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require "shainet"

training_data = [
  [[0, 0], [0]],
  [[1, 0], [1]],
  [[0, 1], [1]],
  [[1, 1], [0]],
]
# Initialize a new network
xor = SHAInet::Network.new
# Add a new layer of the input type with 2 neurons and classic neuron type (memory)
xor.add_layer(:input, 2, :memory, SHAInet.sigmoid)
# Add a new layer of the hidden type with 2 neurons and classic neuron type (memory)
xor.add_layer(:hidden, 2, :memory, SHAInet.sigmoid)
# Add a new layer of the output type with 1 neurons and classic neuron type (memory)
xor.add_layer(:output, 1, :memory, SHAInet.sigmoid)
# Fully connect the network layers
xor.fully_connect

# Adjust network parameters
xor.learning_rate = 0.7
xor.momentum = 0.3

# data, training_type, cost_function, activation_function, epochs, error_threshold (sum of errors), learning_rate, momentum)
xor.train(
      data: training_data,
      training_type: :sgdm,
      cost_function: :mse,
      epochs: 5000,
      error_threshold: 0.000001,
      log_each: 1000)

# Run the trained network
xor.run([0, 0])

# Create a new Data object based on a CSV
data = SHAInet::Data.new_with_csv_input_target("iris.csv", 0..3, 4)

# Split the data in a training set and a test set
training_set, test_set = data.split(0.67)

# Initiate a new network
iris = SHAInet::Network.new

# Add layers
iris.add_layer(:input, 4, :memory, SHAInet.sigmoid)
iris.add_layer(:hidden, 5, :memory, SHAInet.sigmoid)
iris.add_layer(:output, 3, :memory, SHAInet.sigmoid)
iris.fully_connect

# Adjust network parameters
xor.learning_rate = 0.7
xor.momentum = 0.3

# Train the network
iris.train_batch(
      data: normalized.data.shuffle,
      training_type: :adam,
      cost_function: :mse,
      epochs: 20000,
      error_threshold: 0.000001,
      log_each: 1000)

# Test the network's performance
iris.test(test_set)

# Load training data (partial dataset)
raw_data = Array(Array(Float64)).new
csv = CSV.new(File.read(__DIR__ + "/test_data/mnist_train.csv"))
10000.times do
  # CSV.each_row(File.read(__DIR__ + "/test_data/mnist_train.csv")) do |row|
  csv.next
  new_row = Array(Float64).new
  csv.row.to_a.each { |value| new_row << value.to_f64 }
  raw_data << new_row
end
raw_input_data = Array(Array(Float64)).new
raw_output_data = Array(Array(Float64)).new

raw_data.each do |row|
  raw_input_data << row[1..-1]
  raw_output_data << [row[0]]
end

training_data = SHAInet::CNNData.new(raw_input_data, raw_output_data)
training_data.for_mnist_conv
training_data.data_pairs.shuffle!

# Load test data (partial dataset)
raw_data = Array(Array(Float64)).new
csv = CSV.new(File.read(__DIR__ + "/test_data/mnist_test.csv"))
1000.times do
  csv.next
  new_row = Array(Float64).new
  csv.row.to_a.each { |value| new_row << value.to_f64 }
  raw_data << new_row
end

raw_input_data = Array(Array(Float64)).new
raw_output_data = Array(Array(Float64)).new

raw_data.each do |row|
  raw_input_data << row[1..-1]
  raw_output_data << [row[0]]
end

# Load data to a CNNData helper class
test_data = SHAInet::CNNData.new(raw_input_data, raw_output_data)
test_data.for_mnist_conv # Normalize and make labels into 'one-hot' vectors

# Initialize Covnolutional network
cnn = SHAInet::CNN.new

# Add layers to the model
cnn.add_input([height = 28, width = 28, channels = 1]) # Output shape = 28x28x1
cnn.add_conv(
  filters_num: 20,
  window_size: 5,
  stride: 1,
  padding: 2,
  activation_function: SHAInet.none)  # Output shape = 28x28x20
cnn.add_relu(0.01)                    # Output shape = 28x28x20
cnn.add_maxpool(pool: = 2, stride = 2) # Output shape = 14x14x20
cnn.add_conv(
  filters_num: 20,
  window_size: 5,
  stride: 1,
  padding: 2,
  activation_function: SHAInet.none)  # Output shape = 14x14x40
cnn.add_maxpool(pool:2, stride: 2)    # Output shape = 7x7x40
cnn.add_fconnect(l_size: 10, activation_function: SHAInet.sigmoid)
cnn.add_fconnect(l_size: 10, activation_function: SHAInet.sigmoid)
cnn.add_softmax

cnn.learning_rate = 0.005
cnn.momentum = 0.02

# Train the model on the training-set
cnn.train_batch(
  data: training_data.data_pairs,
  training_type: :sgdm,
  cost_function: :mse,
  epochs: 3,
  error_threshold: 0.0001,
  log_each: 1,
  mini_batch_size: 50)

# Evaluate accuracy on the test-set
correct_answers = 0
test_data.data_pairs.each do |data_point|
  result = cnn.run(data_point[:input], stealth: true)
  if (result.index(result.max) == data_point[:output].index(data_point[:output].max))
    correct_answers += 1
  end
end

# Print the layer activations
cnn.inspect("activations")
puts "We managed #{correct_answers} out of #{test_data.data_pairs.size} total"
puts "Cnn output: #{cnn.output}"

label = {
      "setosa"     => [0.to_f64, 0.to_f64, 1.to_f64],
      "versicolor" => [0.to_f64, 1.to_f64, 0.to_f64],
      "virginica"  => [1.to_f64, 0.to_f64, 0.to_f64],
    }

    iris = SHAInet::Network.new
    iris.add_layer(:input, 4, :memory, SHAInet.sigmoid)
    iris.add_layer(:hidden, 4, :memory, SHAInet.sigmoid)
    iris.add_layer(:output, 3, :memory, SHAInet.sigmoid)
    iris.fully_connect

    # Get data from a local file
    outputs = Array(Array(Float64)).new
    inputs = Array(Array(Float64)).new
    CSV.each_row(File.read(__DIR__ + "/test_data/iris.csv")) do |row|
      row_arr = Array(Float64).new
      row[0..-2].each do |num|
        row_arr << num.to_f64
      end
      inputs << row_arr
      outputs << label[row[-1]]
    end
    data = SHAInet::TrainingData.new(inputs, outputs)
    data.normalize_min_max

    training_data, test_data = data.split(0.9)

    iris.train_es(
      data: training_data,
      pool_size: 50,
      learning_rate: 0.5,
      sigma: 0.1,
      cost_function: :c_ent,
      epochs: 500,
      mini_batch_size: 15,
      error_threshold: 0.00000001,
      log_each: 100,
      show_slice: true)

    # Test the trained model
    correct = 0
    test_data.data.each do |data_point|
      result = iris.run(data_point[0], stealth: true)
      expected = data_point[1]
      # puts "result: \t#{result.map { |x| x.round(5) }}"
      # puts "expected: \t#{expected}"
      error_sum = 0.0
      result.size.times do |i|
        error_sum += (result[i] - expected[i]).abs
      end
      correct += 1 if error_sum < 0.3
    end
    puts "Correct answers: (#{correct} / #{test_data.size})"
    (correct > 10).should eq(true)