import numpy as np

# import pandas as pd

import theano

import theano.tensor as T

import layers

import cc_layers

import custom

import load_data

import realtime_augmentation as ra

import time

import csv

import os

import cPickle as pickle

from datetime import datetime, timedelta

# import matplotlib.pyplot as plt

# plt.ion()

# import utils

BATCH_SIZE = 16

NUM_INPUT_FEATURES = 3

LEARNING_RATE_SCHEDULE = {

}

MOMENTUM = 0.9

WEIGHT_DECAY = 0.0

CHUNK_SIZE = 10000 # 30000 # this should be a multiple of the batch size, ideally.

NUM_CHUNKS = 2500 # 3000 # 1500 # 600 # 600 # 600 # 500

VALIDATE_EVERY = 20 # 12 # 6 # 6 # 6 # 5 # validate only every 5 chunks. MUST BE A DIVISOR OF NUM_CHUNKS!!!

# else computing the analysis data does not work correctly, since it assumes that the validation set is still loaded.

NUM_CHUNKS_NONORM = 1 # train without normalisation for this many chunks, to get the weights in the right 'zone'.

# this should be only a few, just 1 hopefully suffices.

GEN_BUFFER_SIZE = 1

# # need to load the full training data anyway to extract the validation set from it.

# # alternatively we could create separate validation set files.

# DATA_TRAIN_PATH = "data/images_train_color_cropped33_singletf.npy.gz"

# DATA2_TRAIN_PATH = "data/images_train_color_8x_singletf.npy.gz"

# DATA_VALIDONLY_PATH = "data/images_validonly_color_cropped33_singletf.npy.gz"

# DATA2_VALIDONLY_PATH = "data/images_validonly_color_8x_singletf.npy.gz"

# DATA_TEST_PATH = "data/images_test_color_cropped33_singletf.npy.gz"

# DATA2_TEST_PATH = "data/images_test_color_8x_singletf.npy.gz"

TARGET_PATH = "predictions/final/try_convnet_cc_multirotflip_3x69r45_maxout2048.csv"

ANALYSIS_PATH = "analysis/final/try_convnet_cc_multirotflip_3x69r45_maxout2048.pkl"

# FEATURES_PATTERN = "features/try_convnet_chunked_ra_b3sched.%s.npy"

print "Set up data loading"

# TODO: adapt this so it loads the validation data from JPEGs and does the processing realtime

input_sizes = [(69, 69), (69, 69)]

ds_transforms = [

ra.build_ds_transform(3.0, target_size=input_sizes[0])

]

num_input_representations = len(ds_transforms)

augmentation_params = {

}

augmented_data_gen = ra.realtime_augmented_data_gen(num_chunks=NUM_CHUNKS, chunk_size=CHUNK_SIZE,

augmentation_params=augmentation_params, ds_transforms=ds_transforms,

target_sizes=input_sizes)

post_augmented_data_gen = ra.post_augment_brightness_gen(augmented_data_gen, std=0.5)

train_gen = load_data.buffered_gen_mp(post_augmented_data_gen, buffer_size=GEN_BUFFER_SIZE)

y_train = np.load("data/solutions_train.npy")

train_ids = load_data.train_ids

test_ids = load_data.test_ids

# split training data into training + a small validation set

num_train = len(train_ids)

num_test = len(test_ids)

num_valid = num_train // 10 # integer division

num_train -= num_valid

y_valid = y_train[num_train:]

y_train = y_train[:num_train]

valid_ids = train_ids[num_train:]

train_ids = train_ids[:num_train]

train_indices = np.arange(num_train)

valid_indices = np.arange(num_train, num_train + num_valid)

test_indices = np.arange(num_test)

def create_train_gen():

return load_data.buffered_gen_mp(data_gen_train, buffer_size=GEN_BUFFER_SIZE)

def create_valid_gen():

data_gen_valid = ra.realtime_fixed_augmented_data_gen(valid_indices, 'train',

ds_transforms=ds_transforms, chunk_size=CHUNK_SIZE, target_sizes=input_sizes)

return load_data.buffered_gen_mp(data_gen_valid, buffer_size=GEN_BUFFER_SIZE)

def create_test_gen():

data_gen_test = ra.realtime_fixed_augmented_data_gen(test_indices, 'test',

ds_transforms=ds_transforms, chunk_size=CHUNK_SIZE, target_sizes=input_sizes)

return load_data.buffered_gen_mp(data_gen_test, buffer_size=GEN_BUFFER_SIZE)

print "Preprocess validation data upfront"

start_time = time.time()

xs_valid = [[] for _ in xrange(num_input_representations)]

for data, length in create_valid_gen():

for x_valid_list, x_chunk in zip(xs_valid, data):

x_valid_list.append(x_chunk[:length])

xs_valid = [np.vstack(x_valid) for x_valid in xs_valid]

xs_valid = [x_valid.transpose(0, 3, 1, 2) for x_valid in xs_valid] # move the colour dimension up

print " took %.2f seconds" % (time.time() - start_time)

print "Build model"

l0s = layers.Input2DLayer(BATCH_SIZE, NUM_INPUT_FEATURES, input_sizes[0][0], input_sizes[0][1])

l1a = cc_layers.CudaConvnetConv2DLayer(l0s, n_filters=32, filter_size=6, weights_std=0.01, init_bias_value=0.1, dropout=0.5, partial_sum=1, untie_biases=True)

l1 = cc_layers.CudaConvnetPooling2DLayer(l1a, pool_size=2)

l2a = cc_layers.CudaConvnetConv2DLayer(l1, n_filters=64, filter_size=5, weights_std=0.01, init_bias_value=0.1, dropout=0.5, partial_sum=1, untie_biases=True)

l2 = cc_layers.CudaConvnetPooling2DLayer(l2a, pool_size=2)

l3a = cc_layers.CudaConvnetConv2DLayer(l2, n_filters=128, filter_size=3, weights_std=0.01, init_bias_value=0.1, dropout=0.5, partial_sum=1, untie_biases=True)

l3b = cc_layers.CudaConvnetConv2DLayer(l3a, n_filters=128, filter_size=3, pad=0, weights_std=0.1, init_bias_value=0.1, dropout=0.5, partial_sum=1, untie_biases=True)

l3 = cc_layers.CudaConvnetPooling2DLayer(l3b, pool_size=2)

l3s = cc_layers.ShuffleC01BToBC01Layer(l3)

j3 = layers.MultiRotMergeLayer(l3s, num_views=4) # 2) # merge convolutional parts

l4a = layers.DenseLayer(j3, n_outputs=2048, weights_std=0.001, init_bias_value=0.01, dropout=0.5, nonlinearity=layers.identity)

l4 = layers.FeatureMaxPoolingLayer(l4a, pool_size=2, feature_dim=1, implementation='reshape')

l5 = layers.DenseLayer(l4, n_outputs=2, weights_std=0.01, init_bias_value=0.1, dropout=0.5, nonlinearity=layers.identity)

l6 = layers.OutputLayer(l5, error_measure='mse')

train_loss_nonorm = l6.error(normalisation=False)

train_loss = l6.error() # but compute and print this!

valid_loss = l6.error(dropout_active=False)

all_parameters = layers.all_parameters(l6)

all_bias_parameters = layers.all_bias_parameters(l6)

xs_shared = [theano.shared(np.zeros((1,1,1,1), dtype=theano.config.floatX)) for _ in xrange(num_input_representations)]

y_shared = theano.shared(np.zeros((1,1), dtype=theano.config.floatX))

learning_rate = theano.shared(np.array(LEARNING_RATE_SCHEDULE[0], dtype=theano.config.floatX))

idx = T.lscalar('idx')

givens = {

}

# updates = layers.gen_updates(train_loss, all_parameters, learning_rate=LEARNING_RATE, momentum=MOMENTUM, weight_decay=WEIGHT_DECAY)

updates_nonorm = layers.gen_updates_nesterov_momentum_no_bias_decay(train_loss_nonorm, all_parameters, all_bias_parameters, learning_rate=learning_rate, momentum=MOMENTUM, weight_decay=WEIGHT_DECAY)

updates = layers.gen_updates_nesterov_momentum_no_bias_decay(train_loss, all_parameters, all_bias_parameters, learning_rate=learning_rate, momentum=MOMENTUM, weight_decay=WEIGHT_DECAY)

train_nonorm = theano.function([idx], train_loss_nonorm, givens=givens, updates=updates_nonorm)

train_norm = theano.function([idx], train_loss, givens=givens, updates=updates)

compute_loss = theano.function([idx], valid_loss, givens=givens) # dropout_active=False

compute_output = theano.function([idx], l6.predictions(dropout_active=False), givens=givens, on_unused_input='ignore') # not using the labels, so theano complains

compute_features = theano.function([idx], l4.output(dropout_active=False), givens=givens, on_unused_input='ignore')

print "Train model"

start_time = time.time()

prev_time = start_time

num_batches_valid = x_valid.shape[0] // BATCH_SIZE

losses_train = []

losses_valid = []

param_stds = []

for e in xrange(NUM_CHUNKS):

print "Chunk %d/%d" % (e + 1, NUM_CHUNKS)

chunk_data, chunk_length = train_gen.next()

y_chunk = chunk_data.pop() # last element is labels.

xs_chunk = chunk_data

# need to transpose the chunks to move the 'channels' dimension up

xs_chunk = [x_chunk.transpose(0, 3, 1, 2) for x_chunk in xs_chunk]

if e in LEARNING_RATE_SCHEDULE:

current_lr = LEARNING_RATE_SCHEDULE[e]

learning_rate.set_value(LEARNING_RATE_SCHEDULE[e])

print " setting learning rate to %.6f" % current_lr

# train without normalisation for the first # chunks.

if e >= NUM_CHUNKS_NONORM:

train = train_norm

else:

train = train_nonorm

print " load training data onto GPU"

for x_shared, x_chunk in zip(xs_shared, xs_chunk):

x_shared.set_value(x_chunk)

y_shared.set_value(y_chunk)

num_batches_chunk = x_chunk.shape[0] // BATCH_SIZE

# import pdb; pdb.set_trace()

print " batch SGD"

losses = []

for b in xrange(num_batches_chunk):

# if b % 1000 == 0:

# print " batch %d/%d" % (b + 1, num_batches_chunk)

loss = train(b)

losses.append(loss)

# print " loss: %.6f" % loss

mean_train_loss = np.sqrt(np.mean(losses))

print " mean training loss (RMSE):\t\t%.6f" % mean_train_loss

losses_train.append(mean_train_loss)

# store param stds during training

param_stds.append([p.std() for p in layers.get_param_values(l6)])

if ((e + 1) % VALIDATE_EVERY) == 0:

print

print "VALIDATING"

print " load validation data onto GPU"

for x_shared, x_valid in zip(xs_shared, xs_valid):

x_shared.set_value(x_valid)

y_shared.set_value(y_valid)

print " compute losses"

losses = []

for b in xrange(num_batches_valid):

# if b % 1000 == 0:

# print " batch %d/%d" % (b + 1, num_batches_valid)

loss = compute_loss(b)

losses.append(loss)

mean_valid_loss = np.sqrt(np.mean(losses))

print " mean validation loss (RMSE):\t\t%.6f" % mean_valid_loss

losses_valid.append(mean_valid_loss)

now = time.time()

time_since_start = now - start_time

time_since_prev = now - prev_time

prev_time = now

est_time_left = time_since_start * (float(NUM_CHUNKS - (e + 1)) / float(e + 1))

eta = datetime.now() + timedelta(seconds=est_time_left)

eta_str = eta.strftime("%c")

print " %s since start (%.2f s)" % (load_data.hms(time_since_start), time_since_prev)

print " estimated %s to go (ETA: %s)" % (load_data.hms(est_time_left), eta_str)

print

del chunk_data, xs_chunk, x_chunk, y_chunk, xs_valid, x_valid # memory cleanup

print "Compute predictions on validation set for analysis in batches"

predictions_list = []

for b in xrange(num_batches_valid):

# if b % 1000 == 0:

# print " batch %d/%d" % (b + 1, num_batches_valid)

predictions = compute_output(b)

predictions_list.append(predictions)

all_predictions = np.vstack(predictions_list)

# postprocessing: clip all predictions to 0-1

all_predictions[all_predictions > 1] = 1.0

all_predictions[all_predictions < 0] = 0.0

print "Write validation set predictions to %s" % ANALYSIS_PATH

with open(ANALYSIS_PATH, 'w') as f:

pickle.dump({

'ids': valid_ids[:num_batches_valid * BATCH_SIZE], # note that we need to truncate the ids to a multiple of the batch size.

'predictions': all_predictions,

'targets': y_valid,

'mean_train_loss': mean_train_loss,

'mean_valid_loss': mean_valid_loss,

'time_since_start': time_since_start,

'losses_train': losses_train,

'losses_valid': losses_valid,

'param_values': layers.get_param_values(l6),

'param_stds': param_stds,

}, f, pickle.HIGHEST_PROTOCOL)

del predictions_list, all_predictions # memory cleanup

# print "Loading test data"

# x_test = load_data.load_gz(DATA_TEST_PATH)

# x2_test = load_data.load_gz(DATA2_TEST_PATH)

# test_ids = np.load("data/test_ids.npy")

# num_test = x_test.shape[0]

# x_test = x_test.transpose(0, 3, 1, 2) # move the colour dimension up.

# x2_test = x2_test.transpose(0, 3, 1, 2)

# create_test_gen = lambda: load_data.array_chunker_gen([x_test, x2_test], chunk_size=CHUNK_SIZE, loop=False, truncate=False, shuffle=False)

print "Computing predictions on test data"

predictions_list = []

for e, (xs_chunk, chunk_length) in enumerate(create_test_gen()):

print "Chunk %d" % (e + 1)

xs_chunk = [x_chunk.transpose(0, 3, 1, 2) for x_chunk in xs_chunk] # move the colour dimension up.

for x_shared, x_chunk in zip(xs_shared, xs_chunk):

x_shared.set_value(x_chunk)

num_batches_chunk = int(np.ceil(chunk_length / float(BATCH_SIZE))) # need to round UP this time to account for all data

# make predictions for testset, don't forget to cute off the zeros at the end

for b in xrange(num_batches_chunk):

# if b % 1000 == 0:

# print " batch %d/%d" % (b + 1, num_batches_chunk)

predictions = compute_output(b)

predictions_list.append(predictions)

all_predictions = np.vstack(predictions_list)

all_predictions = all_predictions[:num_test] # truncate back to the correct length

# postprocessing: clip all predictions to 0-1

all_predictions[all_predictions > 1] = 1.0

all_predictions[all_predictions < 0] = 0.0

print "Write predictions to %s" % TARGET_PATH

# test_ids = np.load("data/test_ids.npy")

with open(TARGET_PATH, 'wb') as csvfile:

writer = csv.writer(csvfile) # , delimiter=',', quoting=csv.QUOTE_MINIMAL)

# write header

writer.writerow(['GalaxyID', 'Class1.1', 'Class1.2', 'Class1.3', 'Class2.1', 'Class2.2', 'Class3.1', 'Class3.2', 'Class4.1', 'Class4.2', 'Class5.1', 'Class5.2', 'Class5.3', 'Class5.4', 'Class6.1', 'Class6.2', 'Class7.1', 'Class7.2', 'Class7.3', 'Class8.1', 'Class8.2', 'Class8.3', 'Class8.4', 'Class8.5', 'Class8.6', 'Class8.7', 'Class9.1', 'Class9.2', 'Class9.3', 'Class10.1', 'Class10.2', 'Class10.3', 'Class11.1', 'Class11.2', 'Class11.3', 'Class11.4', 'Class11.5', 'Class11.6'])

# write data

for k in xrange(test_ids.shape[0]):

row = [test_ids[k]] + all_predictions[k].tolist()

writer.writerow(row)

print "Gzipping..."

os.system("gzip -c %s > %s.gz" % (TARGET_PATH, TARGET_PATH))

del all_predictions, predictions_list, xs_chunk, x_chunk # memory cleanup

# # need to reload training data because it has been split and shuffled.

# # don't need to reload test data

# x_train = load_data.load_gz(DATA_TRAIN_PATH)

# x2_train = load_data.load_gz(DATA2_TRAIN_PATH)

# x_train = x_train.transpose(0, 3, 1, 2) # move the colour dimension up

# x2_train = x2_train.transpose(0, 3, 1, 2)

# train_gen_features = load_data.array_chunker_gen([x_train, x2_train], chunk_size=CHUNK_SIZE, loop=False, truncate=False, shuffle=False)

# test_gen_features = load_data.array_chunker_gen([x_test, x2_test], chunk_size=CHUNK_SIZE, loop=False, truncate=False, shuffle=False)

# for name, gen, num in zip(['train', 'test'], [train_gen_features, test_gen_features], [x_train.shape[0], x_test.shape[0]]):

# print "Extracting feature representations for all galaxies: %s" % name

# features_list = []

# for e, (xs_chunk, chunk_length) in enumerate(gen):

# print "Chunk %d" % (e + 1)

# x_chunk, x2_chunk = xs_chunk

# x_shared.set_value(x_chunk)

# x2_shared.set_value(x2_chunk)

# num_batches_chunk = int(np.ceil(chunk_length / float(BATCH_SIZE))) # need to round UP this time to account for all data

# # compute features for set, don't forget to cute off the zeros at the end

# for b in xrange(num_batches_chunk):

# if b % 1000 == 0:

# print " batch %d/%d" % (b + 1, num_batches_chunk)

# features = compute_features(b)

# features_list.append(features)

# all_features = np.vstack(features_list)

# all_features = all_features[:num] # truncate back to the correct length

# features_path = FEATURES_PATTERN % name

# print " write features to %s" % features_path

# np.save(features_path, all_features)

print "Done!"