Я новичок во встроенных слоях, и у меня с этим проблема. Я пытался подогнать модель нейронной сети, но сначала я закодировал категориальные особенности моего набора данных с помощью слоя Embedding. Вот мой код:
import numpy as np
def preproc(X_train, categorical_vars, other_cols) :
input_list_train = []
for c in categorical_vars :
jjj = np.asarray(X_train[c].tolist())
jjj = pd.factorize( jjj )[0]
input_list_train.append( np.asarray(jjj) )
"""
raw_vals = np.unique(X_train[c])
val_map = {}
for i in range(len(raw_vals)):
val_map[raw_vals[i]] = i
input_list_train.append(X_train[c].map(val_map).values)
"""
#the rest of the columns
input_list_train.append(X_train[other_cols].values)
return input_list_train
X_train = preproc(X_train, categorical_columns, numeric_columns)
X_validation = preproc(X_validation, categorical_columns, numeric_columns)
X_test = preproc(X_test, categorical_columns, numeric_columns)
from keras.layers import *
from keras.models import *
models = []
for categorical_var in categorical_columns:
model = Sequential()
model.reset_states( )
no_of_unique_cat = train_df[categorical_var].nunique()
embedding_size = min(np.ceil((no_of_unique_cat)/2), 50 )
embedding_size = int(embedding_size)
model.add( Embedding( no_of_unique_cat+1, embedding_size, input_length = 1 ) )
model.add(Reshape(target_shape=(embedding_size,)))
models.append( model )
model_rest = Sequential()
model_rest.add(Dense( 64 , input_dim = (train_df.shape[1] - len(categorical_columns)) ))
model_rest.reset_states( )
models.append(model_rest)
layer_nodes = len(X_train) + 1
dropout_hidden_layers = 0.5
output_nodes = 1
full_model = Sequential()
full_model.add(Concatenate(models))
full_model.add(Dense(units = layer_nodes, kernel_initializer = "uniform"))
full_model.add(Activation('relu'))
full_model.add(Dropout(dropout_hidden_layers))
full_model.add(Dense(units = layer_nodes, kernel_initializer = "uniform"))
full_model.add(Activation('relu'))
full_model.add(Dropout(dropout_hidden_layers))
full_model.add(Dense(units = output_nodes, kernel_initializer = "uniform",
activation = "sigmoid"))
full_model.compile(optimizer = "adam", loss = "binary_crossentropy", metrics = ["accuracy"])
history = full_model.fit(X_train, y_train, epochs = 200, batch_size = 20)
Я получил следующую ошибку:
Traceback (most recent call last):
File "<ipython-input-28-d5c2b04c2cc3>", line 51, in <module>
history = full_model.fit(X_train, y_train, epochs = 200, batch_size = 20)
File "/home/javier/anaconda3/lib/python3.7/site-packages/keras/engine/training.py", line 1154, in fit
batch_size=batch_size)
File "/home/javier/anaconda3/lib/python3.7/site-packages/keras/engine/training.py", line 504, in _standardize_user_data
self._set_inputs(x)
File "/home/javier/anaconda3/lib/python3.7/site-packages/keras/engine/training.py", line 414, in _set_inputs
assert len(inputs) == 1
AssertionError
В чем может быть проблема?