Fastai - Revisiting Titanic

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75. Titanic Fastai

from fastai import *
from fastai.tabular import * 
import numpy as np
import pandas as pd
import pandas as pd

train= pd.read_csv('https://raw.githubusercontent.com/rpi-techfundamentals/fall2018-materials/master/input/train.csv')
test = pd.read_csv('https://raw.githubusercontent.com/rpi-techfundamentals/fall2018-materials/master/input/test.csv')

#Create a categorical variable from the family count 
def family(x):
    if x < 2:
        return 'Single'
    elif x == 2:
        return 'Couple'
    elif x <= 4:
        return 'InterM'
    else:
        return 'Large'


for df in [train, test]:
    df['Title'] = df['Name'].str.split(',').str[1].str.split(' ').str[1]
    df['Title'] = df['Title'].replace(['Lady', 'the Countess', 'Countess', 'Capt', 'Col', 'Don', 'Dr', 'Major', 'Rev', 'Sir', 'Jonkheer', 'Dona', 'Ms', 'Mme', 'Mlle'], 'Rare')
    df['Age']=df['Age'].fillna(df['Age'].median())
    df['Fare']=df['Fare'].fillna(df['Fare'].median())
    df['Embarked']=df['Embarked'].fillna('S')
    df['NameLength'] = df['Name'].map(lambda x: len(x))
    df['FamilyS'] = df['SibSp'] + df['Parch'] + 1
    df['FamilyS'] = df['FamilyS'].apply(family)
train.isnull().sum(axis = 0)

PassengerId      0
Survived         0
Pclass           0
Name             0
Sex              0
Age              0
SibSp            0
Parch            0
Ticket           0
Fare             0
Cabin          687
Embarked         0
Title            0
NameLength       0
FamilyS          0
dtype: int64

train.head()

	PassengerId	Survived	Pclass	Name	Sex	Age	SibSp	Parch	Ticket	Fare	Cabin	Embarked	Title	NameLength	FamilyS
0	1	0	3	Braund, Mr. Owen Harris	male	22.0	1	0	A/5 21171	7.2500	NaN	S	Mr.	23	Couple
1	2	1	1	Cumings, Mrs. John Bradley (Florence Briggs Th...	female	38.0	1	0	PC 17599	71.2833	C85	C	Mrs.	51	Couple
2	3	1	3	Heikkinen, Miss. Laina	female	26.0	0	0	STON/O2. 3101282	7.9250	NaN	S	Miss.	22	Single
3	4	1	1	Futrelle, Mrs. Jacques Heath (Lily May Peel)	female	35.0	1	0	113803	53.1000	C123	S	Mrs.	44	Couple
4	5	0	3	Allen, Mr. William Henry	male	35.0	0	0	373450	8.0500	NaN	S	Mr.	24	Single

dep_var = 'Survived'
cat_names = ['Pclass', 'Sex', 'Embarked', 'Title', 'FamilyS']
cont_names = ['Age', 'Fare', 'SibSp', 'Parch', 'NameLength']
procs = [FillMissing, Categorify, Normalize]
test_data = (TabularList.from_df(test, path='.', cat_names=cat_names, cont_names=cont_names, procs=procs))

data = (TabularList.from_df(train, path='.', cat_names=cat_names, cont_names=cont_names, procs=procs)
                           .split_by_idx(list(range(0,200)))
                           .label_from_df(cols=dep_var)
                           .add_test(test_data, label=0)
                           .databunch())

#Shows the Data
data.show_batch()

Pclass	Sex	Embarked	Title	FamilyS	Age	Fare	SibSp	Parch	NameLength	target
2	male	S	Mr.	Couple	0.5653	-0.1432	0.5043	-0.4658	-0.4163	0
3	male	S	Mr.	Single	-0.3706	-0.4860	-0.4610	-0.4658	-0.6319	0
3	male	S	Mr.	Single	-0.1366	-0.4982	-0.4610	-0.4658	-0.5241	0
3	male	S	Mr.	Single	3.4510	-0.4883	-0.4610	-0.4658	-0.8475	0
3	male	S	Mr.	Couple	-0.9165	-0.5125	0.5043	-0.4658	-0.2008	0

#Define our Learner
learn = tabular_learner(data, layers=[300,100], metrics=accuracy)

learn.lr_find()
learn.recorder.plot()

LR Finder is complete, type {learner_name}.recorder.plot() to see the graph.

#fit the learner
learn.fit(7, 1e-2)  #Number of epocs and the learning rate. learn.save('final_train')

epoch	train_loss	valid_loss	accuracy	time
0	0.544682	0.566284	0.740000	00:00
1	0.490425	0.473522	0.845000	00:00
2	0.467682	0.453977	0.845000	00:00
3	0.448043	0.414292	0.830000	00:00
4	0.434118	0.406961	0.865000	00:00
5	0.424244	0.426844	0.855000	00:00
6	0.413750	0.411579	0.845000	00:00

#Show the results
learn.show_results()

Pclass	Sex	Embarked	Title	FamilyS	Age	Fare	SibSp	Parch	NameLength	target	prediction
3	male	S	Mr.	Couple	-0.6046	-0.4982	0.5043	-0.4658	-0.4163	0	0
1	female	C	Mrs.	Couple	0.6433	0.7144	0.5043	-0.4658	2.6017	1	1
3	female	S	Miss.	Single	-0.2926	-0.4855	-0.4610	-0.4658	-0.5241	1	0
1	female	S	Mrs.	Couple	0.4093	0.3700	0.5043	-0.4658	1.8472	1	1
3	male	S	Mr.	Single	0.4093	-0.4831	-0.4610	-0.4658	-0.3085	0	0

#This will get predictions
predictions, *_ = learn.get_preds(DatasetType.Test)
labels = to_np(np.argmax(predictions, 1))
labels.shape

(418,)

#Writing to File
submission=pd.DataFrame(test.loc[:,['PassengerId']])
submission['Survived']=labels
#Any files you save will be available in the output tab below

submission.to_csv('submission.csv', index=False)

from google.colab import files
files.download('submission.csv')