=1)

## Colab

This tutorial and the rest in this sequence are designed to be done in Google colab. If you'd like to open this notebook in colab, you can use the following link.

[![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/deepchem/deepchem/blob/master/examples/tutorials/02_Learning_MNIST_Digit_Classifiers.ipynb)

## Setup

We recommend running this tutorial on Google colab. You'll need to run the following cell of installation commands on Colab to get your environment set up. If you'd rather run the tutorial locally, make sure you don't run these commands (since they'll download and install a new Anaconda python setup)

%% Cell type:code id: tags:

``` python

!wget -c https://repo.anaconda.com/archive/Anaconda3-2019.10-Linux-x86_64.sh

!chmod +x Anaconda3-2019.10-Linux-x86_64.sh

!bash ./Anaconda3-2019.10-Linux-x86_64.sh -b -f -p /usr/local

``` 

%%capture

%tensorflow_version 1.x

!wget -c https://repo.anaconda.com/miniconda/Miniconda3-latest-Linux-x86_64.sh

!chmod +x Miniconda3-latest-Linux-x86_64.sh

!bash ./Miniconda3-latest-Linux-x86_64.sh -b -f -p /usr/local

!conda install -y -c deepchem -c rdkit -c conda-forge -c omnia deepchem-gpu=2.3.0

import sys

sys.path.append('/usr/local/lib/python3.7/site-packages/')

import deepchem as dc

```

%% Cell type:code id: tags:

``` python

``` 

from tensorflow.examples.tutorials.mnist import input_data

```

%% Output

%% Cell type:code id: tags:

``` python

``` 

# TODO: This is deprecated. Let's replace with a DeepChem native loader for maintainability.

mnist = input_data.read_data_sets("MNIST_data/", one_hot=True)

```

%% Output

    WARNING:tensorflow:From <ipython-input-3-a839aeb82f4b>:1: read_data_sets (from tensorflow.contrib.learn.python.learn.datasets.mnist) is deprecated and will be removed in a future version.

    Instructions for updating:

    Please use alternatives such as official/mnist/dataset.py from tensorflow/models.

    WARNING:tensorflow:From /tensorflow-1.15.2/python3.6/tensorflow_core/contrib/learn/python/learn/datasets/mnist.py:260: maybe_download (from tensorflow.contrib.learn.python.learn.datasets.base) is deprecated and will be removed in a future version.

    Instructions for updating:

    Please write your own downloading logic.

    WARNING:tensorflow:From /tensorflow-1.15.2/python3.6/tensorflow_core/contrib/learn/python/learn/datasets/base.py:252: _internal_retry.<locals>.wrap.<locals>.wrapped_fn (from tensorflow.contrib.learn.python.learn.datasets.base) is deprecated and will be removed in a future version.

    Instructions for updating:

    Please use urllib or similar directly.

    Successfully downloaded train-images-idx3-ubyte.gz 9912422 bytes.

    WARNING:tensorflow:From /tensorflow-1.15.2/python3.6/tensorflow_core/contrib/learn/python/learn/datasets/mnist.py:262: extract_images (from tensorflow.contrib.learn.python.learn.datasets.mnist) is deprecated and will be removed in a future version.

    Instructions for updating:

    Please use tf.data to implement this functionality.

    Extracting MNIST_data/train-images-idx3-ubyte.gz

    Successfully downloaded train-labels-idx1-ubyte.gz 28881 bytes.

    WARNING:tensorflow:From /tensorflow-1.15.2/python3.6/tensorflow_core/contrib/learn/python/learn/datasets/mnist.py:267: extract_labels (from tensorflow.contrib.learn.python.learn.datasets.mnist) is deprecated and will be removed in a future version.

    Instructions for updating:

    Please use tf.data to implement this functionality.

    Extracting MNIST_data/train-labels-idx1-ubyte.gz

    WARNING:tensorflow:From /tensorflow-1.15.2/python3.6/tensorflow_core/contrib/learn/python/learn/datasets/mnist.py:110: dense_to_one_hot (from tensorflow.contrib.learn.python.learn.datasets.mnist) is deprecated and will be removed in a future version.

    Instructions for updating:

    Please use tf.one_hot on tensors.

    Successfully downloaded t10k-images-idx3-ubyte.gz 1648877 bytes.

    Extracting MNIST_data/t10k-images-idx3-ubyte.gz

    Successfully downloaded t10k-labels-idx1-ubyte.gz 4542 bytes.

    Extracting MNIST_data/t10k-labels-idx1-ubyte.gz

    WARNING:tensorflow:From /tensorflow-1.15.2/python3.6/tensorflow_core/contrib/learn/python/learn/datasets/mnist.py:290: DataSet.__init__ (from tensorflow.contrib.learn.python.learn.datasets.mnist) is deprecated and will be removed in a future version.

    Instructions for updating:

    Please use alternatives such as official/mnist/dataset.py from tensorflow/models.

%% Cell type:code id: tags:

``` python

``` 

import deepchem as dc

import tensorflow as tf

from tensorflow.keras.layers import Reshape, Conv2D, Flatten, Dense, Softmax

```

%% Output

    /usr/local/lib/python3.6/dist-packages/sklearn/externals/joblib/__init__.py:15: FutureWarning: sklearn.externals.joblib is deprecated in 0.21 and will be removed in 0.23. Please import this functionality directly from joblib, which can be installed with: pip install joblib. If this warning is raised when loading pickled models, you may need to re-serialize those models with scikit-learn 0.21+.

      warnings.warn(msg, category=FutureWarning)

    WARNING:tensorflow:

    The TensorFlow contrib module will not be included in TensorFlow 2.0.

    For more information, please see:

      * https://github.com/tensorflow/community/blob/master/rfcs/20180907-contrib-sunset.md

      * https://github.com/tensorflow/addons

      * https://github.com/tensorflow/io (for I/O related ops)

    If you depend on functionality not listed there, please file an issue.

%% Cell type:code id: tags:

``` python

``` 

train = dc.data.NumpyDataset(mnist.train.images, mnist.train.labels)

valid = dc.data.NumpyDataset(mnist.validation.images, mnist.validation.labels)

```

%% Cell type:code id: tags:

``` python

``` 

keras_model = tf.keras.Sequential([

    Reshape((28, 28, 1)),

    Conv2D(filters=32, kernel_size=5, activation=tf.nn.relu),

    Conv2D(filters=64, kernel_size=5, activation=tf.nn.relu),

    Flatten(),

    Dense(1024, activation=tf.nn.relu),

    Dense(10),

    Softmax()

])

model = dc.models.KerasModel(keras_model, dc.models.losses.CategoricalCrossEntropy())

```

%% Cell type:code id: tags:

``` python

``` 

model.fit(train, nb_epoch=2)

```

%% Output

    WARNING:tensorflow:From /usr/local/lib/python3.7/site-packages/deepchem/models/keras_model.py:169: The name tf.Session is deprecated. Please use tf.compat.v1.Session instead.

    WARNING:tensorflow:From /usr/local/lib/python3.7/site-packages/deepchem/models/optimizers.py:76: The name tf.train.AdamOptimizer is deprecated. Please use tf.compat.v1.train.AdamOptimizer instead.

    WARNING:tensorflow:From /usr/local/lib/python3.7/site-packages/deepchem/models/keras_model.py:258: The name tf.global_variables is deprecated. Please use tf.compat.v1.global_variables instead.

    WARNING:tensorflow:From /usr/local/lib/python3.7/site-packages/deepchem/models/keras_model.py:260: The name tf.variables_initializer is deprecated. Please use tf.compat.v1.variables_initializer instead.

    WARNING:tensorflow:From /usr/local/lib/python3.7/site-packages/deepchem/models/keras_model.py:200: The name tf.placeholder is deprecated. Please use tf.compat.v1.placeholder instead.

    WARNING:tensorflow:From /tensorflow-1.15.2/python3.6/tensorflow_core/python/ops/resource_variable_ops.py:1630: calling BaseResourceVariable.__init__ (from tensorflow.python.ops.resource_variable_ops) with constraint is deprecated and will be removed in a future version.

    Instructions for updating:

    If using Keras pass *_constraint arguments to layers.

    0.0

%% Cell type:code id: tags:

``` python

``` 

from sklearn.metrics import roc_curve, auc

import numpy as np

print("Validation")

prediction = np.squeeze(model.predict_on_batch(valid.X))

fpr = dict()

tpr = dict()

roc_auc = dict()

for i in range(10):

    fpr[i], tpr[i], thresh = roc_curve(valid.y[:, i], prediction[:, i])

    roc_auc[i] = auc(fpr[i], tpr[i])

    print("class %s:auc=%s" % (i, roc_auc[i]))

```

%% Output

    Validation

    class 0:auc=0.9998836328172079

    class 1:auc=0.9999571662641497

    class 2:auc=0.9998310516219043

    class 3:auc=0.9999563446718672

    class 4:auc=0.9999418111793702

    class 5:auc=0.9995639983771051

    class 6:auc=0.9998478260194437

    class 7:auc=0.9998357507660879

    class 8:auc=0.9999599342922393

    class 9:auc=0.9998551553268534

    class 0:auc=0.9999057979948827

    class 1:auc=0.9999335476621387

    class 2:auc=0.9998705637425881

    class 3:auc=0.999911789233876

    class 4:auc=0.9999623237852037

    class 5:auc=0.9998804023326087

    class 6:auc=0.9998620230088834

    class 7:auc=0.9995460674157303

    class 8:auc=0.9998530924048773

    class 9:auc=0.9996017892577271

%% Cell type:markdown id: tags:

# Congratulations! Time to join the Community!

Congratulations on completing this tutorial notebook! If you enjoyed working through the tutorial, and want to continue working with DeepChem, we encourage you to finish the rest of the tutorials in this series. You can also help the DeepChem community in the following ways:

## Star DeepChem on [GitHub](https://github.com/deepchem/deepchem)

This helps build awareness of the DeepChem project and the tools for open source drug discovery that we're trying to build.

## Join the DeepChem Gitter

The DeepChem [Gitter](https://gitter.im/deepchem/Lobby) hosts a number of scientists, developers, and enthusiasts interested in deep learning for the life sciences. Join the conversation!