thread 'main' panicked at 'assertion failed: `(left == right)`

[flip111]

I get the error message from the title of this issue. It's not very informative what exactly the problem is or how i can fix this. I don't know if this is a problem in my code or in the library code.

Code: https://gist.github.com/flip111/af93e5597df5b35ca45a69d0e3571290

Terminal:

» RUST_BACKTRACE=1 cargo run
   Compiling rust v0.1.0 (/home/flip111/titanic/linear regression/rust)
    Finished dev [unoptimized + debuginfo] target(s) in 2.23s
     Running `target/debug/rust`
thread 'main' panicked at 'assertion failed: `(left == right)`
  left: `891`,
 right: `714`', /home/flip111/.cargo/registry/src/github.com-1ecc6299db9ec823/rulinalg-0.3.7/src/vector.rs:314:9
stack backtrace:
   0: backtrace::backtrace::libunwind::trace
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.37/src/backtrace/libunwind.rs:88
   1: backtrace::backtrace::trace_unsynchronized
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.37/src/backtrace/mod.rs:66
   2: std::sys_common::backtrace::_print_fmt
             at src/libstd/sys_common/backtrace.rs:76
   3: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
             at src/libstd/sys_common/backtrace.rs:60
   4: core::fmt::write
             at src/libcore/fmt/mod.rs:1030
   5: std::io::Write::write_fmt
             at src/libstd/io/mod.rs:1412
   6: std::sys_common::backtrace::_print
             at src/libstd/sys_common/backtrace.rs:64
   7: std::sys_common::backtrace::print
             at src/libstd/sys_common/backtrace.rs:49
   8: std::panicking::default_hook::{{closure}}
             at src/libstd/panicking.rs:196
   9: std::panicking::default_hook
             at src/libstd/panicking.rs:210
  10: std::panicking::rust_panic_with_hook
             at src/libstd/panicking.rs:473
  11: std::panicking::continue_panic_fmt
             at src/libstd/panicking.rs:380
  12: std::panicking::begin_panic_fmt
             at src/libstd/panicking.rs:335
  13: rulinalg::vector::Vector<T>::elemul
             at /home/flip111/.cargo/registry/src/github.com-1ecc6299db9ec823/rusty-machine-0.5.4/<::std::macros::panic macros>:9
  14: <rusty_machine::learning::toolkit::cost_fn::CrossEntropyError as rusty_machine::learning::toolkit::cost_fn::CostFunc<rulinalg::vector::Vector<f64>>>::cost
             at /home/flip111/.cargo/registry/src/github.com-1ecc6299db9ec823/rusty-machine-0.5.4/src/learning/toolkit/cost_fn.rs:87
  15: <rusty_machine::learning::logistic_reg::BaseLogisticRegressor as rusty_machine::learning::optim::Optimizable>::compute_grad
             at /home/flip111/.cargo/registry/src/github.com-1ecc6299db9ec823/rusty-machine-0.5.4/src/learning/logistic_reg.rs:190
  16: <rusty_machine::learning::optim::grad_desc::GradientDesc as rusty_machine::learning::optim::OptimAlgorithm<M>>::optimize
             at /home/flip111/.cargo/registry/src/github.com-1ecc6299db9ec823/rusty-machine-0.5.4/src/learning/optim/grad_desc.rs:83
  17: <rusty_machine::learning::logistic_reg::LogisticRegressor<A> as rusty_machine::learning::SupModel<rulinalg::matrix::Matrix<f64>,rulinalg::vector::Vector<f64>>>::train
             at /home/flip111/.cargo/registry/src/github.com-1ecc6299db9ec823/rusty-machine-0.5.4/src/learning/logistic_reg.rs:122
  18: rust::run
             at src/main.rs:167
  19: rust::main
             at src/main.rs:178
  20: std::rt::lang_start::{{closure}}
             at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/libstd/rt.rs:64
  21: std::rt::lang_start_internal::{{closure}}
             at src/libstd/rt.rs:49
  22: std::panicking::try::do_call
             at src/libstd/panicking.rs:292
  23: __rust_maybe_catch_panic
             at src/libpanic_unwind/lib.rs:80
  24: std::panicking::try
             at src/libstd/panicking.rs:271
  25: std::panic::catch_unwind
             at src/libstd/panic.rs:394
  26: std::rt::lang_start_internal
             at src/libstd/rt.rs:48
  27: std::rt::lang_start
             at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/libstd/rt.rs:64
  28: main
  29: __libc_start_main
  30: _start